Journals >Bulletin of the Chinese Ceramic Society
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2024
Volume: 43 Issue 2
40 Article(s)
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Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 1 (2024)
Experimental Research on Bonding Performance of Interface Between Ultra-High Performance Concrete and Stone
HUANG Wei, HUANG Yaying, CHEN Xueli, WU Yingxiong, ZHENG Xinyan, and ZHANG Hengchun
In the reinforcement and repairmen of existing stone structures by ultra-high performance concrete (UHPC), the excellent bonding performance between UHPC and stone is the key to ensure the reinforcement effect. Therefore, in order to explore the interface bonding performance between UHPC and stone, the effects of diffeIn the reinforcement and repairmen of existing stone structures by ultra-high performance concrete (UHPC), the excellent bonding performance between UHPC and stone is the key to ensure the reinforcement effect. Therefore, in order to explore the interface bonding performance between UHPC and stone, the effects of different interface treatment methods were investigated by splitting tensile test and double L-shaped shear test. The results show that the failure modes of the interface between UHPC and stone are mainly divided into three types. The interface bonding strength is the largest when mode C failure (stone UHPC failure) occurs. The interface groove treatment method significantly improves the interface bonding strength and interface shear stiffness of UHPC-stone specimens. Simultaneously, the interface groove treatment method effectively improves the ductility of specimens while changing the failure mode. When the groove depth is 20 mm, specimens show better interface bonding performance. In addition, the shear load-displacement curve of specimen includes the pre-slip stage and the post-slip stage, and the chisel specimen does not experience plastic deformation in the post-slip stage. Under the same interface treatment method, the interface shear strength between UHPC and stone is positively correlated with the interface splitting tensile strength..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 397 (2024)
Effect of Mineral Admixture on Hydration Behavior and Mechanical Properties of Shotcrete at Different Temperatures
YUAN Jian, WANG Qin, ZENG Fanchao, GUO Zhixiang, and WANG Hongwei
The effects of fly ash, slag and silica fume on hydration behavior and mechanical properties of shotcrete at different temperatures are still unclear. The effects of three mineral admixtures on the hydration behavior of shotcrete at different temperatures and ages were characterized by XRD quantitative analysis, thermoThe effects of fly ash, slag and silica fume on hydration behavior and mechanical properties of shotcrete at different temperatures are still unclear. The effects of three mineral admixtures on the hydration behavior of shotcrete at different temperatures and ages were characterized by XRD quantitative analysis, thermogravimetric analysis and SEM test, and the compressive strength of mortar was tested. The results show that silica fume and slag can improve the early and late strength of shotcrete at different temperatures, while fly ash is not conducive to the development of early strength. The 6 h compressive strength of fly ash mortar is lower than reference value at 20 ℃. At 6 h and 1 d ages, the effect of temperature on the compressive strength of test blocks is very significant, and the 6 h compressive strength of silica mortar at 60 ℃ is as high as 13.39 MPa. With the increase of age, the strengthening effect of temperature on the strength of test block decreases. The increase of temperature stimulates the pozzolana effect of mineral admixture, generates C-S-H gel to fill the internal pores and improve the compressive strength of mortar test block. At the same temperature and age, the content of C-S-H gel in hydration products of silica fume system is high, resulting in the highest compressive strength.The slag system has the highest degree of hydration, resulting in higher compressive strength. Although AFt content of fly ash system is the highest, C-S-H gel content is low, resulting in the lowest compressive strength.This paper provides guidance for the application of mineral admixtures in shotcrete under special environment..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 407 (2024)
Frost Resistance of Marine Concrete Containing Air-Entraining Agent and Its Beam Bending Capacity
LU Chunhua, ZHU Xuewu, PING An, and YANG Yuting
In order to study the effect of air-entraining agent on the frost resistance of marine concrete and its beam bending capacity, a total of 100 rapid freeze-thaw tests were carried out on six marine concrete beams of two mix ratios and the corresponding freeze-damaged test blocks. The mass loss rate, the dynamic elastic In order to study the effect of air-entraining agent on the frost resistance of marine concrete and its beam bending capacity, a total of 100 rapid freeze-thaw tests were carried out on six marine concrete beams of two mix ratios and the corresponding freeze-damaged test blocks. The mass loss rate, the dynamic elastic modulus damage degree and the compressive strength loss rate were used to efficiently evaluate the degree of freeze-thaw damage of concrete. The degradation of the compressive strength of concrete as well as the changes in the coefficients of the equivalent rectangular stress diagrams were considered, and the formula for calculating the bending capacity of normal cross-section of marine concrete beams under freeze-thaw action was proposed. The results show that the addition of air-entraining agent can enhance the frost resistance of marine concrete and slow down the degradation rate of the cracking moment of beams, but the concrete strength and the ultimate moment of beams will be reduced. The proposed model can predict the bending capacity of the cross-section of marine concrete beams under freeze-thaw action better within 150 freeze-thaw cycles..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 418 (2024)
Uniaxial Compressive Damage Comparison of Concrete underSulfate Salt and Dry-Wet Cycles， Freeze-Thaw Cycles
TANG Zixiang, YANG Shuyan, GAO Haihai, and XU Ningyang
In order to study the damage characteristics of concrete under typical service environment in Ningxia, common action and coupled action of three factors, such as sodium sulfate, dry-wet cycle and freeze-thaw cycle were used to investigate different stress-strain curves of concrete uniaxial compressive. Mass loss rate, In order to study the damage characteristics of concrete under typical service environment in Ningxia, common action and coupled action of three factors, such as sodium sulfate, dry-wet cycle and freeze-thaw cycle were used to investigate different stress-strain curves of concrete uniaxial compressive. Mass loss rate, relative dynamic elastic modulus and stress-strain curves of samples under different concentrations of sodium sulfate solution and different corrosion times were measured. The results show that with the increase of corrosion times, the mass loss rate and relative dynamic elastic modulus of coupled action increase first and then decrease, and that of the common action gradually decreases. With the increase of the concentration of sodium sulfate solution, the slopes of upward section of stress-strain curves of samples under the two corrosion systems are gradually decreasing, and the peak stress is gradually decreasing, as a result, the common action deteriorates more than coupled action. With the increase of corrosion times, the slope of rising section of stress-strain curve of specimen under both corrosion regimes decreases gradually, and the peak stress under the coupled action increases first and then decreases, that under the common action gradually decreases. The peak strain under both corrosion systems increases gradually, and the common action deteriorates faster than the coupled action. The prediction models of concrete stress-strain curve under two corrosion systems are established, which can provide a basis for the life prediction of concrete structure under service environment in Ningxia..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 428 (2024)
Prediction Model of Chloride Erosion Concrete Based on Artificial Intelligence Algorithm
CUI Jifei, BAI Lin, RAO Pingping, KANG Chenjunjie, and ZHANG Kun
Some prediction models of chloride ion concentration in concrete of the transmission tower pile foundations were established based on machine learning algorithm. These models were tested through correlation coefficient, root mean square error, mean absolute error and variance ratio， and the robustness of the models werSome prediction models of chloride ion concentration in concrete of the transmission tower pile foundations were established based on machine learning algorithm. These models were tested through correlation coefficient, root mean square error, mean absolute error and variance ratio， and the robustness of the models were analyzed according to Monte Carlo simulation. At the same time, the models were optimized based on sea-horse optimizer. The results show that the support vector machine (SVM) model, the random forest (RF) model and the gradient boosting decision tree (GBDT) model can accurately predict the chloride ion concentration in the concrete of the transmission tower pile foundations. The correlation coefficient R2 is greater than 0.880, the root mean square error is less than 0.009, the mean absolute error is less than 0.006, and the variance ratio is greater than 0.890 for all these prediction models. According to the results of error and robustness analysis, it is recommended to prioritize the use of the GBDT model and SVM model for the prediction of chloride ion concentration in concrete. According to the optimization results, the sea-horse optimizer can significantly improve performance of model..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 439 (2024)
Prediction Model of Impact Splitting Tensile Strength of Concrete after Freeze-Thaw Cycle
XU Ye, TAO Junlin, and LI Hongxiang
In order to predict the impact splitting tensile strength of concrete materials after freeze-thaw cycle, this paper conducted 0, 25, 50, 75 and 100 times freeze-thaw cycle tests on the concrete standard freeze-thaw specimens and the concrete splitting tensile specimens, and tested the dynamic elastic modulus of the conIn order to predict the impact splitting tensile strength of concrete materials after freeze-thaw cycle, this paper conducted 0, 25, 50, 75 and 100 times freeze-thaw cycle tests on the concrete standard freeze-thaw specimens and the concrete splitting tensile specimens, and tested the dynamic elastic modulus of the concrete standard freeze-thaw specimens through the dynamometer. Electro-hydraulic servo universal testing machine and split Hopkinson pressure bar system were used to perform splitting tensile tests at 0.5, 0.5×106, 1.0×106 and 2.0×106 kN/s, respectively. The effects of freeze-thaw damage and force loading rate on impact splitting tensile strength of concrete were analyzed. The results show that the apparent condition, mass and relative dynamic elastic modulus of standard freeze-thaw specimens deteriorate continuously with the increase of freeze-thaw times. When the freeze-thaw times are constant, the impact splitting tensile strength of concrete specimens increases with the increase of force loading rate. On the basis of the above tests, a prediction model of impact splitting tensile strength of concrete after freeze-thaw cycle is established, which can provide a theoretical basis for the prediction of impact splitting tensile strength of concrete after freeze-thaw cycle..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 448 (2024)
Energy Dissipation Characteristics and Damage Pattern Law of Basalt Fiber Concrete under Dynamic Load
WANG Li, and JIANG Shichao
The damage behavior and energy dissipation characteristics of basalt fiber concrete with four different fiber content were investigated under four strain rates based on the split Hopkinson pressure bar test apparatus. The results indicate that with the increase of strain rate, the fractal dimension of concrete with varThe damage behavior and energy dissipation characteristics of basalt fiber concrete with four different fiber content were investigated under four strain rates based on the split Hopkinson pressure bar test apparatus. The results indicate that with the increase of strain rate, the fractal dimension of concrete with varying basalt fiber content linearly increases. The addition of fibers tends to reduce the rate of growth of fractal dimension. The incident energy, reflected energy and dissipated energy of concrete exhibit a linear growth trend, while the transmitted energy shows a slight decrease. With the increase of fiber content, the fractal dimension of basalt fiber concrete increases first and then decreases at different strain rates， and the dissipated energy density follows an "S"-shaped trend, increasing first, decreasing, and then increasing again. As the fractal dimension grows, the dissipated energy density of concrete with different basalt fiber contents linearly increases. The best optimal performance is achieved when the fiber volume fraction is 0.1%, resulting in the maximum tolerance to damage..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 456 (2024)
Multi-Factor Orthogonal Test Analysis of Mechanical Properties and Fluidity of Steel Fiber Sprayed Mortar
PAN Huimin, ZHANG Hao, LI Mengyi, XIE Shaokang, and ZHAO Qingxin
In order to explore the influence of matrix factors on the mechanical properties and fluidity of steel fiber sprayed mortar, the mechanical properties and fluidity of mortar specimens were tested based on orthogonal test method. The results show that the ratio of sand to cement (A) has a great influence on the splittinIn order to explore the influence of matrix factors on the mechanical properties and fluidity of steel fiber sprayed mortar, the mechanical properties and fluidity of mortar specimens were tested based on orthogonal test method. The results show that the ratio of sand to cement (A) has a great influence on the splitting tensile strength, and has a certain influence on 7 d compressive strength, and has a particularly significant effect on later flexural strength. The influence of steel fiber content (B) on splitting tensile strength, early flexural strength and early and middle compressive strength is particularly significant, significant and insignificant, respectively. The content of accelerator (C) has a significant effect on compressive strength before 7 d and the splitting tensile strength in middle and late stages. The content of fly ash (D) has significant influence on compressive strength in late stage. The four factors have no significant influence on fluidity. The optimal mix ratio of compressive strength, flexural strength, splitting tensile strength and fluidity are obtained by analytic hierarchy process as A1B3C3D1, A3B3C1D2, A3B3C3D1, A2B1C1D3, and the optimal mix ratio is obtained by efficiency coefficient method as A2B3C1D2. The steel fiber plays a bridging and anchoring strengthening role in matrix. During the hydration process, the accelerator consumes a large amount of Ca(OH)2 and generates ettringite, which is the main reason for the rapid increase in early strength of sprayed mortar..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 466 (2024)
Effect and Performance of Microbial Healing Technology on Mortar Through Injection Method at Low Temperature
NI Yongjun, LI Wenrong, SONG Weichang, ZHANG Shenghua, LI Jun, TIAN Qian, and GUAN Bowen
To address the issue of reduced growth activity of common microorganisms in low-temperature environments, which leads to a decrease in their ability to repair concrete, the healing effects of mesophilic and cold-resistant bacteria and their combination on the prefabricated crack in mortar specimen were investigated thrTo address the issue of reduced growth activity of common microorganisms in low-temperature environments, which leads to a decrease in their ability to repair concrete, the healing effects of mesophilic and cold-resistant bacteria and their combination on the prefabricated crack in mortar specimen were investigated through injection method and quantitatively evaluated by comparing the flexural and compressive strength of mortar specimens before and after healing. The results show that the healing effect of microorganism on mortar cracks is related to its growth activity at different temperatures. Compared with Sporosarcina pasteuri fwzy14, which can only grow well at room temperature, the cold-resistant Brevibacterium frigoritolerans A779 has the capacity of growing at both room and low temperature, and therefore shows more balanced repairing ability. In addition, A779 can metabolize through both aerobic respiration and nitrate reduction with calcium nitrate as precursor, which enables it to grow inside the crack that is anoxic and repair the crack in depth..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 478 (2024)
Effect of Poplar Fiber on Flowability, Mechanical Property and Auto-Shrinkage of Mortar
ZHU Haohua, YANG Li, LIU Jianhui, and SHI Caijun
The effects of size and volume fraction of poplar fiber on flowability, mechanical properties (compressive strength, flexural strength), and auto-shrinkage of mortar were studied by using control variable method. The results indicate that the volume fraction of poplar fiber has a more significant effect on flowability The effects of size and volume fraction of poplar fiber on flowability, mechanical properties (compressive strength, flexural strength), and auto-shrinkage of mortar were studied by using control variable method. The results indicate that the volume fraction of poplar fiber has a more significant effect on flowability of mortar than its size. When the volume fraction of poplar fiber increases from 1.0% to 3.0%, the flowability of mortar decreases by 49.56%. Increasing the size and volume fraction of poplar fiber reduce the flexural strength of mortar, while increasing the volume fraction of poplar fiber is conducive to improving the compressive strength of mortar. The volume fraction of poplar fiber is more significant than its size on the effect of reducing shrinkage of mortar, and the addition of 3.0% poplar fiber of 0.30~1.25 mm reduces the auto-shrinkage of mortar by 45.6% at 72 h..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 487 (2024)
Carbon Nanocomposite Cement-Based Materials for Geothermal Drilling and Production Based on Response Surface Method
XIANG Jie, WANG Sheng, LI Yujie, and WANG Wenjie
A novel carbon nanocomposite cement-based material for geothermal drilling and production (CNTs-CC) was developed to solve the problem of insufficient performance of existing thermal cementing cement. Firstly, with graphite and silicon nitride as main thermal conductivity filler, silicon powder as heat stabilization maA novel carbon nanocomposite cement-based material for geothermal drilling and production (CNTs-CC) was developed to solve the problem of insufficient performance of existing thermal cementing cement. Firstly, with graphite and silicon nitride as main thermal conductivity filler, silicon powder as heat stabilization material and carbon nanotubes as co-reinforcing filler, the nano composite cement material base liquid was preliminarily developed. Secondly, based on the Box-Behnken experiment design of response surface method, 17-sets of ratio optimization experiments were carried out, and a quadratic polynomial prediction model with 28 d compressive strength and thermal conductivity as the response indexes was constructed. The influences of various factors on the response indexes were investigated by combining analysis of variance and response surface, and the optimal ratio of cementable materials was obtained. Finally, the engineering properties of the cement-based composite materials were evaluated, and the hydration mechanism of the cement-based composite materials was studied by XRD and SEM. The results show that the thermal conductivity and compressive strength of cement-based composite materials are influenced by the interaction of many factors, in which the interaction between early strength agent and water reducing agent is significant. The 28 d compressive strength of CNTs-CC cement stone is 8.15 MPa, and the thermal conductivity is 2.236 W/(m·K). The thermal conductive filler does not participate in the hydration process, and the carbon nanotube powder can play a "filling" and "bridging" effect, and the admixture regulates the hydration process..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 495 (2024)
Preparation of BMIMBr Cement-Based Electrolyte and Its Application in Structural Supercapacitor
LI Jiandong, YANG Zhenying, and DING Yangfei
To improve the ionic conductivity and electrochemical performance, a cement-based composite electrolyte with high ionic conductivity and good mechanical strength was synthesized by using room temperature ionic liquid 1-butyl-3-methylimidazole bromide (BMIMBr) as redox active additive, which can be applied to construct To improve the ionic conductivity and electrochemical performance, a cement-based composite electrolyte with high ionic conductivity and good mechanical strength was synthesized by using room temperature ionic liquid 1-butyl-3-methylimidazole bromide (BMIMBr) as redox active additive, which can be applied to construct structural supercapacitor. The results show that the ionic conductivity of cement-based composite electrolyte containing 20% (mass fraction) BMIMBr reaches the highest value of 35.91 mS·cm-1. BMIMBr can provide Br- which can produce reduction reactions and increase the number of free ions, which is beneficial for ion transport in electrolyte and obtains higher specific capacitance. The structural supercapacitor shows a high specific capacitance of 20.07 F·g-1 at a current density of 0.05 A·g-1. After 1 000 cycles of galvanostatic charge-discharge, the capacitance retention rate reaches 83.6% and coulomb efficiency is 97.56%, demonstrating an excellent cycle lifespan..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 509 (2024)
Research Progress on Preparation and Comprehensive Utilization of Solid Waste Based Calcium Silicate Hydrates
ZHU Yinyuan, ZHU Ganyu, QI Fang, LI Huiquan, CHEN Yan, LI Shaopeng, and GUO Yanxia
Bulk solid waste is a variety of solid waste generated in the process of industrial production, and most of the solid waste contains many silica resources and a variety of valuable resources. Calcium silicate hydrates (C-S-H) is a kind of loose and porous material with strong surface activity, which is widely used in cBulk solid waste is a variety of solid waste generated in the process of industrial production, and most of the solid waste contains many silica resources and a variety of valuable resources. Calcium silicate hydrates (C-S-H) is a kind of loose and porous material with strong surface activity, which is widely used in cement activation, thermal insulation material preparation and heavy metal adsorption, etc. Combining the efficient extraction of valuable resources of bulk solid waste with the efficient utilization of silicon resources to prepare C-S-H is a good way to improve solid waste resources and realize the large-scale utilization of C-S-H materials. Therefore, this paper analyzes the synthesis method, structure and performance characteristics of solid waste C-S-H, discusses the application of C-S-H materials in building materials, environment, chemical industry, biology and other fields, and further prospects its future development direction, so as to provide reference for the utilization of bulk solid waste silicon resources and the controllable preparation of C-S-H materials..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 517 (2024)
Research Progress on Comprehensive Utilization of Phosphogypsum and Its Application in the Field of Building Materials
ZHOU Wu, LI Yang, FENG Weiguang, SU Yi, JIE Weizhe, ZHANG Hua, and NI Hongwei
Phosphogypsum is a byproduct in the wet process of phosphate fertilizer production, with its main phase being CaSO4·2H2O. Despite China being the world’s largest producer of phosphogypsum, its comprehensive utilization rate is below 50%. The accumulated stock has reached 800 million tons, causing severe ecologicalPhosphogypsum is a byproduct in the wet process of phosphate fertilizer production, with its main phase being CaSO4·2H2O. Despite China being the world’s largest producer of phosphogypsum, its comprehensive utilization rate is below 50%. The accumulated stock has reached 800 million tons, causing severe ecological damage. Therefore, exploring effective utilization methods for phosphogypsum is urgently needed. This article analyzes the current research status of the comprehensive utilization of phosphogypsum in various fields. Currently, the utilization rate of phosphogypsum in the chemical industry is only 5%, and in agriculture is a mere 2%, while the building materials sector remains its primary application field. Industrial applications such as using phosphogypsum as a cement retarder, gypsum block, and cement mortar have been industrialized. However, its application in cementitious materials and subgrade materials has not been widely adopted due to concerns about leaching toxicity. The use of phosphogypsum as a filler is still in the experimental exploration phase due to the relatively low strength of material. The paper concludes by envisioning the future trends in the research on environmental friendly utilization of phosphogypsum, aiming to provide references for resolving the stockpile issue of phosphogypsum..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 534 (2024)
Dynamic Mechanical Properties of White Sandstone under Hydrostatic Pressure
LYU Shaopin, ZHENG Guang, ZHENG Yuxuan, NIE Hong, and ZHOU Fenghua
The dynamic mechanical properties of deep rock in high underground stress environment have an important influence on the development of deep mine engineering. Therefore, it is of great significance to study its dynamic mechanics. The effects of hydrostatic pressure on the dynamic mechanical properties, energy absorptioThe dynamic mechanical properties of deep rock in high underground stress environment have an important influence on the development of deep mine engineering. Therefore, it is of great significance to study its dynamic mechanics. The effects of hydrostatic pressure on the dynamic mechanical properties, energy absorption and damage of white sandstone from a coal mine in Pingdingshan were investigated, using 3D Hopkinson bar experiments and finite element simulations based on the Holmquist-Johnson-Cook (HJC) constitutive model. The results show that as the hydrostatic pressure increases, the peak stress of white sandstone increases. Conversely, the peak strain decreases with the increase of hydrostatic pressure. Furthermore, the hydrostatic pressure can restrain the crack propagation and enhance the strength of white sandstone. Additionally, it was found that the HJC constitutive model can simulate the damage failure of white sandstone well. These expected results provide a valuable reference for the study of dynamic mechanical properties of deep rock and a theoretical basis for the implementation of deep rock engineering..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 543 (2024)
Properties of High Toughness Engineered Cementitious Composites with Granite Porphyry Rock Powder
SUN Binqiang, TIAN Maosheng, XIE Chao, LI Yanxiao, and AN Jianmin
High toughness engineered cementitious composites (ECC) have been used in large size plate and beam structures due to their excellent mechanical properties and crack control, but its further application is limited by high cost. The production process of mechanism sand will produce a large amount of rock powder, which wHigh toughness engineered cementitious composites (ECC) have been used in large size plate and beam structures due to their excellent mechanical properties and crack control, but its further application is limited by high cost. The production process of mechanism sand will produce a large amount of rock powder, which will seriously pollute the environment if not handled properly. In order to achieve the dual objectives of reducing the cost of ECC and environmental protection, granitic porphyry rock powder high toughness engineered cementitious composites (GP-ECC) with rock powder instead of river sand was prepared, its properties were studied, and the self-shrinkage prediction model for GP-ECC was established. The results show that the GP-ECC specimens exhibit the characteristics of multi-seam cracking and strain hardening, and compressive strength and flexural strength decrease first and then increase with the increase of granite porphyry rock powder replacement rate, and the best performance is achieved when completely substituted. The 28 d tensile stress peak value reaches 4.4 MPa, the ultimate strain exceedes 4.2%, the compressive strength exceedes 50 MPa, and the flexural strength exceedes 18 MPa. The early self-shrinkage value of GP-ECC increases with the increase of rock powder replacement rate, in which the self-shrinkage value when rock powder completely replaces river sand is 3 133.3 μm/m, which is 117.3% higher than that of the benchmark specimen. So it is necessary to suppress the self-shrinkage of GP-ECC. Meanwhile, the self-shrinkage prediction model proposed in this paper can effectively predict the change of self-shrinkage of GP-ECC. The SEM test results show that the PVA fibers are uniformly dispersed in the granitic porphyry rock powder cement matrix and can work together..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 555 (2024)
Effects of Composition and Content of CFBFA on Hydrated Cementitious Properties
YAN Kezhou, SUN Xiangyang, ZHANG Xinze, WEN Kai, GUO Yanxia, and CHENG Fangqin
The chemical composition of circulating fluidized bed fly ash (CFBFA) are significantly affected its hydrated cementitious properties. Based on the effects of composition and content on the hydrated cementitious properties for CFBFA, it is helpful to further clarify the hydrated cementitious mechanism of CFBFA. The effThe chemical composition of circulating fluidized bed fly ash (CFBFA) are significantly affected its hydrated cementitious properties. Based on the effects of composition and content on the hydrated cementitious properties for CFBFA, it is helpful to further clarify the hydrated cementitious mechanism of CFBFA. The effects of composition and content on the hydrated cementitious mechanical properties, phase composition, micro morphology and elemental distribution for CFBFA were investigated by mechanical properties testing, X-ray diffraction analysis and scanning electron microscopy-energy spectroscopy analysis. The results show that the hydrated cementitious properties are obviously different for CFBFA mortar test block with the different chemical compositions. When the mass contents of aluminum and silicon exceeds 75%, the 28 d compressive strength of CFBFA mortar test block is about 38 MPa. When the mass content of calcium and sulfur exceeds 28%, the 28 d compressive strength of CFBFA mortar test block decreases to about 14.5 MPa. The high content of aluminum and silicon are beneficial to the formation of dense blocks with the large percentage of hydrated calcium silicate, while the high content of calcium and sulfur will result in the appearance of rod-shaped calcium alumina, which is not conducive to the development of mechanical property. In addition, with the increase of cement mass fraction from 50% to 90%, the 28 d compressive strength of CFBFA mortar test block increases by 27.2 MPa. The compressive strength of CFBFA mortar test block is positively correlated with the additional amount of cement in hydrated cementitious system, due to the hydration effect of cement itself and its promoting effect on the reaction of CFBFA. This study can provide a theoretical guidance for the application of CFBFA in the field of construction materials..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 564 (2024)
Effect of Organic Ethanolamine TEA-M-Inorganic Salt System on Activation of FBC
WU Yuanting, WANG Yuanchen, WANG Zhao, LIU Hulin, WANG Wei, REN Siqian, and HUA Chunfeng
The treatment of fluidized bed combustion ash and slag (FBC) and the development of environmentally friendly activator material are the effective way to prevent environmental secondary pollution. An organic ethanolamine TEA-inorganic ethanolamine M-inorganic salt composite activator was developed, and the performance oThe treatment of fluidized bed combustion ash and slag (FBC) and the development of environmentally friendly activator material are the effective way to prevent environmental secondary pollution. An organic ethanolamine TEA-inorganic ethanolamine M-inorganic salt composite activator was developed, and the performance of the material was optimized. And the micromorphology, chemical composition and performance changes of the materials were analyzed by SEM, FTIR, XRD and other characterization methods. The influences of three series of activators, M, TEA-M and TEA-M-inorganic salt on the fluidity ratio and compressive activity index of cement slag were explored. The results show that the grinding effect of TEA improves the particle size. The inorganic activator M can affect the content of Ca(OH)2 participating in hydration reaction. The inorganic salt CaSiO3 may produce more C-S-H in the later stage and provide alkaline condition. The synergistic effect of different materials in the composite activator increases the compressive activity index of cement slag by 29 and 18 percentage points at 7 and 28 d (compared with the blank sample), respectively, while maintaining the fluidity ratio of cement mortar at a high level. This study provides an environmentally friendly activator composite material to promote the green application of FBC..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 572 (2024)
New Method and Effect Verification for Synthesizing Sodalite from Fly Ash Using Solvent-Free Method
GUO Wei, PANG Laixue, WANG Wenchao, ZHANG Jiali, WANG Hua, and BAI Shuxia
Due to its high silicon and aluminum content， low silicon and aluminum ratio, fly ash is often used to synthesize low silicon pure phase sodalite. In order to improve the high-value utilization of fly ash, sodalite was synthesized from fly ash using solvent-free method. The effects of ash-alkali ratio, crystallization Due to its high silicon and aluminum content， low silicon and aluminum ratio, fly ash is often used to synthesize low silicon pure phase sodalite. In order to improve the high-value utilization of fly ash, sodalite was synthesized from fly ash using solvent-free method. The effects of ash-alkali ratio, crystallization time and crystallization temperature on sodalite phase formation, microstructure and crystallinity were studied. The results show that crystaline pristine sodalite is prepared from fly ash with ash-alkali ratio of 1∶0.8 (mass ratio), crystallization time of 16 h and crystallization temperature of 160 ℃. The ash-alkali ratio has a significant effect on relative crystallinity. The synthesized sodalite has microporous and mesoporous composite pore structure. The N2 adsorption-desorption isotherm of sodalite isotherm reveals a typical IV isotherm with a type III hysteresis loop. Sodalite has high aluminum content， and has good thermal stability. Compared with the hydrothermal method for synthesizing sodalite, this experimental method utilizes fly ash with high efficiency， and provides a new way for the utilization of fly ash..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 584 (2024)
Flexural Performance of PVA-Iron Ore Tailings Concrete
ZHU Lishuai, XIE Qun, HUI Jing, ZHAO Peng, and LI Junfeng
In order to achieve the recycling and utilization of solid waste, iron ore tailings were partially replaced with fine aggregates and added with PVA fibers to prepare PVA-iron ore tailings concrete with good workability. The influences of different iron ore tailings replacement rates and PVA fiber content on the flexuraIn order to achieve the recycling and utilization of solid waste, iron ore tailings were partially replaced with fine aggregates and added with PVA fibers to prepare PVA-iron ore tailings concrete with good workability. The influences of different iron ore tailings replacement rates and PVA fiber content on the flexural performance of concrete were studied through standard flexural tests. The result show that when the PVA fiber content is 0% and 0.1% (mass fraction, the same below), the specimens undergo through type brittle cracking failure. When the PVA fiber content is 0.2% and 0.3%, the crack width of specimens significantly decreases and does not penetrate. When the iron ore tailings replacement rate is 30% and the PVA content is 0.3%, the mid-span and flexural strength of specimen reach their maximum values, which has increased by 22.04% and 6.57% compared to ordinary concrete, respectively. When iron ore tailings replacement rate exceeds 30%, the flexural strength and deflection will significantly decrease. Compared to the single addition of PVA fiber, the deformation ability of specimens mixed with PVA fiber and iron ore tailings is more significantly enhanced. It can be seen from the XRD pattern that the C-S-H gel and ettringite are the most abundant under the 30% iron ore tailings replacement rate, which can significantly improve the strength of material..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 593 (2024)
Formula Design and Mechanical Properties of Three Kinds of Modified Raw Soil Materials Mixed with Solid Waste
ZHANG Kun, FU Zhiyong, ZHANG Linghan, YANG Wenhao, LAN Guanqi, and ZHU Xiyu
In order to improve the mechanical properties of raw soil materials, iron tailings, gangue, calcium carbide slag, oil sludge and cement were used as admixtures to modify raw soil. On the basis of the monomorphic lattice method, the effects of different factors on the failure morphology, compressive strength and data diIn order to improve the mechanical properties of raw soil materials, iron tailings, gangue, calcium carbide slag, oil sludge and cement were used as admixtures to modify raw soil. On the basis of the monomorphic lattice method, the effects of different factors on the failure morphology, compressive strength and data discreteness of the specimen were studied through compressive test of 180 modified raw soil specimens of three modified formulas. Using the frequency analysis method, the optimal formula of solid waste modified raw soil material was studied. Then, the fractal and pore structures inside the loaded material were analyzed at a microscopic level through CT scanning. The results show that the compressive failure forms of different admixture-modified raw soil specimens are basically the same, but the admixture significantly affects the limit displacement. Gangue and calcium carbide slag, iron tailings and cement, oil sludge and cement as raw soil admixtures can greatly improve the mechanical properties of modified raw soil specimens, the type and the amount of admixture have a significant impact on the strength and data discreteness of modified raw soil specimens. After frequency optimization, the ideal strength admixture ratios for the three formulas are 1) iron tailings 12.1%~19.5% (mass fraction, the same below), cement 13.9%~19.1% and raw soil 65.5%~69.9%; 2) calcium carbide slag 6.7%~14.1%, coal gangue 8.9%~11.8% and raw soil 76.7%~81.8%; 3) oil sludge 11.4%~14.4%, cement 17.4%~19.4% and raw soil 67.1%~70.5%. The fractal and pore characteristics inside the material are stable, exhibiting small fluctuations and good compactness..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 603 (2024)
Mechanical Property and Resistance to Water Dispersion of Solid Waste Shield Inert Synchronous Grouting Materials
HONG Qiaoheng, HE Xiongfei, ZHANG Minglang, TANG Gang, and HUANG Wei
As typical solid wastes, slag powder, fly ash and silica fume were used as raw materials to fabricate solid waste shield inert synchronous grouting materials. The mechanical property and resistance to water dispersion of grouting materials were investigated by using six-factor and five-level orthogonal test. The resultAs typical solid wastes, slag powder, fly ash and silica fume were used as raw materials to fabricate solid waste shield inert synchronous grouting materials. The mechanical property and resistance to water dispersion of grouting materials were investigated by using six-factor and five-level orthogonal test. The results show that the compressive strength of slurry decreases with the increase of alkali activator modulus and the decrease of dosage. The water-binder ratio and bentonite-water ratio exhibit great influence on the hydrodynamic erosion resistance of slurry. The dosage of alkali activator and the water-binder ratio are the main factors affecting the water land strength ratio of slurry. According to the range analysis of orthogonal test and comprehensive performance balance, the optimal mix ratio of grouting material is determined as follows： water-binder ratio 1.00, binder-sand ratio 0.45, bentonite-water ratio 0.35, dosage of water reducer 1.5% （mass fraction）, alkali activator modulus 1.6, dosage of alkali activator 20% （mass fraction）, and grouting material exhibits compressive strength (28 d) of 13.02 MPa, water land strength ratio of 80.83% and hydrodynamic erosion mass loss rate (3 h) of 5.62%. Furthermore, performance tests such as consistency, setting time, bleeding rate and stone rate were conducted, and the indexes all met the requirements of active slurry. The above research provides a certain research and experimental basis for the application of industrial solid wastes in the field of shield grouting technology..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 617 (2024)
Hydration Properties of Metakaolin Composite Grouting Materials for Anti-Seepage of Grottoes Rock Fissures
CHEN Jiaqi, WANG Jinhua, YAN Shaojun, TIAN Yechenxi, DU Zhiyan, JIANG Shu, and HUO Xiaotong
Metakaolin composite grouting material is an inorganic grouting material mixed with a large proportion of metakaolin in cement, which is used for anti-seepage grouting engineering of rock fissures in grottoes. In this paper, the hydration and product characterization of binary and ternary metakaolin composite grouting Metakaolin composite grouting material is an inorganic grouting material mixed with a large proportion of metakaolin in cement, which is used for anti-seepage grouting engineering of rock fissures in grottoes. In this paper, the hydration and product characterization of binary and ternary metakaolin composite grouting material were studied by means of hydration heat, XRD, FTIR, and SEM-EDX test. The feasibility of applying this material to grotto fissure grouting was analyzed by mechanical properties and water-solube salt test. The results indicate that the reaction degree of cement materials with is low. But the dilution effect and pozzolanic reaction of metakaolin and the charge compensation effect of active Al have a significant advantage in reducing the salt and alkali content in leaching solution. The addition of silica fume can enhance the hydration degree and mechanical strength of ternary composite grouting material. However, the decrease in Al/Si of hydrated products is not conducive to the adsorption of K+ and Na+. The metakaolin composite grouting material is a safer material than ordinary Portland cement in grotto protection, and it exhibits better compatibility with grottoes environment. Additionally, metakaolin, as a supplementary cementitious material, has more advantages over silica fume in reducing K+ and Na+ leaching..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 627 (2024)
Research Progress of Porous Ceramic Insulation Material
WANG Mengmeng, SUI Xueye, QI Kaiyu, XU Jie, LIU Ruixiang, ZHOU Changling, TANG Wenzhe, DUAN Xiaofeng, and LI Zhanfeng
Porous ceramics have a large number of interconnected or closed pores. Microstructural characteristics such as pore size, pore distribution and connectivity, play a crucial role in physical properties of material. In this paper, we present the remarkable properties and broad application prospects of porous ceramic insuPorous ceramics have a large number of interconnected or closed pores. Microstructural characteristics such as pore size, pore distribution and connectivity, play a crucial role in physical properties of material. In this paper, we present the remarkable properties and broad application prospects of porous ceramic insulation materials, including applications in aerospace, construction, industrial energy efficiency, biomedical (for bone defect repair materials), ceramic electrochemical devices in batteries, catalyst carriers (for exhaust gas purification in gasoline engines), and various other fields such as sound insulation, liquid separation, and sensors. It also summarizes the preparation methods and research progress of porous ceramic thermal insulation materials in recent years. The content mainly covers the selection of raw materials, technological methods, and key material properties. Finally, it outlines the current development status and common challenges faced by porous ceramic materials, along with suggesting strategies for improvement, aiming to provide references for the development of more high-performance porous ceramic thermal insulation materials in the future..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 637 (2024)
Research Progress of Barium Titanate and Potassium Sodium Niobate Lead-Free Piezoelectric Ceramics
XU Minghao, HUA Kaihui, ZENG Qun, DI Bo, ZHENG Yu, WANG Hongxiang, and ZHANG Guoxiang
Barium titanate (BaTiO3) and potassium sodium niobate (K0.5Na0.5NbO3) piezoelectric ceramics have become the forefront of international high-tech materials research due to their environmental friendliness, excellent electrical properties and proper curie temperature, and were expected to replace some lead-based piezoelBarium titanate (BaTiO3) and potassium sodium niobate (K0.5Na0.5NbO3) piezoelectric ceramics have become the forefront of international high-tech materials research due to their environmental friendliness, excellent electrical properties and proper curie temperature, and were expected to replace some lead-based piezoelectric ceramics in electronic devices in the fields of national defense, aerospace and communications, etc. In this paper, the latest research progress of BaTiO3 and K0.5Na0.5NbO3 piezoelectric ceramic materials was reviewed, the aspect of constructing phase boundary to regulate the piezoelectric performance, designing the material system of BaTiO3-based piezoelectric ceramics, the thermal stability and improvement of K0.5Na0.5NbO3-based piezoelectric ceramics and the new molding and sintering process of piezoelectric ceramics were analyzed and summarized objectively. Finally, future development trend of the two kinds of materials was discussed, and a reference for the development of high-performance lead-free piezoelectric ceramics was provided..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 649 (2024)
Thermal Shock Resistance of AlN/YAlO3 Composite Ceramics
LYU Xuming, ZHANG Yunhan, SHI Guohua, WANG Jiawei, and SUN Xiaohong
AlN ceramics have high hardness and brittleness, and it is difficult to be sintered and dense. As a smelting vessel, it is damaged by high-temperature deformation or thermal shock caused by temperature change. AlN/YAlO3 composite ceramics were prepared by pressureless sintering method by adding YAlO3 as a particle reinAlN ceramics have high hardness and brittleness, and it is difficult to be sintered and dense. As a smelting vessel, it is damaged by high-temperature deformation or thermal shock caused by temperature change. AlN/YAlO3 composite ceramics were prepared by pressureless sintering method by adding YAlO3 as a particle reinforcement phase, and the thermal shock resistance of AlN/YAlO3 composite ceramics at different temperatures was investigated. The phase structure, fracture morphology, and surface morphology of AlN/YAlO3 composite ceramics before and after thermal shock were analyzed, and the mechanism of thermal shock damage was elucidated. The results show that the addition of YAlO3 can promote the sintering and increase the density to 98.37% of AlN ceramics. The flexural strength and thermal shock resistance of AlN/YAlO3 composite ceramics are improved due to the grain refinement. Especially in thermal shock experiments at higher temperatures, when the thermal shock temperature rises to 600 ℃, the flexural strength and residual strength ratio of AlN/YAlO3 composite ceramics are significantly higher than those of AlN ceramics, indicating that the addition of YAlO3 can effectively improve the thermal shock resistance of AlN ceramics. It is mainly attributable to microcrack toughening, crack deection and branching behavior slow down the reduction of flexural strength of AlN/YAlO3 composite ceramics. Moreover, when the thermal shock temperature reaches 1 000 ℃, Al2O3 oxidated by AlN reduces severely the flexural strength of AlN/YAlO3 composite ceramics..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 659 (2024)
Analysis of Influencing Factors on Dielectric Properties of Fused Quartz Ceramics
CUI Tangyin, WANG Peng, LIU Ruixiang, WANG Hongsheng, CAO Junchang, and CHEN Dongjie
Fused silica ceramics were prepared by gel-casting molding process. The crystal structure, micro-morphology and dielectric properties of ceramic samples were analyzed by XRD, SEM and electrical network analyzer, and the influencing factors on dielectric properties of fused silica ceramics were studied to provide basis Fused silica ceramics were prepared by gel-casting molding process. The crystal structure, micro-morphology and dielectric properties of ceramic samples were analyzed by XRD, SEM and electrical network analyzer, and the influencing factors on dielectric properties of fused silica ceramics were studied to provide basis for screening the optimal preparation technology of fused silica ceramics. The results show that quartz ceramic slabs of different thicknesses are prepared and sintered horizontally with certain material preparation, the density of the same square slab decreases from top to bottom along the vertical direction, and the density has a positive correlation with the dielectric constant, for every 0.01 g/cm3 increase in density, the dielectric constant increases by 0.01~0.02. And the density has little effect on the tangent value of the loss angle. For the same slab of the same thickness, the density of the edge and the middle position barely unchanged. For the same slab and the same thickness direction, the dielectric constant does not change much. The rosin in the quartz ceramic slab makes the sample denser and the dielectric constant increases with the increase of the density, the calculated permittivity has a deviation of about 0.03..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 666 (2024)
Preparation and Performance of Gas Reservoir Ceramic Proppant with Low Density
XING Li, SUN Xiaosi, BAI Pinbo, WANG Kaiyue, and TIAN Yuming
In the process of extracting coalbed methane, shale gas and other gas reservoir resources, the product performance of ceramic proppants is particularly crucial. Low synthetic density and high strength of proppant are important indicators for achieving high gas reservoir productivity. On the basis of traditional ceramicIn the process of extracting coalbed methane, shale gas and other gas reservoir resources, the product performance of ceramic proppants is particularly crucial. Low synthetic density and high strength of proppant are important indicators for achieving high gas reservoir productivity. On the basis of traditional ceramic proppants, by adding raw coal gangue (RCG), sodium carboxymethyl cellulose (CMC), and dolomite (DOL) for solid state sintering, the matrix pore distribution characteristics of the proppants were improved, the structural density of the proppants was reduced, and the matrix strength was enhanced, with the help of the multi temperature pyrolysis effect of the pore forming agents and the high-temperature liquid phase rapid filling mechanism. When a mass fraction of 15%RCG+1%CMC+1%DOL additive is added, the proppant exhibits the best comprehensive performance and meets the parameter requirements for gas reservoir resource extraction..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 673 (2024)
Review of Structural Relaxation and Influencing Factors of Inorganic Glass
LI Jingwei, LI Jingchao, ZHENG Ruipeng, and WANG Chen
In this paper, the fictive temperature and relaxation dynamics theories of structural relaxation are introduced at first, and their establishment, development and research progress are discussed as well. The fictive temperature theory focuses on the thermal history of glass, and provides a thermodynamic criterion for dIn this paper, the fictive temperature and relaxation dynamics theories of structural relaxation are introduced at first, and their establishment, development and research progress are discussed as well. The fictive temperature theory focuses on the thermal history of glass, and provides a thermodynamic criterion for determining the direction and velocity of relaxation process, while the relaxation dynamics theory places emphasis on glass transition phenomenon and aims to reveal microscopic mechanism and evolution process of structural relaxation. The thermal history, glass composition, impurities, defects, temperature, stress, moisture and size are key factors affecting the structural of inorganic glass. These factors are important issues of structure tailoring and safety analysis for manufacture and application of glass. Although the structural relaxation theories of glass have been rapidly developed, there are still many gaps in experimental studies, particularly for inorganic glass with complex composition, and the specific microscopic mechanism still needs further improvement. In addition, the structural relaxation of glass-ceramics and glass matrix composites has not received deserved attention. The breakthrough of such problems is expected to support long-term safety and reliability of inorganic glass under more stringent conditions..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 682 (2024)
Effect of Melt-Pressing Temperature on Bending Strength of Fiber Optic Plate
SUN Yong, ZHAO Jinkai, HUANG Yonggang, WANG Wei, WANG Caili, KONG Zhuang, SONG Puguang, and MENG Fanyu
Fiber optic plate is widely used in fields such as low-light level night vision, space detection, nuclear diagnosis, medical diagnosis and treatment, and has certain requirements for strength in application. However, there is currently a lack of relevant research. In this paper, the effect of melt-pressing temperature Fiber optic plate is widely used in fields such as low-light level night vision, space detection, nuclear diagnosis, medical diagnosis and treatment, and has certain requirements for strength in application. However, there is currently a lack of relevant research. In this paper, the effect of melt-pressing temperature on the bending strength of fiber optic plate in x, y, and z directions by three point bengding method was studied. When the melt-pressing temperature is 660 ℃, the secondary multi-fiber fusion is insufficient, leading to gaps. The bending strength of fiber optic plate is low, with values in x, y and z directions of 107, 93 and 114 MPa, respectively. As the melt-pressing temperature increases, the gap between the secondary multi-fiber disappears at 670 ℃, but there is still an interface, and the bending strength is improved, with values in x, y and z directions of 110, 109 and 125 MPa, respectively. At the melt-pressing temperature of 680 ℃, the secondary multi-fiber is fully fused, and the bending strength of fiber optic plate meets the rule of mixture of composite in x and z directions, which is 123 and 127 MPa, respectively. Meanwhile, the core glass in y direction plays a reinforcing role to the cladding glass, and the bending strength is 113 MPa. This study is of great significance in improving the strength of fiber optic plate to meet the requirements of installation and use..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 695 (2024)
Effect of n(Bi2O3)/n(SiO2) on Microstructure and Reflectivity of Bi2O3-B2O3-SiO2 System Photovoltaic Glass Backplane Inks
WANG Wei, ZHAO Tiangui, MENG Zihao, LIU Li, DONG Weixia, XU Heliang, and BAO Qifu
With the rise of passivated emitter and rear cell double-sided glass components industries，the need for photovoltaic ink for photovoltaic glass backsheet is growing annually. After the photovoltaic ink is prepared for the coating, the degree of its density will have a direct impact on the reflectivity of photovoltaic iWith the rise of passivated emitter and rear cell double-sided glass components industries，the need for photovoltaic ink for photovoltaic glass backsheet is growing annually. After the photovoltaic ink is prepared for the coating, the degree of its density will have a direct impact on the reflectivity of photovoltaic ink coating and conversion efficiency ulteriorly of photovoltaic cell. By changing the n(Bi2O3)/n(SiO2), the crystallization of glass flux and its effect on the photovoltaic ink prepared by Bi2O3-B2O3-SiO2 glass flux were investigated. The different characteristics of glass flux were analyzed by using DSC and Raman. The microstructure and reflectance of various photovoltaic ink coating were studied by using XRD and SEM, and the mechanism for the enhancement of light reflection was proposed. The results show that the increase of n(Bi2O3)/n(SiO2) leads to an increase in ［BiO3］ and ［BiO6］ ionic groups. Thus, the destruction ability of the ［SiO4］ glass network is enhanced, and the transition temperature and crystallization peak temperature of glass flux gradually decrease. The crystallization ability of glass flux gradually increases. A large number of flaky Bi2SiO5 crystals are gradually precipitated from photovoltaic ink coating in a short period of time. After preparing them as photovoltaic ink coating, the reflectivity of the coating gradually increases with the elevation of n(Bi2O3)/n(SiO2). With n(Bi2O3)/n(SiO2) of 30∶60, the reflectance of photovoltaic ink coating can be enhanced to 82.66% in the near-infrared wavelength range. This is mainly due to the fact that the pores and cavities in photovoltaic ink coating act as heterogeneous interfaces, prompting the precipitation of Bi2SiO5 crystals and filling them into the pores and cavities of photovoltaic ink coating, resulting in an increase in the densification of photovoltaic ink coating and thus an enhancement of the reflective ability of photovoltaic ink coating to light..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 702 (2024)
Effect of Composition on Crystallization Properties of Yttrium Zirconate Nanocrystals in Sodium-Aluminum-Silicate Glass
TIAN Yingliang, HAN Jinlong, XU Bo, WEN Yulin, LI Peihao, HE Feng, and ZHAO Zhiyong
The influences of the molar ratios of Al2O3/Na2O (MAN) and SiO2/Al2O3 (MSA)on the crystallization properties of the glass were studied in this work based on the sodium-aluminum-silicate glass system containing Y2O3 and ZrO2. The results show that, when MAN1, yttrium zirconate nanocrystals can be formed in the whole bulThe influences of the molar ratios of Al2O3/Na2O (MAN) and SiO2/Al2O3 (MSA)on the crystallization properties of the glass were studied in this work based on the sodium-aluminum-silicate glass system containing Y2O3 and ZrO2. The results show that, when MAN<1, sodium nepheline crystals precipitate on the surface of the glass after heat treatment. When MAN>1, yttrium zirconate nanocrystals can be formed in the whole bulk glass, and the glass-ceramics can maintain a high visible light transmittance of 90%. For glass with fixed MAN, adjusting its MSA can also achieve the precipitation of yttrium zirconate nanocrystals, and the size of the precipitated crystals decreases as MSA increases. Furthermore, as the heat treatment temperature rises, the size of nanocrystals in glass-ceramic nanocrystals as well as Vickers hardness increases..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 710 (2024)
Effect of MgCl2·6H2O Solution on Properties of Periclase-Magnesia Alumina Spinel Refractories
WANG Xin, HAN Bingqiang, MIAO Zheng, CHEN Junfeng, and YAN Wen
Fused magnesia and fused magnesia alumina spinel were used as raw materials to prepare periclase-magnesia alumina spinel refractories, with three different concentrations of MgCl2·6H2O solution at 18 °Be′, 24 °Be′ and 30 °Be′ and phenolic resin as bonding agent. The effect of MgCl2·6H2O solutioFused magnesia and fused magnesia alumina spinel were used as raw materials to prepare periclase-magnesia alumina spinel refractories, with three different concentrations of MgCl2·6H2O solution at 18 °Be′, 24 °Be′ and 30 °Be′ and phenolic resin as bonding agent. The effect of MgCl2·6H2O solution on cold modulus of rupture, cold crushing strength, sintering properties and thermal shock resistance of refractories was investigated by using phenolic resin as control group. The mechanisms of MgCl2·6H2O solution action on refractories were elucidated. The results show that MgCl2·6H2O solution reacts with magnesia to generate magnesium oxychloride cement (MOC) at room temperature, and the microstructure of MOC is interwoven interlocked whiskers, which makes the refractories show supervise mechanical strength after drying. The cold crushing strength of refractories reaches 79.1 MPa when the fire temperature is 1 700 ℃ and the solution concentration is 24 °Be′，which is 58.2% higher than that of phenolic resin. The apparent porosity of refractories reduces to 16.8% when the firing temperature is 1 700 ℃ and the solution concentration is 18 °Be′, which is 13.4% lower than that of phenolic resin. The increase of MgCl2·6H2O solution concentration is beneficial to improve fracture toughness of material. MOC and Mg(OH)2 decompose to produce reactive MgO during firing process, which promotes the sintering of refractories. In addition, the quasi-spherical MgO produced by decomposition disperses and fills in the internal cracks of magnesia particles, forming a microporous structure inside refractories, which is conducive to mitigating thermal stress impact during thermal shock..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 719 (2024)
Preparation of CdS Nanospheres on Titanium Meshes with Photocatalytic H2 Evolution under Visible Light
CHEN Zhiqiang, CUI Lei, DONG Jing, LI Haixia, and XIA Weiwei
It is an interesting topic to improve the photocatalytic H2 evolution activities of catalysts. In this parper, CdS nanospheres on titanium meshes have been synthesized by a simple hydrothermal method. The composition, microstructure and morphology of samples were investigated using X-ray diffractometer (XRD), scan elecIt is an interesting topic to improve the photocatalytic H2 evolution activities of catalysts. In this parper, CdS nanospheres on titanium meshes have been synthesized by a simple hydrothermal method. The composition, microstructure and morphology of samples were investigated using X-ray diffractometer (XRD), scan electron microscopy (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). And the photoelectrochemical properties and photocatalytic properties under visible light were studied. The results show that, each CdS nanosphere on titanium meshes is self-assembled with nanorods. Then, the samples were used as photoelectrochemical photoanodes and photocatalytic water-splitting processes, the sample with a Cd/S amount of substance ratio of 1∶1 (CdS-1) has a good photoelectric response, and has a maximal photocurrent of ~140 μA. At the same time, the results show that the sample has a good H2 evolution activity with the rate of 212.6 μmol·h-1·cm-2 and recycling convenient, reusable, which can be an ideal photocatalyst..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 727 (2024)
Preparation of NiMgAl-Hydrotalcite and Its Inhibition Property on Water Eutrophication
ZHOU Liangqin, WANG Rong, FAN Jinlong, WANG Jiani, XU Tengfei, TAN Wenyuan, and FU Dayou
The discharge of wastewater containing phosphorus will lead to eutrophication and threaten ecological environment. In this article, a kind of NiMgAl-HTLC was synthesized by orthogonal experiment, which was used to remove phosphorus from wastewater. The properties of materials were characterized by SEM, EDS, TEM, XPS anThe discharge of wastewater containing phosphorus will lead to eutrophication and threaten ecological environment. In this article, a kind of NiMgAl-HTLC was synthesized by orthogonal experiment, which was used to remove phosphorus from wastewater. The properties of materials were characterized by SEM, EDS, TEM, XPS and BET. The adsorption mechanism was revealed by studying thermodynamics, kinetics and influencing factors in adsorption process. Finally, in order to evaluate the inhibition ability of NiMgAl-HTLC on water eutrophication, duckweed was cultured by wastewater after phosphorus removal. The results show that the optimum preparation conditions of NiMgAl-HTLC are as follows: the molar ratio of metal ions (Ni∶Mg∶Al) is 3∶1∶3, the dosage of urea solution is 20 mL, the reaction time is 10 h, and temperature is 150 ℃. The thickness of NiMgAl-HTLC nanosheets is about 10 nm, and the specific surface area is 84.98 m2·g-1. The maximum phosphorus adsorption capacity of NiMgAl-HTLC is 61.162 1 mg·g-1, and the adsorption process conforms to second-order kinetics and Langmuir thermodynamic model. The reproduction rate of duckweed in wastewater after phosphorus removal is slower significantly, indicating that NiMgAl-HTLC possess obvious inhibition on water eutrophication..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 734 (2024)
Road Performances and Mechanical Properties of Multi-Gravel Polyurethane Concrete
SUN Min, HOU Derui, GENG Litao, YAN Zhuoran, BI Yufeng, HUANG Zhaoliang, REN Shuaiyu, and WANG Benyi
To investigate the road performance and mechanical properties of polyurethane mixture with dense skeleton structure, the design theory of multi-gravel asphalt concrete was used to design the composition of polyurethane concrete. A variety of performance tests were carried out to evaluate the road performance of multi-gTo investigate the road performance and mechanical properties of polyurethane mixture with dense skeleton structure, the design theory of multi-gravel asphalt concrete was used to design the composition of polyurethane concrete. A variety of performance tests were carried out to evaluate the road performance of multi-gravel polyurethane concrete, and the mechanical properties were evaluated based on uniaxial penetration test, uniaxial compressive test and uniaxial tensile test. The results show that the dynamic stability of multi-gravel polyurethane concrete is 53.4 times and 17.8 times that of matrix asphalt mixture and asphalt mastic gravel mixture. The maximum bending strain at low temperature is 2.26 times and 1.95 times respectively, and the fatigue life is 26.0 times and 12.7 times， respectively. In terms of mechanical properties, temperature has little effect on the uniaxial penetration strength and penetration amount of multi-gravel polyurethane concrete. The compressive and tensile elastic modulus of multi-gravel polyurethane concrete are much smaller than that of cement concrete, but larger than that of asphalt mastic gravel concrete. Multi-gravel polyurethane concrete has excellent road performance. Temperature has little effect on the shear mechanical properties of multi-gravel polyurethane concrete. The multi-uniaxial tensile and compressive mechanical properties are between asphalt mixture and cement concrete, which can be applied to pavement structure paving..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 746 (2024)
Effect of Excitation Stirring on Compressive Strength of Cement Stabilized Crushed Stone and Coal Gangue
WANG Jiliang, GUO Wenbin, SONG Qingkai, XU Weidong, and LIU Peng
In order to study the influence of excitation stirring process on the performance of cement stabilized coal gangue mixture, based on cement stabilized crushed stone, the effects of conventional stirring and excitation stirring on the unconfined compressive strength of cement stabilized base materials with different cemIn order to study the influence of excitation stirring process on the performance of cement stabilized coal gangue mixture, based on cement stabilized crushed stone, the effects of conventional stirring and excitation stirring on the unconfined compressive strength of cement stabilized base materials with different cement dosages were compared and analyzed. The results show that increasing the excitation stirring in the dry mixing state has a significant effect on the compressive strength of the base mixture. The 7 d unconfined compressive strength of the mixture reaches the best under the conditions of 0.4 MPa air pressure, 30 s of vibration dry mixing and 30 s of ordinary wet mixing. The average increase of the strength of cement stabilized crushed stone and cement stabilized coal gangue mixture is about 20%, the strength improvement of coal gangue mixture is more significant, and the less the cement dosage, the greater the increase. The SEM results show that the distribution of hydration products in the mixture is more uniform and the structure is more compact after the excitation stirring. According to the linear fitting calculation, when the cement dosage is 2.0%～7.0% (mass fraction， the same bellow), the vibration mixing can save 8.9%～26.3% cement for the gravel mixture and 12.9%～30.8% cement for the coal gangue mixture. And the saving rate is inversely proportional to the cement dosage..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 757 (2024)
Pavement Performance of Industrial Solid Waste Phosphogypsum Pavement Base Material
ZONG Wei, WANG Yuanhui, XU Liang, LIU Cheng, and ZHENG Wuxi
In order to promote the large-scale utilization of phosphogypsum in highway engineering, the comprehensive road performance of phosphogypsum pavement base material was evaluated by typical mechanical test, bubble swelling test, shrinkage test, freeze-thaw cycle test, delayed formation test and low temperature natural cIn order to promote the large-scale utilization of phosphogypsum in highway engineering, the comprehensive road performance of phosphogypsum pavement base material was evaluated by typical mechanical test, bubble swelling test, shrinkage test, freeze-thaw cycle test, delayed formation test and low temperature natural curing test. The results show that the mechanical properties of phosphogypsum pavement base material are comparable to those of ordinary cement stabilized crushed stone. The 28 d cumulative expansion rate is only 0.086%, indicating good water stability. The dry shrinkage coefficient is 116.64 με/%, the temperature shrinkage coefficient is 5.15 με/℃, and the compressive strength ratio after freeze-thaw cycles is 81.13%, demonstrating significant shrinkage resistance and frost resistance. Both the delayed formation time and low-temperature curing have adverse effects on the strength of mixture, with a 24% strength decrease after 4 h delay and 33% strength decrease under 5 ℃ curing condition..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 766 (2024)
Mechanical Properties and Frost Resistance of Cement Stabilized Recycled Aggregate Mixture
SHAN She, GUO Haizhen, WEI Dingbang, LIU Hui, RUAN Zhiqi, and REN Guobin
In order to promote the application of recycled aggregate in semi rigid base layers and achieve the resource utilization of construction waste in highway engineering， this article uses equal mass replacement method to systematically analyze the effect of recycled aggregate content (mass fraction) at 0%, 30%, 50%, 70%, In order to promote the application of recycled aggregate in semi rigid base layers and achieve the resource utilization of construction waste in highway engineering， this article uses equal mass replacement method to systematically analyze the effect of recycled aggregate content (mass fraction) at 0%, 30%, 50%, 70%, and 100% on maximum dry density, optimal moisture content, unconfined compressive strength, and frost resistance of inorganic mixtures, and explains its internal influencing mechanism from a microscopic perspective. The results show that the addition of recycled aggregate reduces the maximum dry density of inorganic mixtures and increases the optimal moisture content. Recycled aggregate can effectively improve the unconfined compressive strength and frost resistance of inorganic mixtures. The best effect is achieved when recycled aggregate content is 70%. At this moment, the unconfined compressive strength of recycled aggregate inorganic mixtures is 4.6 and 6.8 MPa after 7 and 28 d, and the residual compressive strength ratio after 28 and 90 d of freeze-thaw cycles can reach 82.4% and 85.5%..
Bulletin of the Chinese Ceramic Society
- Publication Date: Aug. 05, 2024
- Vol. 43, Issue 2, 774 (2024)
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