Physical and Mechanical Properties of SiO2 Aerogel Modified Geopolymer at High Temperature
MA Bin1, YI Zhaolin1, NIU Haihua1,2,*, HUANG Qiqin1
1 School of Architecture and Traffic Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China 2 Department of Engineering Management, Yantai Nanshan University, Yantai 265713, Shandong, China
Abstract: SiO2 aerogel modified geopolymer was prepared with metakaolin and slag as the main raw materials. Meanwhile the influence of temperature on its compressive strength, mass loss rate and microstructure were analyzed, and a thermo-mechanical model of residual compressive strength at different temperatures was established. The results show that the phenomenon is that as the temperature increases, the specimens are first contraction and then cracking, where the water loss of specimens in the hydrophilic group is significantly improved. Another, the mass loss rate tends to increase with the increase of temperature, and is roughly divided into three stages:extreme water loss, slow water loss and rapid water loss. In addition, the compressive strength tends to decrease as the temperature rises. Below 600 ℃, the compressive strength first drops abruptly, and then the trend becomes slower. At 600—800 ℃, the compressive strength drops again and tends to be stable. Among them, the highest mass loss rate is found in the specimens of the reference group at different temperatures, and the highest compressive strength is found in the specimens of the hydrophilic group. Furthermore, an accurate thermo-mechanical model of the residual compressive strength at different temperatures is established by statistical regression analysis method, with a goodness of fit above 0.9.At last, the microscopic analysis shows that the temperature has less influence on the microstructure of hydrophilic group specimens due to the good water locking property of hydrophilic aerogel. As the temperature increases, the water loss mechanism of the specimen can be divided into three stages:the specimens lose free water predominantly below 400 ℃, the bound water starts to come off at 600 ℃, and the porcelainization phenomenon occurs at 800 ℃. Obviously, hydrophilic aerogels have an obvious improvement effect on the high-temperature physical and mechanical properties of geopolymer.
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2023, Vol. 37 
