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.
1 Xu Q B, Jiang X B, Liu X Z. Advanced Materials Industry, 2021(2), 43 (in Chinese). 徐勤保, 江旭波, 刘新状. 新材料产业, 2021(2), 43. 2 Miao S L, Li Q T, Zhao Y Y, et al. Journal of Basic Science and Engineering, 2021, 29(4), 999 (in Chinese). 苗生龙, 李庆涛, 赵园园, 等. 应用基础与工程科学学报, 2021, 29(4), 999. 3 Guo J Y, Zhao Y M, Zhang L J, et al. Materials Reports, 2019, 33(S1), 202 (in Chinese). 郭建业, 赵英民, 张丽娟, 等. 材料导报, 2019, 33(S1), 202. 4 Zhu Pinghua, Xu Xiaoyan, Liu Hui, et al. Construction and Building Materials, 2020, 239, 117857. 5 Zhang H Y, Yang J M, Wu H J, et al. Solar Energy, 2020, 204, 569. 6 Liu P, Gong Y F, Tian G, et al. Construction and Building Materials, 2021, 272, 121895. 7 Farhad A. Journal of Materials in Civil Engineering, 2016, 28(1), 04015062. 8 Ma B, Zhu L W, Niu H H, et al. Journal of Materials Science and Engineering, 2021, 39(4), 590 (in Chinese). 马彬, 朱林伟, 牛海华, 等. 材料科学与工程学报, 2021, 39(4), 590. 9 Cao J S. Bulletin of the Chinese Ceramic Society, 2017, 36(4), 1452 (in Chinese). 曹集舒. 硅酸盐通报, 2017, 36(4), 1452. 10 Ma X, Ye X W, Zhu J, et al. Journal of Building Materials, 2017, 20(3), 373 (in Chinese). 马骁, 叶雄伟, 朱杰, 等. 建筑材料学报, 2017, 20(3), 373. 11 Niu H H. Thermal-mechanical properties of calcium-based geopolymers modified by SiO2 aerogel, Master's Thesis, Guilin University of Electronic Technology, China, 2021 (in Chinese). 牛海华. SiO2气凝胶改性钙基地聚合物的热-力学性能研究. 硕士学位论文, 桂林电子科技大学, 2021. 12 GB/T 17671-1999, 水泥胶砂强度检验方法(ISO法), 中国标准出版社, 1999. 13 Zhu J S, Xu J Y, Luo X. Concrete, 2014(8), 8 (in Chinese). 朱靖塞, 许金余, 罗鑫. 混凝土, 2014(8), 8. 14 Li N, Xu Z H, Chen X Y, et al. Bulletin of the Chinese Ceramic Society, 2019, 38(4), 957 (in Chinese). 李娜, 徐中慧, 陈筱悦, 等. 硅酸盐通报, 2019, 38(4), 957. 15 Zheng J R, Liu L N. Journal of Zhengzhou University (Engineering Science), 2007(3), 05 (in Chinese). 郑娟荣, 刘丽娜. 郑州大学学报(工学版), 2007(3), 05. 16 Zheng W Z, Zhu J. Journal of Wuhan University of Technology (Materials Science Edition), 2013, 28(4), 721. 17 William G V S, Ruby M G. Construction and Building Materials, 2017, 154, 229. 18 Gao R, Zhou Z J, Zhang H B, et al. Inorganic Chemicals Industry, 2019, 51(9), 50 (in Chinese). 高睿, 周张健, 张宏博, 等. 无机盐工业, 2019, 51(9), 50. 19 Zhou Y B, Kong G, Lai D L, et al. Aerospace Materials & Technology, 2021, 51(3), 08 (in Chinese). 周颖博, 孔纲, 赖德林, 等. 宇航材料工艺, 2021, 51(3), 08. 20 Bell J L, Driemeyer P E, Kriven W M. Journal of the American Ceramic Society, 2009, 92(1), 01. 21 Zheng K R, Chen L, Mulbah G. Construction and Building Materials, 2016, 125, 1114. 22 Zhang S S, Gao H B, Wang X, et al. Cement Engineering, 2021(1), 7 (in Chinese). 张书石, 高洪波, 王玄, 等. 水泥工程, 2021(1), 7. 23 Kong D L Y, Sanjayan J G. Cement and Concrete Composites, 2008, 30, 986. 24 He P G, Jia D C, Lin T S, et al. Ceramics International, 2010, 36(4), 1447. 25 Abdulkareem O A, Bakri A M A M, Kamarudin H, et al. Construction and Building Materials, 2014, 50, 377. 26 Liu X, Peng Z C, Pan C H, et al. Materials Reports B:Research Papers, 2020, 34(11), 22078 (in Chinese). 刘鑫, 彭泽川, 潘晨豪, 等. 材料导报:研究篇, 2020, 34(11), 22078. 27 Lv T Q, Zhao G F, Lin Z S, et al. Journal of Building Materials, 2003(2), 135 (in Chinese). 吕天启, 赵国藩, 林志伸, 等. 建筑材料学报, 2003(2), 135. 28 Fu B, Yang C H, Ye J X, et al. Journal of Building Materials, 2014, 17(6), 1060(in Chinese). 傅博, 杨长辉, 叶剑雄, 等. 建筑材料学报, 2014, 17(6), 1060.