Experimental Study on the Influence of Silica Aerogel on the Properties of Superfine-cement Composites
HAN Fenglei1,2,*, LIU Yan1,2, LIU Tao1,2, ZHANG Xuefu1,2, LYU Yang1,2, ZHAXI Nima3
1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 3 Tibet Tianlu Co., Ltd., Lhasa 850000, China
Abstract: Due to the lower mechanical strength, the application potential of silica aerogel cement-based materials with excellent thermal insulation, fireproofing and lightweight properties was greatly under restriction. The characteristics of high activity and fast hydration speed of superfine cement could promote the growth of compressive and flexural strength. Therefore, the superfine cement was chosen as the cementitious material in this experiment, to prepare aerogel cement-based materials with the property of both thermal insulation and strength. Based on replacing the equal volume of sand by SiO2 aerogel particles, the fluidity, dry density, water absorption, thermal conductivity, mechanical properties, and microstructure of cementitious materials were investigated under the different dosages of silica aerogel (the volume of sand and aerogel was 60%). The results showed that with the increase of aerogel content from 0% to 60%, the material fluidity decreased by 7.3%—22.3%, and the dry density gradually decreased while the water absorption increased. The thermal conductivity in the saturated and dry state decreased separately from 2.58 W/(m·K) to 0.49 W/(m·K) and from 2.55 W/(m·K) to 0.24 W/(m·K), indicating a significant improvement on the perfor-mance of thermal insulation. The compressive strength and flexural tensile strength ranged from 66.3 MPa to 14.1 MPa, and from 12.9 MPa to 3.1 MPa, which was decreased by 76.0% and 78.7% respectively compared with the sample unincorporated aerogel. Based on the analysis of SEM and EDS, there was a gap between the aerogel particles and surrounding cement matrix, and the Ca/Si atomic number ratio between the gape ranged from 0.64 to 1.13. The product of alkali-silicate reaction was C-S-H (calcium silicate hydrate) between silica aerogel and ultra-fine cement pore solution, which was helpful to improve the strength of interfacial transition zone.
韩风雷, 刘艳, 刘涛, 张学富, 吕洋, 扎西尼玛. SiO2气凝胶对超细水泥基材料性能影响的试验研究[J]. 材料导报, 2023, 37(15): 22080137-7.
HAN Fenglei, LIU Yan, LIU Tao, ZHANG Xuefu, LYU Yang, ZHAXI Nima. Experimental Study on the Influence of Silica Aerogel on the Properties of Superfine-cement Composites. Materials Reports, 2023, 37(15): 22080137-7.
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2023, Vol. 37 
