Pore structure and hardened properties of aerogel/cement composites based on nanosilica and surface modification

被引：49
|
作者：
Lu, Jue [1 ,2 ]
Jiang, Jun [1 ]
Lu, Zhongyuan [1 ]
Li, Jun [1 ]
Niu, Yunhui [1 ]
Yang, Ying [1 ]
机构：
[1] Southwest Univ Sci & Technol, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China
[2] Southwest Univ Sci & Technol, Sch Mat Sci & Engn, Mianyang 621010, Sichuan, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 245卷
关键词：
Aerogel slurry; Surface modification; Nanosilica; Pore structure; Hardened property; Lightweight cement composites; CEMENT; PERFORMANCE; CONCRETE; AEROGELS; MICROSTRUCTURE; MORTAR; BEADS;
D O I：
10.1016/j.conbuildmat.2020.118434
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Lightweight aerogel/cement composites (ACCs) were prepared by introducing a silane coupling agent modified aerogel slurry into a nanosilica enhanced cement paste. The effect of the modification on the pore structure and hardened performance of ACCs was investigated. The results indicate that nanosilica can enhance the matrix. Surface modification of aerogel results in better compatibility and facilitates the preparation of ACCs with synergistic mechanical properties and thermal insulation properties. An ACC with a thermal conductivity of 0.067 W/(m.K), a compressive strength of 1.2 MPa and a density of 390 kg/m(3) was successfully prepared by 66 vol% replacement of cement paste with the modified aerogel slurry. In addition, the total porosity and average pore diameter of the composite are 72.8% and 170.9 nm, respectively. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：13
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