摘要
采用体积取代法将气凝胶浆料引入水泥基体中,制备了气凝胶-水泥复合多孔材料(ACPC),结合压汞(MIP)、氮吸附(NAD)和扫描电子显微镜(SEM)对ACPC孔结构和微观形貌进行表征,研究了ACPC的孔结构和硬化性能。试验结果表明,当气凝胶浆料取代量由0增加到66%时,材料孔隙率从23.0%上升至78.1%,平均孔径从45.3 nm增加至198.3 nm。气凝胶的引入可以细化孔结构,材料介孔孔容由0.03 mL/g增加到0.20 mL/g,孔结构得到改善。在水泥浆体中引入气凝胶浆料,可以得到干密度为365~1262 kg/m^3、抗压强度为0.8~24.1 MPa、导热系数为0.066~0.364 W/(m·K)的ACPC。
Aerogel slurry was introduced into cement system to prepare aerogel-cement porous composites(ACPC)by volume substitution method.MIP,NAD and SEM were used to characterizate the pore structure and morphology of ACPC.The pore structure and hardened properties of ACPC were investigated.The results show that the porosity of ACPC increases from 23%to 78.1%and the average pore diameter of ACPC increases from 45.3 nm to 198.3 nm with the increasing aerogel slurry replacement from 0 to 66%.The aerogel slurry can refine voids,and the mesoporous volume increases from 0.03 mL/g to 0.20 mL/g.Adding aerogel slurry into cement paste can get ACPC with a dry density,compressive strength and thermal conductivity of 365~1262 kg/m^3,0.8~24.1 MPa,and 0.066~0.364 W/(m·K),respectively.
作者
路珏
蒋俊
卢忠远
李军
LU Jue;JIANG Jun;LU Zhong-yuan;LI Jun(State Key Laboratory of Environment-friendly Energy Materials,Mianyang 621010,China;School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《混凝土与水泥制品》
北大核心
2020年第9期11-15,共5页
China Concrete and Cement Products
基金
国家重点研发计划项目(2016YFC0701004)
四川省科技计划项目(2018GZ0152、18YYJC0904)。
关键词
气凝胶浆料
水泥基材料
孔结构
力学性能
保温隔热性能
Aerogel slurry
Cement-based material
Pore structure
Mechanical property
Thermal insulation performance
