Density Dependence of Tunnel Fire Resistance for Aerogel-Cement Mortar Coatings  

作　　者：ZHU Pinghua JIA Zhi WANG Xinjie CHEN Chunhong LIU Hui XU Xiaoyan 朱平华;JIA Zhi;王新杰;CHEN Chunhong;LIU Hui;XU Xiaoyan(Department of Civil Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]Department of Civil Engineering,Changzhou University,Changzhou 213164,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第3期598-604,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China(No.51678081);the Natural Science Research of the Jiangsu Higher Education Institution of China(No.18KJB560001)。

摘　　要：Five kinds of mortars with density grades of 500, 600, 700, 800, and 900 kg/m3 were prepared. Their thermal conductivity and compressive strength were measured, and the morphological changes before and after simulated tunnel fire were observed. To investigate the fire resistance, the interfacial temperature of a 30 mm thick aerogel-cement mortar and self-compacting concrete (SCC) in a simulated tunnel fire with the maximum temperature of 1100 ℃ for 2.5 h was tested and recorded. The results showed that as the density decreased, both compressive strength and thermal conductivity of the aerogel-cement mortar exhibited an exponential decrease. The effective fire resistance time of the mortar with 500, 600, 700, 800, and 900 kg/m^3 for protecting SCC from tunnel fire were 97 min, 114 min, 144 min, > 150 min, 136 min, respectively. 700 - 800 kg/m3 was the optimum density for engineering application of tunnel concrete fireproof coating.

关 键 词：aerogel-cement mortar coating density grades compressive strength thermal conductivity simulated tunnel fire resistance 

分 类 号：U454[建筑科学—桥梁与隧道工程] TQ637[交通运输工程—道路与铁道工程]