Density Dependence of Tunnel Fire Resistance for Aerogel-Cement Mortar Coatings
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第3期
论文作者：朱平华 JIA Zhi 王新杰 CHEN Chunhong LIU Hui XU Xiaoyan
文章页码：598 - 604
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 1 100 ℃ 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/m3 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.
朱平华，JIA Zhi，王新杰，CHEN Chunhong，LIU Hui，XU Xiaoyan
Department of Civil Engineering, Changzhou University
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 1 100 ℃ 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/m3 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.
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