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利用自行设计高温压力加载试验装置,研究了高温后受损衬砌高性能混凝土(HPC)残余抗压强度在不同条件下随温度劣化的规律和定量关系,建立了火灾后隧道衬砌HPC残余抗压强度与火场温度之间的数学关系式.研究表明:高等级的HPC强度很高,但其抗火性能很差;在高温过程中及自然冷却条件下,HPC残余抗压强度总体上呈降低趋势,在300℃时,C50HPC残余抗压强度有小幅增加;射水冷却条件下,HPC残余抗压强度随着温度升高一直呈衰减状态;相同加热温度等级条件下,高温过程中HPC的残余抗压强度略高于自然冷却后HPC的残余抗压强度,自然冷却后HPC的残余抗压强度高于射水冷却后HPC的残余抗压强度.
The self-designed high-temperature pressure loading test device was used to study the regularity and quantitative relationship of the residual compressive strength of high performance concrete (HPC) damaged by high temperature at different temperatures with temperature, and the residual compressive strength And the temperature of the fire field.The results show that high-grade HPC has a high strength but poor fire resistance, and the residual compressive strength of HPC tends to decrease at high temperature and under natural cooling conditions, The residual compressive strength of C50HPC increases slightly at 300 ℃. The residual compressive strength of HPC decreases with increasing temperature under the condition of water cooling. Under the same heating temperature, the residual compressive strength of HPC Slightly higher than the residual compressive strength of HPC after natural cooling. The residual compressive strength of HPC after natural cooling is higher than that of HPC after water-cooled.