C60HPC高温后剩余强度及红外检测

Residual mechanical properties and infrared detection of C60HPC after exposed to elevated temperature

对素混凝土和体积掺量1%钢纤维C60高性能混凝土模拟高温试验,对高温后抗压强度、劈拉强度及红外热像进行检测,研究了混凝土红外温升与受火温度及剩余强度的关系。结果表明:C60高性能混凝土抗压强度损失率、劈拉强度损失率和红外平均温升均随受火温度升高增加;掺钢纤维HPC红外平均温升大于素混凝土,300℃之前掺钢纤维混凝土红外温升增加较快,300℃之后增长趋势减缓;掺入钢纤维有助于增加高温后剩余抗压及劈拉强度。

Simulated C60 high-performance concrete with plain concrete and volume content of 1%steel fiber,the experiment measures compressive strength,tensile strength,and infrared thermal image at elevated temperature.The relationship between infrared temperature rise of concrete at elevated temperature and residual strength of fire is studied.The results show that the compressive strength loss rate,tensile strength loss rate,and infrared average temperature rise of C60 high performance concrete increase at elevated temperature.Steel fiber HPC infrared average temperature rise greater than plain concrete,and the infrared temperature rise of steel fiber reinforced concrete before 300℃ increases rapidly,and the growth trend slows down after 300℃.The incorporation of steel fibers helps to increase the residual compressive and tensile strength after exposed to elevated temperature.