RPC高温后抗折强度试验及红外检测

Flexural strength test and infrared detection of RPC after elevated temperature

试验控制聚丙烯纤维、玄武岩纤维体积掺量保持不变,绘制了不同钢纤维体积掺量RPC高温后抗压强度比、抗折强度的变化曲线,并采用红外无损检测技术分析照射时间对红外温升的影响,建立了RPC红外温升与受火温度、抗折强度之间的拟合曲线。试验结果表明:随着受火温度升高,混凝土抗压强度比、抗折强度呈下降趋势;混掺纤维RPC红外温升与受火温度、抗折强度具有线性关系,红外照射时间采用3 min为最佳照射时间。

In this test,the volume of polypropylene fiber and basalt fiber was kept unchanged,and the curves of compressive strength ratio and flexural strength of RPC with different steel fiber volume content after high temperature were plotted.The influence of irradiation time on infrared temperature rise was analyzed by infrared nondestructive testing technology.A fitting curve between RPC infrared temperature rise and fire temperature and flexural strength is established.The test results show that the compressive strength ratio and flexural strength of concrete decrease with the increase of fire temperature;The infrared temperature rise of the blended fiber RPC has a linear relationship with the fire temperature and the flexural strength;The optimal irradiation time is chosen to be 3 minutes.