高温作用后玻化微珠保温混凝土受压力学性能试验研究

Experimental study on compression behavior of thermal insulation glazed hollow bead concrete after high temperature

为了研究玻化微珠保温混凝土高温(火灾)后的受压力学性能,设计了玻化微珠保温混凝土和普通混凝土标准受压试件的高温及抗压试验。根据试验结果,分析了玻化微珠保温混凝土和普通混凝土经受高温后的立方体抗压和轴心抗压破坏形态的异同,总结了2种受压强度在不同高温作用后的损失规律,并采用最小二乘法回归了玻化微珠保温混凝土高温后受压强度以及其"轴压比"随温度变化的解析表达式。结果表明:玻化微珠保温混凝土和普通混凝土受压破坏形态基本一致,但2种混凝土经受高温后的破坏均比常温下严重;受压强度随温度变化的拟合公式可为玻化微珠保温混凝土的结构设计提供理论参考。

In order to study the compressive mechanical properties of thermal insulation glazed hollow bead concrete after high temperature,the compressive specimens of thermal insulation glazed hollow bead concrete and ordinary concrete were designed to do high temperature test and compression test.According to the test results,the damage morphology of cube compression and axial compression was analyzed,the law for compressive strength loss after different high temperatures was summarized,and the least square method was utilized to fit the compression and 'axial compression ratio' with temperature of thermal insulation glazed hollow bead concrete after high temperature.The results showed that the compressive demolition of the two kinds of the concrete is similar,but the demolition after high temperatures is more serious than room temperature,the fitting formula of compressive strength with temperature changes could provide theoretical reference for the structure design of thermal insulation glazed hollow bead concrete.