火灾高温后混凝土残余强度的试验研究

Experimental Study on Residual Strength of Concrete after High Temperature

为研究冷却方式对不同类型水泥混凝土高温后残余强度的影响,设置了温度为500℃、600℃、700℃、800℃、900℃的梯度,分别对采用复合硅酸盐水泥和矿渣硅酸盐水泥的立方体标准试块进行高温后力学试验。通过试验考察不同冷却方式下试块高温后的破坏形态、残余强度,并进行XRD分析,解释了冷却方式、水泥种类、受火时间等因素对高温后混凝土残余强度的影响。试验表明:高温后混凝土的破坏形态与其采用水泥种类及受火时间有关;冷却方式对不同水泥混凝土高温后的残余强度影响不同。

Study the effect of cooling method on the residual strength of different types of cement concrete after high temperature,the gradient of 500 ℃,600 ℃,700 ℃,800 ℃ and 900 ℃ was set up. The effects of composite portland cement and slag silicate cement cube standard test block after high temperature mechanical test were presented. The effects of cooling mode,cement type and fire time on the residual strength of concrete after high temperature were explained by XRD analysis of the failure modes and residual strength of the test block under different cooling methods. The results show that the failure pattern of concrete after high temperature is related to its use of cement type and fire time. The cooling method has different influence on the residual strength of different concrete concrete after high temperature.