高温后C80高强混凝土的质量损失和抗压性能研究

Mass Loss and Compressive Properties of C80 High Strength Concrete at Elevated Temperature

对掺聚丙烯纤维的C80高强混凝土立方体试件模拟高温试验后,进行混凝土质量损失和抗压性能测试,研究分析了不同作用温度对聚丙烯纤维高强混凝土的质量损失和抗压强度的影响。结果表明,随着温度的升高,掺聚丙烯纤维高强混凝土的质量损失逐渐增加而抗压强度整体呈下降趋势,600℃高温后混凝土立方体抗压强度急剧下降,强度值仅为常温的25.05%;高温后聚丙烯纤维高强混凝土的相对质量损失和相对残余抗压强度的整体变化趋势基本相似。

In this study,the mass loss and compressive properties of high strength concrete（ HSC） cube specimens mixed with polypropylene（ PP） fiber after high temperature was investigated. After these specimens were heated in an electric stove,the effect of high temperature on mass loss and compressive strength of HSC was analysiced. The results show that the compressive strength of HSC after high temperature indicated varying degrees of decline,on the contrary,the mass loss of HSC increased gradually. After 600 ℃,the compressive strength of HSC fell sharply and was only 25. 05% of that at normal temperature. Meanwhile,with the increase of temperature,the relative mass loss and relative residual compressive strength of HSC with polypropylene fiber are similar to that of the overall trend.