中文摘要：

为探明聚丙烯纤维混凝土的高温损伤机理,本文开展了聚丙烯纤维混凝土高温试验,研究分析了混凝土动弹性模量、质量损失率随温度的变化规律,采用扫描电镜和氮吸附试验研究分析了混凝土高温后的微观结构。结果表明：经历高温后,聚丙烯纤维混凝土的动弹性模量高于素混凝土,质量损失率也更小。聚丙烯纤维混凝土的孔径分布规律、孔隙结构与素混凝土相近。

英文摘要：

In order to investigate the damage mechanism of polypropylene fiber reinforced concrete after being exposed to high temperature,the high-temperature test was conducted,and the dynamic elasticity modulus and mass loss rate variation were analyzed.Both of the SEM and BET test were used to analysis the microstructure of concrete after the high temperature exposure.Studies have shown that,after the high temperature,the fiber reinforced concrete has higher dynamic elastic modulus than plain concrete,and the mass loss rate is even lower.Meanwhile,the pore structure of the fiber reinforced concrete is similar to the plain concrete.