热-力耦合作用下PVA纤维混凝土抗压强度试验研究

摘要

Reviewed the domestic and foreign change of concrete and PVA fiber concrete at room temperature and after high temperature.The compressive strength of three kinds of water binder ratio concrete and PVA fiber concrete at the temperature of 20,200,400,600 and 800 ℃ were studied.The results showed the compressive strength and residual compressive strength of plain concrete and PVA fiber concrete increased at first and then decreased.The compressive strength of the two kinds of concrete reaches peak value at 400 ℃.And the formula of the relative residual compressive strength of three kinds of water binder ratio plain concrete and PVA fiber reinforced concrete was fitted.It provides some reference value for the application of PVA fiber in practical engineering.%综述了国内外普通混凝土及PVA纤维混凝土常温及高温后的力学性能演化规律.研究了3种水胶比普通混凝土及PVA纤维混凝土在20、200、400、600、800 ℃五个温度段热-力耦合作用下的抗压强度,结果表明:普通混凝土及PVA纤维混凝土抗压强度、抗压强度剩余率都随温度上升呈先升高再降低趋势,两类混凝土抗压强度都在400 ℃时达到峰值.同时对3种水胶比普通混凝土及PVA纤维混凝土的相对残余抗压强度随温度的变化规律进行了公式拟合,为PVA纤维在实际工程中的应用提供了一定的参考价值.