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研究了普通混凝土、聚丙烯纤维混凝、钢纤维混凝土及混杂纤维混凝土高温后的抗压强度、抗折强度及力学性能残余率的变化规律。结果表明,混凝土的力学性能随着温度的升高而逐渐降低;温度小于400℃时,聚丙烯纤维混凝土力学性能有所改善,温度大于400℃时,改善作用不明显;800℃时,钢纤维混凝土力学性能残余率都较高;混杂纤维混凝土抗压强度改善作用最显著,残余率最高。
The compressive strength, flexural strength and residual rate of mechanical properties of ordinary concrete, polypropylene fiber coagulation, steel fiber reinforced concrete and hybrid fiber reinforced concrete were studied. The results show that the mechanical properties of concrete decrease with the increase of temperature. When the temperature is less than 400 ℃, the mechanical properties of polypropylene fiber reinforced concrete are improved. When the temperature is higher than 400 ℃, the improvement is not obvious. When the temperature is 800 ℃, The residual rate of concrete mechanical properties are higher; hybrid fiber reinforced concrete compressive strength of the most significant improvement, the highest residual rate.