高性能混凝土高温后劈裂抗拉强度试验研究

Experimental Study on Splitting Tensile Strength of HPC after Elevated Temperature

在不同温度相同恒温时间以及相同温度不同恒温时间两种情况下对C40高性能混凝土立方体试件的劈裂抗拉强度进行试验研究,分析讨论了不同高温作用后混凝土材料劣化的机理以及对劈裂抗拉强度的影响,探讨了劈裂抗拉强度随温度变化的规律。结果表明,高温后对混凝土的劈裂抗拉强度影响最大的因素是作用的最高温度,在相同的恒温时间条件下,C40高性能混凝土的劈裂抗拉强度随着经历温度的升高总体呈下降趋势;在相同的试验温度条件下,混凝土的劈裂抗拉强度随着试验时间的延长会出现反弹现象。

Based on splitting tests on high performance concrete （HPC） of C40 cube specimens in two situations： different temperatures with the same duration time and the same temperature with different duration time, the degradation mechanism about HPC after elevated temperature and the impact on splitting tensile strength are discussed, and the variation law of splitting tensile strength with temperature is investigated. The results show that the most remarkable factor of splitting tensile of concrete after elevated temperature is the supreme test temperature. In the situation of the same duration time, the splitting tensile strength of HPC of C40 presents downtrend in general. In the situation of the same elevated temperature, the splitting tensile strength of concrete rebounds with the extension of test time.