多因素影响下高温后混凝土劈裂抗拉强度试验

Experimental Study on Splitting Tension Strength of Fire-damaged Concrete with Different Influencing Factors

对高温后C35混凝土的切片劈裂抗拉强度进行了试验研究,考虑了最高温度、恒温时间和冷却后所处的环境对混凝土抗拉强度的影响,对得到的试验结果进行了公式拟合。结果表明,最高温度是影响混凝土抗拉强度最重要的因素,而在最高温度不超过600℃,恒温时间不超过60 min的情况下,恒温时间的影响也是比较明显的。200℃以上的高温作用后,升降温后潮湿环境养护过的混凝土的抗拉强度比升降温后未养护混凝土的抗拉强度有明显提高。

Splitting tension strength of fire-damaged C35 concrete was researched. The variations of concrete tension strength with maximum temperature, constant temperature time and curing process were activdy tested based on concrete slices. Two formulae were proposed to calculate tension strength of fire-damaged concrete and fire-damaged concrete cured in water. The experimental results show that maximum temperature is the most important factor for concrete tension strength, and when maximum temperature is lower than 600 ℃ and constant temperature time is shorter than 60 minutes, constant temperature time is also necessary. For tension strength of fire-damaged concrete and fire-damaged concrete cured in water, the latter is higher than that in the former temperature which is above 200℃.