不同等级混凝土强度高温衰退性能试验研究

Experimental research on strength decaying of concrete with different grades at elevated temperature

通过不同强度等级和水灰比混凝土的高温试验,考察这些因素对混凝土强度高温衰退性能的影响。结果表明,随温度增加,混凝土强度并非单调下降,而是经历低温衰减、恢复和高温衰退3个阶段。但不同等级混凝土高温强度仍具有相同的变化规律,并在200℃附近有一个极小值。

Through high temperature experiments of concrete with different strength grades and water cement ratios, the effect of these influencing factors on its strength decaying was examined. From the test results it is shown that the concrete strength does not monotonously decline with increase in action temperature and experiences three successive phases： declining at low temperature, recovery and decaying at high temperature. But there still exists a similar trend for different strength grade concretes and has a minimal value at about 200℃.