高强混凝土高温后的力学性能研究

Mechanical Properties After High Temperature Process of High Strength Concrete

对C60高强混凝土经不同高温历程(不同受热温度与不同恒温时间的组合)后的力学性能进行了试验研究,重点分析了其外观表征、抗压强度、峰值应变等的变化规律。结果表明:经不同高温历程后,C60高强混凝土的外表色泽变浅,从300℃恒温1小时开始混凝土试块呈铁锈红色,直到恒温3小时铁锈红色消失,800℃试块外表呈现为灰白色。随着试块受热温度的升高与所受恒温时间的增长,高强混凝土的抗压强度总体呈下降趋势,且相对恒温时间的不同,受热温度的变化对高强混凝土力学性能的影响更大。

In this paper, the mechanical properties of C60 high-strength concrete subjected to different heating temperatures and different constant temperature times were studied. The changes of appearance, compressive strength and peak strain of high-strength concrete are analyzed. The results show that the color of C60 high strength concrete is shallow after high temperature process, a part of specimens appeared rust red after heating 1 hour at 300℃, the rust red disappears after 3 hand and the specimen s appearance turned into off-white at 800℃ With the increase of heating temperature and the increase of constant temperature time, the compressive strength of high-strength concrete will decrease overall, and the relative temperature is different, the heating temperature is different. The change has a greater influence on the mechanical properties of high-strength concrete.