温度对C15、C30、C40、C60、C80力学性能的影响

Influences of Temperature on the Mechanics Performance of C15、 C 30、 C 40、 C 60、 C80

采用C15、C30、C40、C60、C80混凝土配合X衍射试验、差热试验和热膨胀试验,对不同标号的混凝土在不同组分及中高温下所发生的一系列物理化学变化进行了研究与分析,从而探讨温度对混凝土影响的一些因素,以及在相同温度条件下,不同标号的混凝土所表现的一些性质的差异,从而为工程中使用混凝土提供一些参考。通过多项试验分析,混凝土在受到高温时,必然会发生一些物理化学变化,从而使其强度下降并发生性能的衰减。同时,通过数据的比较发现,高标号的混凝土在高温下发生物理化学变化时所需的温度比低标号的混凝土要高,因此发生破坏的最终时间要相对滞后。

By using C15, C30, C40, C60, C80 concrete with X diffraction test, differential thermal test and thermal expansion test, this paper has studies and analyzed a series of physicochemical changes of various graded concrete in components and under high temperature, thus to probe into some influence factors of temperature on concrete, and the properties difference o! different graded concrete under the same temperature condition, which offers some reference for concrete using in projections. Through tests and analyses, some physicochemical changes are bound to take place in the concrete under the high temperature, reducing its intensity and decaying its performance. Meanwhile, comparison of data shows that the concrete of the higher grade needs higher temperature than the lower graded concrete to achieve the chain of physicochemical changes, thus its final destroying time is comparatively slow.