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硬化混凝土气泡特征参数对混凝土抗冻性具有本质影响,利用Rapid Air 457测试系统得到纤维混凝土试件空气含量、比表面积和气泡间距系数等气泡特征参数,对比混凝土试件受冻前后参数差异,结合抗压和劈裂实验分析素混凝土和纤维混凝土气孔结构特征与宏观力学性能的内在联系,从微观角度探讨其抗冻破坏机理。
The characteristic parameters of hardened concrete bubble have an essential influence on frost resistance of concrete. The air bubble content parameters, such as air content, specific surface area and bubble spacing coefficient, were obtained by using Rapid Air 457 test system. Comparing the parameters of concrete specimens before and after freezing, Compression and splitting experiments were used to analyze the inherent relationship between stomatal characteristics and macroscopic mechanical properties of concrete and fiber concrete, and the mechanism of frost damage was discussed from the microscopic point of view.