单轴受压后混凝土导电量变化规律研究

On charge passed through concrete after uniaxial compression

采用ASTM C1202直流电量法探讨混凝土在单轴受压后产生的微裂纹对混凝土导电量及其渗透性能的影响。研究结果表明:各类试样在经过不同水平的压缩荷载后,其导电量都有不同程度的提高,导电量随着荷载水平的增加呈二次曲线增长,同等荷载水平下,掺合料混凝土的导电量要低于普通混凝土;随着荷载提高至某一水平,其导电量水平已不能反映其抗渗性能,此时,将荷载后试块的实际氯离子迁移量,作为评价混凝土荷载后渗透性能的一个指标将更为恰当。

This paper discusses the effects of different degrees of load on charge passed through concrete by ASTM C1202 method.The results indicate that the charge passed through concrete after different levels of compressive loading has different growth which shows a quadratic curve.The mineral admixture can significantly reduce the permeability of concrete,the affect on charge passed through the mineral admixture modified concrete is less than that of the normal concrete.As the load increases to a certain level,the evaluation criteria of charge passed is not suitable for evaluating these species.Moreover,the chloride-ion migration amount of species after loading can be considered as one quantitative index of concrete permeability.