混凝土导电量与气体渗透系数的相关性

Study on Correlation between Charge Passed and Gas Permeability Coefficient of Concrete

探讨了普通混凝土导电量和气体渗透系数这2种耐久性指标间的相关性,并就电极溶液中氯离子迁移量和混凝土导电量的关系以及干燥过程引发的微裂纹对混凝土导电量的影响进行了讨论.研究结果表明：混凝土导电量与气体渗透系数、阴极溶液氯离子减少量之间存在显著的线性相关;ASTM C1202试验中氯离子对混凝土导电量的贡献仅占总导电量的1%~3%,因此以混凝土导电量直接衡量其氯离子渗透性可能有些牵强,可以考虑将阴极溶液氯离子减少量作为评价混凝土渗透性能的一个指标;干燥引发的微裂纹会导致混凝土导电量明显提高.

The correlation between two durability indexes,charge passed and gas permeability coefficient of ordinary concrete,was investigated,the relation between the amount of chloride-ion migration and charge passed,and the influences of micro-crack induced by drying on charge passed were also investigated.The results indicate that： the linear correlations between charge passed and gas permeability coefficient,and the decrement of chloride-ion in cathode cell were found.The percentage of the contribution of chloride-ion to charge passed in ASTM C1202 testing is only about 1%-3%,thus it is not proper to directly measure the chloride-ion permeability of concrete only by charge passed,and the decrement of chloride-ion in cathode cell can be considered as one index of permeability of concrete.In addition,the micro-crack induced by dry-（ing） will cause the charge passed to be improved remarkedly.