双因素作用下混凝土对氯离子结合能力研究

Research on the Chloride Binding Capacity of Concrete under Double Damage Factors

通过对质量浓度为3.5 %NaCl溶液腐蚀浸泡的单因素试验和干湿循环 -氯盐腐蚀双因素试验 ,研究了在大掺量情况下 ,矿物掺合料种类对氯离子结合能力的影响。同时研究了干湿循环对不同配比混凝土的氯离子结合能力的影响。结果表明 ,矿物掺合料能提高氯离子的结合能力且结合能力与混凝土离试件表面的深度以及该处自由氯离子浓度成幂函数关系。与浸泡单因素作用相比 ,干湿循环会提高矿物掺和料的氯离子结合能力。

Besed on tests of immerging the concrete in a solution with3.5%NaCl concenfration,the single-factor's corrosion,and dry-wet cycling that in the same solution,the double-factor's corrosion,it has been studied for the effect of different kinds of mineral admixtures on the chloride binding capacity of concrete and the influence of dry-wet cycling action on the chloride binding capacity of concrete with different proportion.The rezults showthat,the mineral admixture can enhance chloride binding capacity and the relationships between the binding capacity and the depth of concrete or free-Cl - concentration are in the certain power.Besides,compared with immerging test,the chloride binding caˉpacity of concrete with mineral admixture will be increased by dry-wet cycling action.