混凝土氯离子结合能力的影响因素规律性研究

Research on Influecning Factors of Chloride Ion Binding Capability of Concrete

用自然扩散法测定了混凝土中的总氯离子和自由氯离子浓度,计算了水泥混凝土对C l-的结合能力,研究了暴露时间、水泥品种、水泥用量、水灰比和养护龄期对混凝土C l-结合能力的影响。结果表明:混凝土C l-结合能力与暴露时间无关;与硅酸盐水泥混凝土相比,抗硫酸盐硅酸盐水泥混凝土的氯离子结合能力要高出66%,而普通硅酸盐水泥混凝土要高出10%;水灰比越小,混凝土对氯离子的结合能力越强;混凝土的C l-结合能力随着养护龄期的延长而不断增强。

The total chloride ion and free chloride ion content of concrete were determined by natural diffusion method.Cl-binding capability were calculated for cement concrete.The influences of exposed time,the kind of cement,the amount of cement,water cement ratio and curing age to Cl-binding capacity were discussed.The results show that the exposal time has no effect on the Cl-binding capacity of concrete;The Cl-binding capacity of sulphate-resistant portland cement concrete is 66% larger than portland cement concrete,however,common portland cement concrete is 10% larger;The Cl-binding capacity of concrete increase with the reduction of water cement ratio and the increase of the curing age.