氯离子扩散系数快速测试方法综述

氯离子扩散系数是评价混凝土结构抗氯离子渗透性能和使用寿命的重要指标,选择一种快速、准确的测试方法至关重要。本文以非稳态电迁移实验(Rapid Chloride Migration,RCM)为基准,与国内外常用的几种氯离子扩散系数快速测试法比较,总结每种方法的特点及适用范围,建立RCM法与其他测试方法的相关性。结果表明:与国内现行的标准方法RCM相比,Permit(Permeation Migration)法主要用于现场无损检测;NEL法及ACMT(Accelerated Chloride Migration Test)法主要用于测量氯离子稳态扩散系数,若实验结果用于寿命预测,采用ACMT法更为合适,若实验结果用于质量验收或耐久性设计,采用NEL法更为合适。一些学者通过实验建立了RCM法与其他测试方法的换算关系,但仅适用于各自所研究的混凝土,对于其他混凝土是否适用待进一步研究。

Review of Rapid Test Methods for Chloride Diffusion Coefficient

Chloride diffusion coefficient is an important parameter to evaluate the anti-permeability of chloride ion and residual life of concrete structures,hence it is essential to choose a fast and accurate test method to acquire chloride diffusion coefficient.Chloride migration coefficient from non-steady-state migration experiments (Rapid Chloride Migration,RCM) was taken as a benchmark method,and contrasted with the other common test methods at home and abroad.The characteristics and application scope of these methods,as well as their conversion relations with RCM method were concluded.The results show that compared with the RCM method proposed by current specifications,Permit (Permeation Migration) method is mainly used in onsite non-destructive testing,NEL and ACMT (Accelerated Chloride Migration Test) methods are usually used to measurechloride diffusion coefficient in steady-state migration.ACMT method is more suitable used for residual life prediction,while NEL method is preferred for quality acceptance and durability design.Some scholars have established some conversion relationships between RCM method and the other test methods through experiments,but it is only applicable to the concrete in those studies,and whether it is applicable to other concrete needs further study.