Review of Rapid Test Methods for Chloride Diffusion Coefficient

Abstract

Abstract: 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.

Key words: chloride diffusion coefficient, rapid test method, concrete, permeability

CLC Number:

TU528.33

SHI Yueyi, GUO Zengwei, GUO Ruiqi. Review of Rapid Test Methods for Chloride Diffusion Coefficient[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 1-12.

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