Working Paper Article Version 1 This version is not peer-reviewed

Effect of Water and Chloride Content on Electrical Resistivity in Concrete

Version 1 : Received: 15 March 2019 / Approved: 18 March 2019 / Online: 18 March 2019 (09:11:10 CET)

How to cite: Yoon, I. Effect of Water and Chloride Content on Electrical Resistivity in Concrete. Preprints 2019, 2019030168 Yoon, I. Effect of Water and Chloride Content on Electrical Resistivity in Concrete. Preprints 2019, 2019030168

Abstract

Since electrical resistivity of concrete can be measured in a more rapid and simple way than chloride diffusivity, it should be primarily regular quality control of the electrical resistivity of concrete which provides the basis for indirect of quality control of concrete durability during the concrete construction. If this is realized, the electrical resistivity of concrete can be a crucial parameter to establish maintenance strategy for marine concrete structures. Electrical resistivity of concrete is important to estimate two processes involved in corrosion of reinforcement: initiation (chloride penetration) and propagation (corrosion rate). The resistivity of concrete structure exposed to chloride indicates the risk of early corrosion damage, because a low resistivity is related to rapid chloride penetration and to high corrosion rate. Concrete resistivity is a geometry-independent material property that describes the electrical resistance, which is the ratio between applied voltage and resulting current in a unit cell. The current is carried by ions dissolved in the pore liquid. While some data exist on the relationship between moisture content on electrical resistivity of concrete, very little research has been conducted to evaluate the effect of chloride on the conduction of electricity through concrete. The purpose of this study is to examine and quantify the effect of pore water and chloride content on surface electrical resistivity measurement of concrete. It was obvious that chloride content had influenced the resistivity of concrete and the relationship showed a linear function. That is, concrete with chloride ions had a comparatively lower resistivity. Chloride can lead to underestimate the electrical resistivity of concrete. Conclusively, this paper suggested the quantitative solution to depict the electrical resistivity of concrete with various chloride contents.

Subject Areas

chloride penetration; pore water; electrical resistivity; service life; concrete durability

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