Abstract
Understanding and characterizing the relationship between the electrical resistivity and the major influencing factors of the concrete have been all the time a topical research in relation to structural durability. This paper reports an experimental study on the influences of water and chloride contents, and porosity on the electrical resistivity of the Portland cement concrete. The results indicate that the electrical resistivity has a strong correlation with the water and chloride contents in concrete. A new characteristic model has been proposed to represent the correlation. The proposed model has been implemented into a numerical modelling case study of cathodic protection for reinforced concrete structure in saline environment..
Highlights
Electrical resistivity of concrete plays an important role in the assessment of the condition of concrete structures and the state of corrosion protection for reinforcement [1,2,3,4]
As an effort to address the challenge, this paper reports an experimental study and mathematical characterisation work on concrete electrical resistivity to investigate three major influencing factors, including, water saturation, chloride content and porosity, and a case study to use the characteristic model in a numerical modelling of Cathodic protection (CP) for a reinforcement concrete structure exposed to costal conditions
It was noticed that chloride content has a neglectable effect on the porosity of the prepared samples when compared with water to cement ratio
Summary
Electrical resistivity of concrete plays an important role in the assessment of the condition of concrete structures and the state of corrosion protection for reinforcement [1,2,3,4]. The total water content, the chloride concentration in pore water, and concrete pore structure are the three factors of the primary interest in the concern of concrete electrical resistivity. The modelling of the CP process operated on reinforced concrete structures is generally based on the Nernst-Planck equation and the Ohm’s law [11]. To solve the governing equations, concrete electrical resistivity as a material parameter is required. To accurate estimate the concrete resistivity at varied environmental conditions is important for the assessment of the CP protection for the reinforcement in concrete
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