Effect of w/cm and Composition on Correlations of Concrete Electrical Resistivity and Chloride Migration Coefficients

Abstract:

The performance with regard to chloride penetration of specimens made with three base compositions (supplementary cementitious materials: 20% fly ash, 20% fly ash + 8% silica fume, and 50% slag replacement by weight of cement), and water-to-cementitious ratios of 0.35, 0.41, or 0.47 were investigated here. In this investigation, laboratory experiments were carried out to study the correlation between electrical resistivity and non-steady state chloride ion migration coefficients (D_nssm) of concrete. NT Build 492 was used to determine chloride migration coefficients. Rapid migration tests and resistivity measurements were performed several times over two years, and the non-steady state migration coefficient (D_nssm) vs. resistivity values were correlated. Experimental results show that a good correlation was found between electrical resistivity and D_nssm. Based on the relationships developed from this investigation, it appears that the correlations are age and composition dependent.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 21-28
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.21
• Online since: September 2016
• Authors: Francisco J. Presuel-Moreno*
• Keywords: Chloride Migration Coefficients, Electrical Resistivity, Fly Ash, Silica Fume, Slag

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