Title: Electrical Resistivity of Concrete Exposed to Chlorides and Sulfates
Author(s): Ronaldo A. Medeiros-Junior, Patrícia Schnepper Gans, Eduardo Pereira, and Elias Pereira
Publication: Materials Journal
Appears on pages(s): 119-130
Keywords: chloride; compressive strength; electrical resistivity; sulfate; wetting and drying cycles
Correlations between compressive strength and electrical resistivity of concretes exposed to different aggressive conditions were sought to evaluate concrete quality. Concrete specimens were cast with four water-cement ratios (w/c) and exposed to five different conditions of water, chloride, and sulfate solutions. Electrical resistivity and compressive strength tests were performed from 28 to 189 days. The results were statistically analyzed and supported by SEM and XRD analyses. When correlating both properties, higher coefficients of determination were found for conditions of underwater and wetting and drying cycles in water. In general, 71.4% of the coefficients of determination were greater than 0.700. The lowest correlations were found for concrete exposed to chloride solutions because the electrical resistivity of the specimens in these conditions tends to remain constant over time.