Corrosion Protection of Thin Precast Concrete Sections
D. H. Pletta, E. F. Massie, and H. S. Robins
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A new electrical resistance technique for measuring the rate of corrosion of steel reinforcing is described. The method employs a thin ribbon 0.008 x 0.25 in. as the resistance element embedded in 6 x 12 in. thin panels, and a Kelvin bridge sensitive to 0.0001 ohm, The data plotted in dimensionless parameter form enable the half-life of concrete to be determined at a comparatively early age. The term half-life is defined as the time required for the cross-sectional area of the reinforcing to decrease by one-half its orginal value due to corrosion. Six mixes, three water-cement ratios, four exposure conditions and three depths of cover were examined.