Abstract
Sulphate attack is one of the phenomena that may cause gradual but severe damages to concrete structures durability. Sulphate attack is due to a series of chemical reactions between sulphate ions and principle components of the cement paste microstructure. In this work the effects of 1.5% and 4.5% MgSO4 additions on concrete durability of 0.45 and 0.65 water/cement ratios (w/c) and the residual effects on corrosion of steel reinforcement were investigated using concrete resistivity. The results shows that 2% addition of Bambusa arundinacea green inhibitor improved the concrete resistivity of MgSO4 contamination concrete by 54% and 64% for 0.45 and 0.65w/c ratios respectively. Thus comparatively, Bambusa arundinacea inhibitor performed far better than Calcium nitrite, Ethanolamine inhibitors and even the non-contaminated control sample. This confirmed a linear relationship between concrete resistivity and probability of corrosion in concrete. Concrete resistivity has proven to be effective parameter for the estimation of the risk of steel reinforcement in concrete.
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