7/24/2019 Concrete Notes Chloride Mohsin

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Passivating Layer in Concrete

Although steels natural tendency is toundergo corrosion reactions, the alkaline

environment of concrete (pH of 12 to 1!provides steel "ith corrosion protection#At the high pH, a thin o$ide layer formson the steel and prevents metal atomsfrom dissolving#

pH Scale

%umerical &calethat identifiesa'ueoussolution eing

acidic or alkaline 1) is ma$ *

refers toe$treme alkaline

+ is min * refersto e$tremeacidic

is neutral *"ater