Influence of binder type on the durabilityof reinforced concrete structures

Reinforcement corrosion reduction

Cement extenders such fly ash, slag and silica fume can dramatically reduce the rate of corrosion of reinforcing steel in cracked concrete. The presence of a transverse crack in reinforced concrete specimens, subjected to cycles of wetting and drying with a chloride solution to simulate a marine environment, resulted in rapid initiation of corrosion of the steel at the location of the crack. The initiation period was essentially negated and active corrosion started within a few weeks of testing. The protection afforded the embedded reinforcing steel was the increase in resistivity of the concrete, associated with the inclusion of cement extenders, which resulted in a reduction in the overall rate of corrosion.

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