Combined Effect of Carbonation and Chloride on Corrosion of Reinforcement in Fly Ash Concrete

Abstract

Mortars with and without fly ash were cured initially in distilled water or sodium chloride (NaCl) solution for 7, 28, 56, and 91 days and then exposed to accelerated carbonation. It was found that penetration depth of chloride ion in fly ash mortar immersed in NaCl solution is larger at an early age, but becomes almost the same as that of the control mortar later. The depth of carbonation of the mortar cured initially in NaCl solution is smaller than that in distilled water. Fly ash mortar shows higher depth of carbonation than the control mortar. Corrosion current of steel reinforcement in mortar is affected by both depth of carbonation and chloride ion penetration.