CARBONATION PERFORMANCE OF OPC-SLAG-FLY ASH BINDER SYSTEM

摘要

Corrosion of steel reinforcement in concrete is the leading cause of deterioration of concrete structures. Carbonation induced corrosion is prevalent in cements containing Supplementary Cementitious Materials (SCMs). In this study, the carbonation performance of cement containing fly ash and combination of slag and fly ash is investigated. Concrete specimens cast at two different water to cement ratios were subjected to accelerated and natural carbonation conditions. Effect of carbonation on pore structure properties of concrete like porosity and sorptivity was also investigated. The carbonation resistance of slag-fly ash blend was lower as compared to fly ash for the selected composition. Increase in porosity and rate of water absorption was observed on carbonation in blended cement systems.