Resistance to Corrosion of Reinforcement of High Volume Fly Ash Concrete

Abstract

Due to the increasing of interest about the eco-friendly concrete, it is increased to use concretes containingby-products of industry such as fly ash(FA), ground granulated blast furnace slag(GGBFS), silica fume(SF),and etc. Especially, these are well known for improving the resistances to reinforcement corrosion in concreteand decreasing chloride ion penetration. The purpose of this experimental research is to evaluate the resistanceagainst corrosion of reinforcement of high volume fly ash(HVFA) concrete which is replaced with highvolume fly ash for cement volume. For this purpose, the concrete test specimens were made for variousstrength level and replacement ratio of FA, and then the compressive strength and diffusion coefficientfor chloride ion of them were measured for 28, 91, and 182 days, respectively. Also, corrosion monitoringby half cell potential method was carried out for the made lollypop concrete test specimens to detect thetime of corrosion initiation for reinforcement in concrete. As a result, it was observed from the test resultsthat the compressive strength of HVFA concrete was decreased with increasing replacement ratio of FAbut long-term resistances against reinforcement corrosion and chloride ion penetration of that were increased.