Title : CORROSION PERFORMANCE OF CONCRETE WITH RECYCLED CONCRETE AGGREGATE
Authors : Ruby Abraham1 and S Jayasree2
Publication : 23 - 26 October 2013
Volume :
Pages :
Price : 250
Abstract : Waste arising from construction and demolition constitutes one of the largest waste streams in India and many other countries. Concrete recycling gains importance because it protects natural resources and eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or other applications. Research in this area showed that satisfactory concrete can be made by recycling concrete as aggregate with properties comparable with that of ordinary concrete. But contrary to ordinary concrete, where penetration of chlorides is caused by sources outside the concrete, recycled aggregate concrete has an additional source of chlorides when chloride-contaminated concrete is used as aggregate inside the new concrete. In the present study, experimental investigations were carried out to determine the effect of corrosion on recycled aggregate concrete. Five different % replacement of coarse aggregate namely 20%, 40%, 60% and 80% were considered. Considering the fresh and hardened properties of M20 grade concrete, 20% and 40% replacement were selected for corrosion study. Corrosion studies using Calomel electrode, weight loss method and Tafel extrapolation technique were carried out. The results indicate that the quantity of recycled aggregate has a minor influence on chloride ingress