Effect of Corrosion on R.C.Columns

Abstract

Reinforced Cement Concrete is one of the most important structural materials used in the construction industry worldwide. It is expected that these structures will serve for a long period of time. But there are many instances of premature failure of RC structures, raising doubts about its durability. Most of these failures are attributed to the corrosion of reinforcement embedded in concrete. Generally, concrete provides an environment, which should ideally protect the embedded steel. This is true provided the quality of the concrete is good and sufficient cover is provided to the reinforcement. Concrete of low water-cement ratio and good compaction has low permeability that minimizes penetration of corrosive agents like oxygen, carbon-di-oxide, chloride ions etc. Corrosion of reinforcement is an international problem that causes extensive damages to various types of structures. The present project work deals mainly with corrosion of reinforcing steel in concrete columns in saline environment. The influence of concrete mix, concrete cover and reinforcing bar diameter on the rate of corrosion and the loss of bond due to corrosion level of reinforcing bars are also investigated.