Comparative Study of Corrosion Resisting Behavior of Steel Reinforcement

Abstract

The corrosion of reinforcing steel in concrete had received increasing attention in recent years because of the severe damage to concrete structures. It is so severe that we need a high cost dramatic repair of the structure. The corrosion of reinforcing steel results mainly from the destruction of the protective oxide film by chloride attack or/and carbonation of the concrete. Extensive research into factors contributing to corrosion of reinforcing steel has increased our understanding of the corrosion mechanism. Also the assessment of the state of steel corrosion using different corrosion detection and monitoring techniques, different levels of the corrosion rate are observed. The different values of corrosion may be mainly as cribbed to different mechanisms of detection methods and environmental influences. This study deals with minimizing the corrosion of reinforcement steel in concrete and to decide the suitable type of steel reinforcement for the same. Four different types of steel bars were used to study their behavior under extreme conditions against rate of corrosion in reinforcing bars of concrete. The effective cover for reinforcement members was considered an important factor to control the rate of corrosion. Thus, four different types of reinforcing steel bars with three different effective covers were considered for the corrosion study, resulting into 36 specimens. The rate of corrosion was measured with the help of half cell potentiometer method. Also the current flow through specimen was measured using microammeter test. The results concluded that specimens under high saline conditions are having more variation in rate of corrosion.

Keywords: Corrosion, reinforcing steel, effective cover