Case Study Paper on Field Inspection Guide for Rust on Reinforcing Bars by “is / aci / astm Norms” (A State of an Art Review)

Abstract: Reinforced concrete (RC) is an economical, versatile and successful construction materials as it can be moulded to a variety of shapes and finishes. In most cases, it is durable and strong, performing well throughout its services life. However, in some cases, it does not perform adequately due to various reasons, one of which is the corrosion of the embedded steel bars used as reinforcement. Concrete provides an almost ideal environment for protecting the embedded steel from corrosion due to the passive film surrounding the steel rebar. However, the breakdown of this passive film, either due to chloride attack or due to carbonation, results in the corrosion of rebar. Thus rebar corrosion is one of the main causes of damage and premature failures of the RC structures worldwide, causing enormous costs for inspection, maintenance, restoration and replacement. Therefore, early detection of corrosion and timely remedial action on the affected portion can facilitate an optimum utilization of the structure, imparting longevity to it.

Keywords: Corrosion, preventive measures, Rust, Reinforcement, causes, tolerances, chloride, chemical reaction, deterioration, bond, flaky, formworks, harmful, pressure etc