Investigation of long-term corrosion resistance of reinforced concrete structures constructed with various types of concretes in marine and various climate environments

Corrosion of steel in reinforced concrete is a serious concern for owners and asset managers of various concrete structures and infrastructure. Literature suggests there is limited research on long-term corrosion behaviour of various types of reinforced concretes under similar conditions of chloride and surrounding temperature environments. This paper presents results of a comprehensive experimental program designed to investigate the long term corrosion resistance of various types of reinforced concretes in the coupled effect of varying chloride and temperature conditions. Large size specimens (slabs) made of ordinary concrete (OC), lightweight concrete (LWC) and self-compacting concrete (SCC) were developed. The specimens were subjected to 365 days of corrosion under varying levels of chlorides and three temperature exposures respectively. The test results indicated that the corrosion rates of the rebars in LWC are the lowest compared to those of OC and SCC. Relations were developed for corrosion rates as a function of percentage chloride, temperature and time for different types of concretes. The current research can serve as a benchmark for adequate selection of type of concrete for construction in aggressive environments. (C) 2019 Elsevier Ltd. All rights reserved.