Influences of Coating Materials on Reinforcement Corrosion-induced Cover Cracking Time

Abstract

Several methods prevent damage to concrete structures from corrosion of reinforcement in new structures. One of the most common methods recommended by the ACI (American Concrete Institute) is to coat the steel reinforcement to keep the structure protected from the start of construction. In this study, the compressive strength and modulus of elasticity of concrete were tested. Test for the influence of adhesion of reinforcing steel and corrosion accelerated testing to determine the initial cracking time of concrete samples in 4 types of reinforcement coatings, namely 1) epoxy 2) zinc rich 3) latex slurry cement and 4) uncoated were conducted. The concrete samples had an average compressive strength of approximately 250 kg/cm² and an average modulus of elasticity approximately 240,400 kg/cm². For test of bond between reinforcement and concrete, the sample without a coating had the best bond between reinforcement and concrete. It was found that Latex slurry cement coating can prevent corrosion of reinforcing steel in new structures better than other steel reinforcement coatings.