Title A Study on the Mutual Effect of Carbonation and Chloride Binding in Mortar
Authors So Seung-Young
Page pp.139-145
ISSN 12269107
Keywords chloride ; chloride bound ; CO2 ; pore solution ; cation ; carbonation ; combined attacks
Abstract Chloride ions exist in the vicinity of the steel, introduced into the concrete through mix ingredients such as unwashed chloride-contaminated coastal sands used as fine aggregates and enter concrete from outside sources during the service life of structures, the steel will show pitting corrosion even though the pH of the environment is higher than 11.0. Carbonation of cover concrete is considered one of the most common culprits in the corrosion of steel in concrete. It breaks down the passive film and allows the steel to corrode actively at a high rate.
The main objective of this study is to investigate the interrelationship between chloride binding and speed of carbonation by conducting an accelerated carbonation test on mortar which chlorides were mixed. It was found that chloride-bearing mortar were accelerated carbonation and the Friedel's salt were broken down in carbonation.