AUTHOR=Huang Guohua , Wu Binzhong , Shen Yin , Wang Li , Li Guoping 

TITLE=Comparative experiment of steel bar corrosion at concrete construction joints

JOURNAL=Frontiers in Materials

VOLUME=Volume 9 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.1094696

DOI=10.3389/fmats.2022.1094696

ISSN=2296-8016

ABSTRACT=Construction joint may lead to increased corrosion of reinforcement in concrete and become a durability weakness of concrete structure. This study presents a comparative electrochemically accelerated corrosion tests to assess the effect of construction joints on chloride-induced corrosion of reinforcing steel in concrete. The comparative experiment studied four types of rebars commonly used in marine and offshore concrete structures; two environmental conditions, namely the marine environment and the offshore tidal environment; and two forms of construction joints. Experimental results showed that except for epoxy-coated steel bars, the most severe corrosion of experimental steel bars in concrete specimens all occurred at the joints, while the corrosion in non-joint sections of steel bars was relatively uniform and less. The rust amounts of rebars at the joint sections were greater than that of the non-joint sections and the average ratio was 1.76. In addition, the corrosion of rebars at the joints under wet–dry cycle condition was more severe than under immersion conditions.