The influence of carbonized recycled fine aggregate on the bond properties between recycled aggregate concrete and corroded rebars

14th International Conference on Concrete Engineering and Technology

Zheng, Jianlan^1 ; Ding, Jinwei^2 ; You, Fan^3

School of Engineering, Fujian Jiangxia University, Fuzhou

350108, China^1

College of Civil Engineering, Fuzhou University, Fuzhou

350108, China^2

Fujian Province Collaborative Innovation Center for Environment, Friendly and Energy-Saving High Performance Concrete, Fuzhou

350108, China^3

关键词: Bond properties;    Corroded steel bars;    Corrosion of rebar;    Pull-out strength;    Recycled aggregate concrete;    Recycled coarse aggregate;    Recycled fine aggregates;    Research problems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/431/10/102005/pdf
DOI  :  10.1088/1757-899X/431/10/102005

来源: IOP

【 摘 要 】

Recycled aggregate concrete (RAC) technology is one of the important measures for the development of green concrete, which can realize the sustainable development of architecture, resources and environment. Steel corrosion has great influence on the safety and durability of reinforced concrete structure, the research problem of bonding between corroded steel bars and RAC has important significance and engineering value. The effect of carbonized recycled fine aggregate (C-RFA) on bond behaviour between corroded rebars and RAC was studied through 28 sets of pull-out tests, were performed on RAC with recycled coarse aggregate (RCA) replacement percentage of 70%. Four carbonized recycled fine aggregate replacement percentages (0%, 20%, 30% and 40%) and four corrosion rates (0%, 1%, 2% and 4%) were considered in this study. The results show that carbonized RFA improved the peak pull-out strength of the specimens. The peak pull-out strength of the specimens with 20% C-RFA replacement percentage had only 1.02% decrease compared with those of unincorporated of RFA. When rebar corrosion rates was less than 4%, the corrosion of rebar improved peak pull-out strength of the specimen. It was found that 2% corrosion rate had the most significant effect.