Bond behavior between recycled coarse aggregate concrete and steel bar after salt-frost cycles

• Published in: Construction & building materials Vol. 226; pp. 673 - 685
• Main Authors: Su, Tian, Wu, Jin, Yang, Guixin, Zou, Zhenghao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.11.2019
• Subjects: Bond behavior; Pullout test; Recycled coarse aggregate concrete; Salt-frost cycles; Salt-frost resistance; Bond behavior; Recycled coarse aggregate concrete; Pullout test; Salt-frost resistance; Salt-frost cycles
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.07.301

•The complete bond-slip curves of RAC with steel bar after salt-frost cycles were measured in this study.•The prediction model of the bond-slip between the RAC and steel bar after salt-frost cycles was established.•The influence of salt-frost cycles on bond stress distribution along with steel bars was investigated. This paper presents the experimental results of the salt-frost resistance of recycled coarse aggregate concrete (RAC) and the bond behavior of RAC with steel bar after salt-frost cycles. The results show that the mass of the RAC first increases and then decreases with increasing number of salt-frost cycles; the cubic compressive strength and the relative dynamic elastic modulus of the RAC decrease with increasing number of salt-frost cycles. The bond strength of the RAC decreases with increasing number of salt-frost cycles, while the slippage increases with increasing number of salt-frost cycles. The bond strength of the RAC after salt-frost cycles decreases more quickly and the slippage is larger than that after freeze-thaw cycles in water. The bond strength and the slippage of specimens without stirrups are lower than that with stirrups after salt-frost cycles. A prediction model of the bond-slip between the RAC and steel bar after salt-frost cycles is established, and the influence of salt-frost cycles on the bond stress distribution along with the steel bars is investigated.