Bond behavior between recycled coarse aggregate concrete and steel bar after salt-frost cycles. (30th November 2019)

• Record Type: Journal Article
• Authors: Su, Tian; Wu, Jin; Yang, Guixin; Zou, Zhenghao
• Is Part Of: Construction & building materials. Volume 226(2019)
• Page Start: 673
• Page End: 685
• Publication Date: 2019-11-30
• Subjects: Recycled coarse aggregate concrete -- Salt-frost resistance -- Pullout test -- Bond behavior -- Salt-frost cycles; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.07.301
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: 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. Abstract: 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.