Bond behaviour of reinforcing steel bars in early age concrete. (30th September 2015)

• Record Type: Journal Article
• Authors: Song, Xiaobin; Wu, Yajie; Gu, Xianglin; Chen, Chao
• Is Part Of: Construction & building materials. Volume 94(2015)
• Page Start: 209
• Page End: 217
• Publication Date: 2015-09-30
• Subjects: Bond behaviour -- Early age concrete -- Reinforcing steel bar -- Bond strength -- Time-dependency; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2015.06.060
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: We tested the bond behaviour of early age concrete and steel bars. We considered small concrete cover to bar diameter ratios. We determined the bond strength, critical slip and shape parameters. We established time-dependent model of bond slip behaviour of early age concrete. Good agreement between model predictions and data in literature was achieved. Abstract: Concentric pull-out tests on early age concrete were conducted to quantify the bond–slip relationship. Different concrete strengths and cover-thickness-to-steel-bar-diameter ratios ( c / d ) were considered. It was found that the bond strength was proportional to the concrete compressive strength and c / d (up to a limit value of 1.39), while the slip corresponded to the peak stress and the shape parameters had weak correlations with the concrete compressive strength and c / d . A complete bond–slip model was established and verified based on test results in the literature, and good agreement was achieved.