Abstract
The bond-slip property between the corroded steel bar and lightweight aggregate concrete (LWAC) was investigated. The effects of concrete cover, stirrups spacing, and steel bar corrosion level were experimentally studied using beam-type specimens. The results suggested that the bond strength of LWAC specimen was improved by the increase in concrete cover and the decrease in the spacing of stirrups, and the negative effect of the corrosion on bond strength was mitigated by the increasing thickness of cover and the spacing of the decreasing stirrups. The bond strength between LWAC and steel bar was negatively correlated to the corrosion level and the corrosion-induced cracking. The models for the bond degradation coefficient of LWAC specimens were established based on different forms of function, and the prediction of the exponential model showed better agreement with the test results. The model linking bond strength degradation in LWAC elements and corrosion-induced crack width was developed by considering factors including concrete covers and equivalent width of cracks.
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