Abstract
This paper presents the results of research on the flexural behavior of recycled aggregate concrete (RAC) beams. The correlation between flexural behavior and the corrosion level of longitudinal rebar was analysed. Based on theoretical analysis and experiment results, the influence of corrosion on flexural cracking moment was analysed and a model to predict the residual flexural capacity of RAC beams with corroded longitudinal rebars was established. The experimental results show that the development degree of cover cracks deepens with the increase of the corrosion level, and the experimental data also demonstrate that the strain distribution of concrete in the midspan of beams conforms to the plane section assumption better when the corrosion level is little but no longer satisfies the plane section assumption when the corrosion level is high.
Highlights
With the rapid development of social economy, the environmental pollution and resource consumption caused by the booming construction industry are becoming more and more prominent
Recycled aggregate concrete (RAC) technology is the most effective measure to solve the problem of waste concrete treatment and shortage of construction resources, and it has become a common concern of all countries in the world [3,4,5,6,7,8,9]
Mahdi et al [11] tested the flexural behavior of RAC beams, and the results show that the cracking moment of RAC beams is about 7% lower than that of natural aggregate concrete (NAC) beams
Summary
With the rapid development of social economy, the environmental pollution and resource consumption caused by the booming construction industry are becoming more and more prominent. Recycled aggregate concrete (RAC) technology is the most effective measure to solve the problem of waste concrete treatment and shortage of construction resources, and it has become a common concern of all countries in the world [3,4,5,6,7,8,9]. Xiao and Lan [10], through the flexural experiment of RAC beams, showed that the results that the cracking moment of RAC beams is close to that of natural aggregate concrete (NAC) beams under the same conditions. Mahdi et al [11] tested the flexural behavior of RAC beams, and the results show that the cracking moment of RAC beams is about 7% lower than that of NAC beams. Yang [12] deduced the calculation method of cracking moment of RAC beams and revised the plastic influence coefficient of section resistance moment. e research results of Xiao and Lan [10], Mahdi et al [11], and Sato et al [13] show that the calculation model of NAC beams can be used to predict the flexural capacity of NAC beams, but the safety reserve of capacity will be reduced
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