Research on bonding properties between rebar and recycled concrete under different corrosion degree

Objectives: To speed up the green development of domestic concrete industry, it is necessary to know the viscosity of reinforced concrete. Materials and methods: Through the treatment of steel bars with different corrosion degree (0%, 1%, 2%, 4%), the bonding properties of them and recycled concrete were compared, and the influence of corrosion on the bonding properties was analyzed. Results and discussion: The results show that: 1) Improve the degree of rust, the peak value of average bond stress increases first and then decreases under the condition that the replacement rate of reproduced coarse bone is not changed; 2) When the replacement rate of regenerated coarse bone is changed, the peak value of average bond stress will also increase first and then decrease with the increase of steel corrosion degree; 3) Under the given regenerated coarse aggregate replacement rate, the average curves of recycled concrete with different rust degrees are basically consistent with the calculated curves, and have a good fitting effect. Conclusions: It can be concluded that the increase of steel corrosion degree will improve the bond performance of recycled concrete, but this effect will not continue to increase with the increase of rust degree.