Rebar corrosion and bond in concrete with recycled glass granules

Waste glass granules are considered cost-effective alternative materials to replace aggregates in concrete. However, the bond degradation of corroded concrete containing recycled glass granules has not been explored. This study investigated the effect of glass granules on rebar corrosion and the bond loss between rebars and concrete subjected to accelerating corrosion. The compressive strength and pore structure of the concrete were first evaluated, and the corrosion rate and pull-out testing of rebar in concrete were conducted after corrosion. The results show that, despite reducing the initial bond strength before corrosion, a high replacement of recycled glass granules improved the concrete's resistance to corrosion due to the optimized microstructure of concrete. In addition, the compressive strength of the concrete dominated the initial bond strength, which reduced with increasing the corrosion period. However, this negative effect of corrosion was weakened by increasing recycled glass granules, followed by reduced bond strength loss and rebar corrosion rate. • Increasing recycled glass granules reduced corrosion rate and bond loss of rebars. • Concrete strength dominated bond strength, which reduced with extended corrosion. • The bond loss after corrosion was related to the microstructure of the concrete. • Replacing river sand with recycled glass sand refined pore structure of concrete.