Study on the bonding properties of dual-substitution waste glass concrete with steel bars

The interaction between waste glass concrete and rebar has attracted significant attention. To ensure adequate bond performance in engineering applications, this study conducted 72 pull-out tests on waste glass concrete and steel reinforcement. The effects of glass powder replacement ratio, glass sand replacement ratio, water-cement ratio, and rebar diameter on bond performance were analyzed. The test results indicate that the average bond strength of the specimens decreases with increasing rebar diameter. Under the dual replacement approach, when the replacement rate of glass powder is 15 % and the water-to-cement ratio is no less than 0.45, the average bond strength decreases as the glass sand replacement ratio increases. However, when the water-cement ratio is less than 0.45, the average bond strength initially increases and then decreases. When the glass sand replacement ratio reaches 60 %, the average bond strength decreases with increasing glass powder replacement ratio. Based on the model proposed by Orangun, the effects of glass sand fine aggregate and the spacing between reinforcing bars on bond strength are considered. A new predictive model for the average bond strength between waste glass concrete and steel bars is proposed, and verified through experimental results.