High-volume fly ash concrete (HVFAC) has less strength and calcium hydroxide (CH) content, making steel bars more susceptible to corrosion. This limits the application of HVFAC. Combining fiber-reinforced polymer (FRP) bars and HVFAC can effectively solve the corrosion problem and develop sustainable civil engineering. This study systematically investigates the bond performance between FRP bars and HVFAC through central pullout tests. The effects of supplementary cementitious materials (SCMs), FRP bars diameter, bond length, fly ash dosage, fiber type, rib geometric ratios, and concrete protective layer thickness on failure modes and bond characteristics are examined. The results show that the bond strength of FRP bars in HVFAC is lower than that in normal concrete (NC). However, the addition of SCMs significantly enhances the bond strength. Notably, the bond strength decreases with increasing bond length and fly ash dosage and improves with increasing concrete protective layer thickness. The strength-enhancing effect of increasing rib geometric ratios surpasses the strength-reducing effect of increasing bar diameter. A predictive model for bond strength is developed based on the effects of the concrete lug ratio and the area-to-space ratio. Additionally, a bond-slip model suitable for FRP bars and HVFAC is proposed, with model parameters calibrated using experimental data.
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