Abstract
Fibre reinforced polymer (FRP) bar reinforced recycled aggregate seawater sea-sand concrete (RASSC) structures can reasonably solve the two key problems of reinforcement corrosion and resource shortage. In this paper, the bond durability between basalt fibre reinforced polymer (BFRP) bars and RASSC in freezing-thawing environment was studied by eccentric pull-out tests. The research parameters were freezing-thawing cyclic numbers and concrete cover thicknesses. The results revealed that the bond strength between BFRP bars and RASSC decreased significantly with the increase in freezing-thawing cyclic numbers. Additionally, the bond strength increased with concrete cover thicknesses. The variation laws of slip at bond strength and bond stiffness were similar to those of bond strength. Considering the effect of freezing-thawing cyclic numbers, the equations for relative compressive strength and relative dynamic elastic modulus of RASSC were established. Considering the effects of freezing-thawing cyclic numbers and concrete cover thicknesses, the equations for bond strength, slip at bond strength, and bond stiffness between BFRP bars and RASSC were given. Furthermore, mBPE model and CMR model were calibrated.
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