Abstract: In the purpose of researching the bond strength between reinforcing steel bar and recycled concrete, we examined the influences of parameters including compressive strength and protective layer thickness of recycled concrete as well as length of anchorage and diameter of rebar on the bonding strength according to test data of the bond performance between steel and recycled concrete. We employed the least squares method to obtain the equation of bonding strength by statistical regression and verified the equation by comparing the calculation result with test data. Result demonstrated that with the increase of compressive strength and protective layer thickness of recycled concrete, the bonding strength between rebar and recycled concrete also increased; however, with the elongation of steel anchorage length, the bonding strength reduced. The bonding strength when rebar diameter was 10 mm was larger than that of other diameters. The calculated results are close to the test results, indicating that the model presented in this paper is reasonable.

Key words: recycled concrete, rebar diameter, relative thickness of protective layer, bonding strength, statistical analysis