Investigation Of The Bond Properties Between BFRP Bars And Basalt Fiber Recycled Concrete Under Multiple Factors

In order to reduce the environmental pollution caused by construction waste and waste of resources, uses the basalt fiber reinforced recycled concrete instead of common concrete, basalt fiber reinforced polymer/plastic(BFRP) bars instead of ordinary steel research by the center drawing experiment. Consider three kinds of factors that the replacement ratio of the recycled aggregate, the diameter and surface characteristics of the BFRP bars to affect the performance of the bond, based on theoretical analysisand to build the bond-slip constitutive relation. The work as follow.(1) In this paper, through the concrete mechanics performance test(cube compressive strength test, splitting tensile test, axial compression test and modulus of elasticity test) research shows that adding fiber can improve the mechanical properties of recycled concrete indicators, especially the splitting tensile strength and elastic modulus; with the increase of recycled aggregates, the mechanical properties of basalt fiber reinforced concrete is gradually reduced.(2) Through 14 groups of drawing specimens we research the influence that different replacement ratio of recycled aggregate and the different diameter and surface characteristics of BFRP to the bonding property between BFRP and the regenerative concrete of basalt fiber. Finally, we obtain the curve of bond-slip stress, and analysis the failure mechanism and mode. The results showed that with the increase of the replacement ratio of recycled aggregate, the peak of bond stress decreasing with the increase of diameter of BFRP, the influence of recycled coarse aggregate to bonding property is decreasing, the peak slippage that correspond the ultimate bond stress increase gradually, but the overall trend change little; The influence that type of reinforcement surface to the bonding property between regenerative concrete of basalt fiber and BFRP tendons is serious.(3) Obtain the curve of bond-slip from the final result of test. With related researching at home and abroad as well as the results of this experiment, eventually model of bond-slip is proposed on the basis of non-linear regression. Compared with the measured values of test, the results shows that the fitting and experimental values are excellent in matching.