Foam concrete is an important new building material in the fields of energy conservation and emission reduction,building environmental protection and super high-rise wall weight reduction.Considering the factors such as the diameter of steel bar,the welded steel foot and the bond length,the central pull-out test of steel bar and foam concrete is carried out.The results show that the failure mode and mechanism of bond slip between steel bar and foam concrete are different from those of ordinary reinforced concrete.The pull-out failure of the steel bars occurs mainly in the pull-out specimens,and there are two characteristic points in the curve:elastic slip point and peak slip point.However,the reinforced foam concrete specimens welded with triangular brackets have more residual slip points,and the bond performance is far better than that of the pull-out specimens of steel bars.The relative slip between steel bar and foam concrete occurs earlier,and the slip amount is large.The relative bond strength decreases with the increase of reinforcement diameter,but the increase of bond length has little effect on the bond strength.The bonding property of reinforced foam concrete meets the needs of engineering,and the reinforced foam concrete in the form of triangular truss has high applicability and reliability.
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