稻壳灰再生混凝土与钢筋粘结性能试验

o study the bond performance between rice husk ash recycled aggregate concrete and steel bar, the influence of rice husk ash replacement, recycled coarse aggregate content, steel bar diameter and bond length were analyzed through central pull-out test. The relationship between bond strength and compressive strength was discussed and the theoretical analysis of bond-slip constitutive relation was made. The results show that appropriate rice husk ash replacement can enhance the bond performance between steel bar and recycled aggregate concrete. However, with the increase of the content of recycled aggregate and rice husk ash respectively, the bond performance between steel bars and concrete increases insignificantly or even decreases. The bond performance increases as steel bar diameter decrease, and changing the bond length of steel bars can improve the bond performance. The change rule of ultimate bond strength between steel bars and concrete and compressive strength is the same. A dimensionless bond-slip constitutive relation model suitable for test combination is proposed.