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通过中心拉拔试验,研究了修复层材料(普通混凝土及应变硬化水泥基复合材料(SHCC))、SHCC修复层横向钢筋配筋率和冻融等因素对钢筋与混凝土黏结滑移性能的影响.结果表明:在相同的浇筑条件下,相对于普通混凝土修复的试件,SHCC修复试件的极限黏结强度约降低5.7%,峰值滑移约提高34%,试件发生拔出型破坏;随着SHCC修复层中横向钢筋配筋率增加,试件的极限黏结强度提高,界面裂缝宽度大幅度降低,破坏时修复层表面呈现多缝开裂特征,裂缝宽度为0.03~0.08mm.SHCC基体良好的抗冻能力,以及SHCC修复层与既有混凝土之间良好的界面黏结性能,能够减小冻融对钢筋与混凝土黏结性能的影响.
Through central pullout tests, the effects of repaired layer materials (ordinary concrete and strain hardening cementitious matrix composites (SHCC)), transverse reinforcement reinforcement ratio of SHCC repair layer, and freeze-thaw on the bond-slip properties between steel bars and concrete were studied. The results show that under the same pouring conditions, the ultimate bond strength of SHCC repaired specimens decreases about 5.7% and the peak slip increases about 34% SHRC repair layer horizontal reinforcement reinforcement ratio increases, the specimen’s ultimate bond strength increases, the interface crack width is greatly reduced, the destruction of the surface of the repair layer presents a multi-slit fracture characteristics, crack width of 0.03 ~ 0.08mm.SHCC matrix good resistance Freezing ability and the good interfacial bonding between SHCC repaired layer and existing concrete can reduce the influence of freeze-thaw on the bond performance between reinforced concrete and concrete.