| 摘要: |
| 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57%，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003～008mm.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. |
| 关键词: 水泥基复合材料 应变硬化 黏结强度 拉拔试验 修复 |
| DOI：103969/j.issn1007 9629201601012 |
| 分类号: |
| 基金项目:江苏省高校自然科学研究项目（13KJB570003）；宿迁学院科研基金项目（2014KY07） |
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| Studies on Bond Slippage Properties of Concrete Specimen Repaired with Strain Hardening Cementitious Composites （SHCC） |
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ZHU Fangzhi1, WANG Penggang2, ZHAO Tiejun2, JIANG Lianjie1
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1.School of Civil Engineering and Architecture, Suqian College, Suqian 223800, China;2.School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China
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| Abstract: |
| Influence of strain hardening cementitious composite（SHCC） as repair material, transverse reinforcement rate of repair layer and frost damage on bond slippage behavior between concrete and steel bar was investigated through pull out test. Results indicate that the ultimate bond strength decreases by about 57% for the specimens repaired by SHCC and the ultimate slip deformation increases by 34%. All of the specimens fail in pull out mode （but for ordinary concrete specimens, they fail by splitting of the concrete cover）. With the increase of transverse reinforcement rate of specimens repaired with SHCC, the ultimate bond strength increases, the crack width on the surface of specimens becomes smaller. When the specimens fail, multi crack happens on the surface of repair layer and the crack width is between 003mm to 008mm. The very good frost resistance of the matrix of SHCC and the bond performance between SHCC and existing concrete reduces the influence of frost damage on the bond performance between steel bar and concrete. |
| Key words: cementitious composite strain hardening bond strength pull out test repair |
