| 摘要: |
| 【目的】通过新老混凝土的黏结剪切试验，考察不同界面处理方法对新老混凝土黏结滑移的影响。【方法】以自密实混凝土为新混凝土材料，通过自行设计的推出式剪切试验装置，考虑不同粗糙度（自然光滑面、粗糙面Ⅰ和粗糙面Ⅱ，对应粗糙度分别为0，2.0，3.2 mm）和不同界面剂处理（不涂界面剂的粗糙面Ⅰ及涂刷界面剂Ⅰ和界面剂Ⅱ）对新老混凝土黏结界面的影响，利用测定的沿受力方向上新老混凝土各点处的应变值，推算黏结面上黏结应力的分布，进而分析不同界面处理下新老混凝土的黏结滑移关系。【结果】新老混凝土界面处黏结应力分布呈三段式曲线发展；自然光滑界面的黏结试件上，黏结应力传递不均匀；涂抹界面剂的试件黏结应力在加载端处增长较快；涂刷界面剂与否对新老混凝土黏结滑移影响不大；通过回归分析得到了黏结滑移的本构关系函数式。【结论】粗糙度处理对新老混凝土黏结滑移影响较大，涂刷界面剂的影响较小，回归得到的黏结滑移本构关系可供实际工程参考。 |
| 关键词: 自密实混凝土 黏结滑移 粗糙度 界面剂 黏结应力 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（51278124） |
|
| Effect of interface treatment on bond-slip behavior of self-compacting concrete and old concrete |
|
CHEN Feng,ZHENG Jian-lan
|
| Abstract: |
| 【Objective】Shear experiment of new and old concretes was conducted to study the effect of interface treatment on bond-slip behavior of self-compacting concrete and old concrete.【Method】Using the self-compacting concrete as new concrete,effect of different roughness (smooth surface,rough surface Ⅰ,and rough surface Ⅱ with according average filling sand depths of 0,2.0,and 3.2 mm) and interface treatment (no binder,binder Ⅰ,and binder Ⅱ) on bounding interface was studied using push-out shear testing device.The strains of new concrete at different sites along the loading direction were measured to calculate the bond stress of interface and analyze the bond-slip behavior of old and new concretes.【Result】The distribution curve of bonding strength at the interface of old and new concretes had three stages.The bond stress transfer on the interface without roughness was not uniform.The bond stress of interface with binders increased fast in the loading end.Interface agent had minor effect on bond-slip behavior.The constitutive relation of bond stress-slip was also obtained through regression analysis.【Conclusion】Roughness had larger effect on the bond-slip behavior than interface agent.The obtained constitutive relation of bond stress-slip could be used as reference for practical structural design. |
| Key words: self-compacting concrete bond-slip roughness interface agent bond stress |
