Study on Evaluation of Bond Performance of Concrete and Improvement

混凝土粘结性能评价及改进研究

• 批准号: 09650507
• 负责人: ROKUGO Keitetsu
• 金额: $ 2.11万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650507/
• 关键词: Concrete; Bond; Tension softening diagram; Repair; Interface; Crack; はく離

In this study, we evaluated bond performance of concrete by using the tension softening diagrams in addition to the conventional flexural bond strength and improved the bond performance. The bond performance of joints under shear force as well as under tension forces was investigated. The fracture behavior of repair materials for concrete structures was analyzed through FEM with the tension softening diagrams.The concrete joint surfaces were roughened by means of a shot blast method, a water jet method and a wash out method with a paper sheet containing retarder. The roughness of the joint surfaces was quantified by using the power spectrum, the fractal dimension and the- total surface area. The bond performance of joints was evaluated through the flexural bond strength, the fracture energy and the shape of the tension softening diagrams. After the comparison of these parameters, it was concluded that the tension softening diagrams were efficient.The size effect on the flexural bond strength of concrete was investigated through experiments and numerical analysis. It was found that the size effect was remarkable when the bond performance at joints was poor.he shrinking and cracking behavior of repair materials for concrete structures was investigated. The cracking in repair materials and the delamination on the interfaces due to the shrinking were numerically analyzed and the results coincided with the experimental ones. The efficiency of the numerical analysis with tension softening diagrams at interfaces was confirmed. It was pointed out that the surface treatment at vertical joint surface (end surface of repair materials) was important because the treatment gave a large influence on the shrinking and cracking behavior of the repair materials.

在本研究中，我们在常规抗弯粘结强度的基础上，采用拉伸软化图对混凝土的粘结性能进行了评价，提高了混凝土的粘结性能。研究了节理在剪力和拉力作用下的粘结性能。采用有限元法和张力软化图对混凝土结构修补材料的断裂行为进行了分析。采用喷丸法、喷水法和含缓凝剂的纸张冲洗法对混凝土接缝表面进行了粗化处理。利用功率谱、分形维数和总表面积对接头表面粗糙度进行了量化。通过弯曲结合强度、断裂能和拉伸软化图的形状来评价接头的结合性能。通过对这些参数的比较，得出张力软化图是有效的。通过试验和数值分析，研究了尺寸对混凝土抗弯粘结强度的影响。当接头粘结性能较差时，尺寸效应显著。对混凝土结构修补材料的收缩开裂性能进行了研究。数值分析了由于收缩引起的修补材料开裂和界面分层现象，结果与实验结果吻合。验证了界面处张力软化图数值分析的有效性。指出垂直接合面（修补材料的端面）的表面处理对修补材料的收缩和开裂行为有很大影响，因此表面处理是重要的。

项目成果

鎌田敏郎: "コンクリートと鋼繊維の付着特性に関する基礎的研究" セメント・コンクリート 論文集. No.52. 754-759 (1998)

Toshiro Kamata：“混凝土和钢纤维粘合性能的基础研究”《水泥和混凝土会议录》第 52. 754-759 期（1998 年）。

S.ISIHARA: "Experimental Study on the Mechanical Behavior in Construction Joints of Concrete Structures" Fracture Mechanics of Concrete Structures. Vol.1. 783-792 (1998)

S.ISIHARA：“混凝土结构施工缝力学行为的实验研究”混凝土结构断裂力学。

Rokugo, K and M.Kunieda: "Fracture Mechanics and Repair Materials" Concrete Jounrnal, JCI (Japanese). Vol.36, No.7. 62-64 (1998)

Rokugo, K 和 M.Kunieda：“断裂力学和修复材料”混凝土杂志，JCI（日语）。

Kamada, T., Arakawa, T., Kurihara, N.and Rokugo, K.: "Evaluation of Steel-fibre/Concrete Interfacial Bond Properties in the Multiple-fibre Pull-out Test" Cement Science and Concrete Technology (Japanese). No.52. 754-759 (1998)

Kamada, T.、Arakawa, T.、Kurihara, N. 和 Rokugo, K.：“多纤维拉拔试验中钢纤维/混凝土界面粘结性能的评估”水泥科学与混凝土技术（日语）。

S.ISHIHARA: "Experimental Study on the Mechanical Behavior in Construction Joints of Concrete Structures" Fracture Mechanics of Concrete Structures. Vol.1. 783-792 (1998)

S.ISHIHARA：“混凝土结构施工缝力学行为的实验研究”混凝土结构断裂力学。