| 摘要: |
| 对6个混凝土试件进行楔入劈拉试验,劈裂后采用环氧树脂注胶技术修复试件，然后再次对试件进行楔入劈拉试验，对比两次试验中试件的破坏界面和断裂参数.结果表明：修复后试件破坏界面未发生在黏结界面；试件起裂韧度平均增幅为4706%，失稳断裂韧度、断裂能也有所提高，这说明注胶修复技术能够有效推迟裂缝的再开展，改善混凝土的断裂性能.建议将起裂韧度作为评定注胶修复效果的断裂参数，研究成果可为注胶修复混凝土结构的工程应用提供依据. |
| 关键词: 楔入劈拉法 注胶修复技术 双K断裂参数 断裂能 |
| DOI：103969/j.issn1007 9629201306022 |
| 分类号: |
| 基金项目:“十一五”国家科技支撑计划项目(2009BAJ28B00)；国家自然科学基金资助项目(51008235) |
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| Wedge Splitting Tests on Fracture Properties of Epoxy Repaired Concrete |
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LU Zhou dao, SUN Hui, YU Jiang tao, ZHANG Yuan miao
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Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092,China
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| Abstract: |
| Wedge splitting tests on six concrete specimens fabricated with fine grain concrete were carried out. After the initial splitting test, the cracked prisms were repaired with epoxy resin and split again. Based on the test results, the fracture energy, double K fracture parameters and failure interface of prototype specimens and repaired specimens were analyzed and contrasted. The results indicate that the failure interface of repaired specimens does not occur in the bonding area and the fracture capability and carrying capacity of the repaired specimens are remarkably improved. It has been shown that epoxy injection is an adequate method for repairing concrete cracks. It is recommended that the initial fracture toughness be used in the evaluation of the effect of epoxy injection technique. The results prove that the epoxy injection technique can be applied in repairing concrete. |
| Key words: wedge splitting method epoxy injection technique double K fracture parameter fracture energy |
