| 王苏岩,张所东,李璐希,洪雷.海水干湿循环作用下CFRP-高强混凝土黏结性能研究[J].,2015,55(2):165-170 |
| 海水干湿循环作用下CFRP-高强混凝土黏结性能研究 |
| Research on bond behavior of high-strength concrete with CFRP under seawater wet-dry cycles |
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| DOI：10.7511/dllgxb201502007 |
| 中文关键词: CFRP 高强混凝土 干湿循环 持续荷载 黏结性能 耐久性 |
| 英文关键词: CFRP high-strength concrete wet-dry cycles sustained load bonding performance durability |
| 基金项目:国家自然科学基金资助项目(51378089)；大连理工大学海岸和近海工程国家重点实验室基金资助项目(SL14-3-2). |
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| 中文摘要: |
| 在沿海地区，海水干湿循环成为限制CFRP 碳纤维增强复合材料 在加固混凝土结构应用中的主要因素之一．考虑结构自身荷载和海水干湿循环作用，用5% NaCl溶液模拟海水，利用发明的持载装置施加持续荷载，采用双面剪切试验方法对CFRP与高强混凝土的界面黏结性能进行了研究．结果表明 海水干湿循环作用下界面黏结性能发生显著的退化，极限荷载、剥离荷载、端部滑移、断裂能等界面参数均显著降低；而持续荷载和干湿循环耦合作用下界面黏结性能退化更加严重，黏结界面参数进一步降低．因此未考虑持续荷载作用而对CFRP-高强混凝土界面耐久性的研究将会过高地估算界面的黏结性能． |
| 英文摘要: |
| In coastal areas, one of the major factors to restrict the application of CFRP (carbon fiber reinforced polymer or plastic) in strengthening concrete structures is seawater wet-dry cycles. Considering structure load and seawater wet-dry cycles, the 5% NaCl solution was used to simulate seawater, the self-designed loading device was used to apply sustained load, and the double-sided shear test was used to study the bond behaviors of high-strength concrete with CFRP. The experimental results indicate that the bond behavior has significant degradation under seawater wet-dry cycles, and ultimate load, peel load, ultimate slip and fracture energy are all reduced. The degradation of bond behavior is more serious under the sustained load and wet-dry cycles and the parameters of bond behavior are further reduced. So the interfacial bond behavior of high-strength concrete with CFRP under wet-dry cycles will be overestimated without consideration of the sustained load in the study of durability of CFRP-high-strength concrete interface. |
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