| 盐冻融环境下钢筋混凝土结构锈蚀寿命预测 |
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| 引用本文： | 彭艳周,高军,徐港,李想. 盐冻融环境下钢筋混凝土结构锈蚀寿命预测[J]. 水利水电科技进展, 2019, 39(3): 44-49 |
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| 作者姓名： | 彭艳周 高军 徐港 李想 |
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| 作者单位： | 三峡大学湖北省防灾减灾重点实验室;三峡大学土木与建筑学院 |
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| 基金项目： | 湖北省自然科学基金(2018CFB642)；国家自然科学基金(51379111) |
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| 摘 要： | 针对北方海洋环境冻融作用和氯离子侵蚀对钢筋混凝土结构的服役寿命的影响,基于Fick第二定律,建立了混凝土内综合考虑时间、温度、湿度、氯离子结合和冻融损伤效应的氯离子传输模型,并运用该模型对青岛海湾大桥桥墩混凝土进行了结构锈蚀寿命预测。结果表明:混凝土构件中钢筋对氯离子的传输具有明显的阻滞效应,氯离子在靠近保护层一侧的钢筋表面累积,而远离保护层一侧钢筋表面会产生浓度迟滞;角区较非角区钢筋表面氯离子浓度峰值更高,且浓度峰值随侵蚀时间延长而增大;角区钢筋表面氯离子浓度分布形式随侵蚀时间而变,初期钢筋表面氯离子浓度峰值在钢筋距构件正、侧表面最近处,后期转向两侵蚀面对角处;较无盐冻融环境而言,其他条件相同时,经历冻融循环作用后混凝土结构的锈蚀寿命显著降低,且角区与非角区钢筋锈蚀寿命的差异明显增大。
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| 关 键 词： | 混凝土结构；冻融损伤；氯离子；扩散；寿命预测 |
Prediction for corrosion life of reinforced concrete structures under salt freeze-thaw environment |
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| PENG Yanzhou,GAO Jun,XU Gang and LI Xiang. Prediction for corrosion life of reinforced concrete structures under salt freeze-thaw environment[J]. Advances in Science and Technology of Water Resources, 2019, 39(3): 44-49 |
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| Authors: | PENG Yanzhou GAO Jun XU Gang LI Xiang |
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| Affiliation: | Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China,Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China,Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China and Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China |
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| Abstract: | |
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| Keywords: | concrete structure freezing-thawing damage chloride ion diffusion service life prediction |
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