| 引用本文: | 李林,丁士君,李镜培,李鹤.不同环境条件下混凝土构件氯离子侵蚀试验[J].哈尔滨工业大学学报,2016,48(12):28.DOI:10.11918/j.issn.0367-6234.2016.12.003 |
| LI Lin,DING Shijun,LI Jingpei,LI He.Chloride ion erosion experiment of concrete members under different environmental conditions[J].Journal of Harbin Institute of Technology,2016,48(12):28.DOI:10.11918/j.issn.0367-6234.2016.12.003 |
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| 不同环境条件下混凝土构件氯离子侵蚀试验 |
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李林1,2, 丁士君3,李镜培1,2, 李鹤1,2
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(1.岩土及地下工程教育部重点实验室(同济大学),上海 200092; 2.同济大学 地下建筑与工程系, 上海 200092;3.中国电力科学研究院,北京100055)
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| 摘要: |
| 为研究不同环境条件下混凝土构件氯离子侵蚀劣化规律，开展弯拉应力构件的氯离子浸泡侵蚀试验和无应力构件的盐雾侵蚀试验.基于氯离子质量分数、构件弯拉强度及弯拉应变等测试结果，研究了侵蚀时间、环境温度、应力水平、环境氯离子质量分数及侵蚀方式等因素对氯离子扩散特征和构件抗弯性能的影响.试验结果表明：浸泡环境中混凝土内部氯离子质量分数较盐雾环境高；试件内部氯离子质量分数随腐蚀时间、环境温度、环境氯离子质量分数及应力水平的增大而增大；氯离子扩散系数随应力水平和环境温度的提高而增大；在较低应力水平、较低环境温度和较短的侵蚀时间内，混凝土构件极限弯拉强度有小幅度上升趋势，然后随侵蚀时间的增长而衰减；混凝土构件的极限弯拉应变随各影响因素的增大而降低.研究结果可为钢筋混凝土构件在氯盐侵蚀环境下的耐久性评估及设计提供依据，具有一定工程实际意义.
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| 关键词: 氯离子 浸泡侵蚀 盐雾侵蚀 弯拉应力 环境温度 扩散系数 抗弯性能 |
| DOI：10.11918/j.issn.0367-6234.2016.12.003 |
| 分类号:TU528 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51178341)； 中国电力科学研究院资助项目(GC7113001,GC7114004) |
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| Chloride ion erosion experiment of concrete members under different environmental conditions |
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LI Lin1,2, DING Shijun3, LI Jingpei1,2, LI He1,2
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（1.Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education, Shanghai 200092, China; 2.Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 3.China Electric Power Research Institute, Beijing 100055, China)
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| Abstract: |
| To study the erosion degradation rule of the concrete member under different chloride ion erosion conditions, the chloride ion immersion tests for the flexural-tensile concrete member and salt spray tests for non-stress concrete member were carried out. Based on the test results of chloride mass fraction, flexural-tensile strength and flexural-tensile strain of concrete member, the effects of erosion time, environmental temperature, stress level, environmental chloride ion mass fraction and erosion pattern on the diffusion rule of chloride ion and flexural-tensile strength of concrete members were studied. The results show that, the chloride ion mass fraction in soaking environment is higher than that in salt spray environment; the chloride ion mass fraction increases with the erosion time, environmental temperature, chloride ion concentration and stress level; the diffusion coefficient increases with the increasing of the stress level and temperature; under the condition of lower stress level, lower temperature and shorter erosion time, the ultimate flexural-tensile strength of concrete members has a slight upward trend, and then it decreases with erosion time; the ultimate flexural-tensile strain of concrete members decreases while the influence factors increase. The results provide a theoretical base for the durability assessment and design for concrete member under chloride ion erosion environmental and have some practical values.
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| Key words: chloride ion immersion erosion salt spray erosion flexural-tensile stress environmental temperature diffusion coefficient flexural performance |
