| 海洋环境下混凝土方桩使用寿命预测模型 |
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| 引用本文： | 李镜培,李鹤.海洋环境下混凝土方桩使用寿命预测模型[J].同济大学学报(自然科学版),2016,44(9):1371-1376. |
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| 作者姓名： | 李镜培 李鹤 |
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| 作者单位： | 同济大学 岩土及地下工程教育部重点实验室,上海 200092;同济大学 土木工程学院,上海 200092,同济大学 岩土及地下工程教育部重点实验室,上海 200092;同济大学 土木工程学院,上海 200092 |
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| 基金项目： | 国家自然科学基金资助研究项目(51178341)； |
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| 摘 要： | 基于Fick第二定律,建立了考虑扩散系数时变性、荷载对扩散系数影响和氯离子结合能力的氯离子扩散方程;通过求解扩散方程得到考虑多因素影响的混凝土方桩使用寿命预测模型;并分析了桩的保护层厚度、裂缝控制宽度、表面氯离子浓度和临界氯离子浓度等因素对桩的使用寿命的影响.分析结果表明:得到的氯离子扩散方程与实测数据吻合较好;对于设计使用寿命为50年的混凝土方桩,保护层厚度应大于45mm,桩身裂缝宽度不宜大于0.1mm.
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| 关 键 词： | 混凝土耐久性 钢筋混凝土方桩 氯离子扩散 使用寿命 |
| 收稿时间： | 2015/5/18 0:00:00 |
| 修稿时间： | 2016/6/27 0:00:00 |
Service Life Prediction Model of Concrete Square Piles in Marine Environment |
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| LI Jingpei and LI He.Service Life Prediction Model of Concrete Square Piles in Marine Environment[J].Journal of Tongji University(Natural Science),2016,44(9):1371-1376. |
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| Authors: | LI Jingpei and LI He |
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| Institution: | Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; College of Civil Engineering, Tongji University, Shanghai 200092, China and Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; College of Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | A diffusion equation of chloride ion in concrete was put forward based on Fick''s second law. In the equation, the influences of time dependence of chloride diffusivity, the effect of load on diffusion coefficient and chloride ion binding capacity of concrete were taken into consideration. A prediction model of service life of reinforced concrete (RC) square piles was established. The effects of cover thickness, cracking width, surface chloride ion concentration and the chloride threshold level on service life of RC square piles were analyzed. The analysis results indicate that the diffusion equation of chloride ion of this paper agrees well with the experimental data. It suggests that the cover thickness should be greater than 45 mm and the cracking width should not be greater than 0.1 mm if the design service life of RC square piles is 50 years. |
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| Keywords: | durability of concrete reinforced concrete square piles chloride diffusion service life |
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