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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

34卷

期数:

2017年04期

页码:

57-64

栏目:

出版日期:

2017-07-28

文章信息/Info

Title:

Revised Chloride Ion Diffusion Models of Concrete Bridges Near Coastal Areas Considering Surface Chloride Ion Concentration

作者:

何化南，冯 叶，张冠华，王佳伟

大连理工大学海岸和近海工程国家重点实验室

Author(s):

HE Hua-nan, FENG Ye, ZHANG Guan-hua, WANG Jia-wei

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology

关键词:

混凝土结构; 氯离子扩散模型; Fick第二定律; 表面氯离子质量分数; 水胶比

Keywords:

concrete structure;  chloride ion diffusion model;  Fick second law;  surface chloride ion concentration;  water-binder ratio

分类号:

-

DOI:

-

文献标志码:

A

摘要:

为了研究沿海距海岸距离为5~40 km钢筋混凝土桥梁的氯离子扩散规律，建立与之相适应的氯离子扩散模型，对沈山（沈阳—山关海）高速公路沿线25座钢筋混凝土桥梁进行钻芯取样，研究了表面氯离子质量分数和水胶比的关系。引入表面氯离子质量分数实测值与拟合值的比例系数，建立表面氯离子质量分数和距海岸距离的数学关系，结合氯离子表观扩散系数的时间效应对Fick第二定律的解析解进行修正。通过对比实测值和修正模型的拟合值验证模型的适用性。结果表明：构件表面氯离子质量分数与水胶比成正比，比例系数服从正态分布的统计规律；构件表面氯离子质量分数随着距海岸距离的增加而逐渐减小，二者呈指数关系；由修正后的氯离子扩散模型计算得出的拟合值能够包络大多数实测值，拟合结果偏安全。

Abstract:

In order to research the chloride ion diffusion law of reinforced concrete bridges whose distance from the coast was 5-40 km, a proper chloride ion diffusion model was built, and 25 bridges along Shenyang-Shanhaiguan highway were sampled by the method of drilling core. The relationship between surface chloride ion concentration and water-binder ratio was analyzed. The proportionality coefficient of the measured values and the fitted values of surface chloride ion concentration was brought in to establish the mathematical relationship between surface chloride ion concentration and distance from the coast. The analytic solution of Fick second law was modified combining the time effect of apparent diffusion coefficient of chlorine ion. The revised model was verified by comparing the measured values and the fitted values. The results show that the surface chloride ion concentration of the component is proportional to water-binder ratio, and the proportionality coefficient follows the statistical law of normal distribution. The surface chloride ion concentration of component decreases with the distance from the coast increasing and they follow the exponential relationship. The fitted values calculated by the modified chloride ion diffusion model can envelop most of the measured values, and the fitted results are partial safety.

参考文献/References:

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更新日期/Last Update: 2017-07-20