盐碱环境下氯化物侵蚀对混凝土桥梁耐久性的影响

摘要/Abstract

摘要： 为解决西北地区盐碱环境中钢筋混凝土桥梁的腐蚀及耐久性问题,通过现场调研西北地区盐碱环境中桥梁病害问题、土壤和桥梁中氯离子的分布情况,运用修正Fick第二定律和有限元模拟拟建桥梁各部位的氯离子扩散规律,并预测了桥梁的耐久性寿命,探讨了提高混凝土强度和保护层厚度等措施对桥梁耐久性寿命的提升效果。结果表明,盐碱环境中表层土壤氯离子含量最高,服役桥梁存在多种病害,下部结构最易受到氯离子侵蚀。服役桥梁下部结构承台、桥墩和桩基的耐久性寿命分别为55.3、63.1和91.5 a,通过合理提升混凝土强度、提高保护层厚度等可以使桥梁的耐久性达到要求。

关键词: 混凝土桥梁, 盐碱环境, 氯离子侵蚀, 耐久性, 寿命预测

Abstract: In order to solve the problem of erosion and durability of reinforced concrete bridges in saline alkali environment in Northwest China, through field investigation of bridge diseases in saline alkali environment in Northwest China and the distribution of chloride ion in soil and bridges, the chloride ion diffusion law of each part of bridge was analyzed by modified Fick’s second law and finite element simulation, and the durability life of a proposed bridge was predicted. The improvement effects of measures such as improving concrete strength and protective layer thickness on the durability life of bridge were discussed. The results show that the chloride ion content in the surface soil is the highest in saline alkali environment. There are many diseases in the service bridge, and the substructure is the most vulnerable to chloride ion erosion. The durability life of substructure bearing platform, pier and pile foundation of service bridge is 55.3, 63.1 and 91.5 a respectively. The durability of bridge can meet the requirements by reasonably improving concrete strength and protective layer thickness.

Key words: concrete bridge, saline alkali environment, chloride ion erosion, durability, life prediction

中图分类号:

TU528

蔺鹏臻, 任锦波. 盐碱环境下氯化物侵蚀对混凝土桥梁耐久性的影响[J]. 硅酸盐通报, 2024, 43(9): 3235-3243.

LIN Pengzhen, REN Jinbo. Effect of Chloride Erosion on Durability of Concrete Bridges in Saline Alkali Environments[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3235-3243.

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