多盐耦合环境下混凝土腐蚀损伤发展模型

doi:10.12068/j.issn.1005-3026.2023.10.017

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (10): 1499-1506.DOI: 10.12068/j.issn.1005-3026.2023.10.017

多盐耦合环境下混凝土腐蚀损伤发展模型

贺盛^1,2,3,4，王萧^1,2,3，于鹏^1,2,3，李玉滔^1,2,3

(1. 广西大学土木建筑工程学院，广西南宁530004； 2. 广西大学广西防灾减灾与工程安全重点实验室，广西南宁530004； 3. 广西大学工程防灾与结构安全教育部重点实验室，广西南宁530004； 4. 广西博世科环保科技股份有限公司，广西南宁530007)

发布日期:2023-10-27
通讯作者: 贺盛
作者简介:贺盛(1986-)，男，广西柳州人，广西大学讲师，博士.
基金资助:
国家自然科学基金青年基金资助项目(12102095)；广西高层次人才项目(T3030097947)；广西青年创新人才科研专项(AD20159080).

Development Model of Concrete Corrosion Damage in Multi-salt Coupling Environment

HE Sheng^1,2,3,4， WANG Xiao^1,2,3， YU Peng^1,2,3， LI Yu-tao^1,2,3

1. School of Civil Engineering and Architecture， Guangxi University， Nanning 530004， China; 2. Guangxi Key Laboratory of Disaster Prevention and Structural Safety， Guangxi University， Nanning 530004， China; 3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education， Guangxi University， Nanning 530004， China; 4. Guangxi Bossco Environmental Protection Technology Co.，Ltd.， Nanning 530007， China.

Published:2023-10-27
Contact: YU Peng
About author:-
Supported by:
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摘要/Abstract

摘要： 以SO^2-₄，Cl^-与Mg²⁺作为主要离子模拟工厂中实际恶劣化学腐蚀环境，开展现场暴露试验及室内模拟试验.研究了不同浸泡方式、水胶质量比、腐蚀溶液质量分数及干湿周期对混凝土劣化影响，采用超声波检测分析混凝土劣化程度.结果表明:在多盐耦合作用下，混凝土的损伤层厚度随腐蚀时间持续增加且速度逐渐减小.腐蚀前期Cl^-与SO^2-₄先进行反应，混凝土内外浓度差较大，腐蚀速度快；腐蚀中期镁盐参与腐蚀，导致缺陷再发展，但浓度差减小，腐蚀速度放缓.基于试验结果提出损伤发展模型，得出室内模拟试验腐蚀1.37d相当于现场半浸泡试验腐蚀1d，结果较为准确.

关键词: 混凝土;化学腐蚀;超声波检测;现场暴露试验;室内模拟试验

Abstract: The solution used in this study contained mainly SO^2-₄， Cl^-， and Mg²⁺ ions， which closely resembled the chemical corrosion environment in the factories. Concrete degradation was investigated by conducting on-site exposure tests and indoor simulation tests， studying the influences of different soaking method， water binder mass ratio， solution mass fraction， and dry-wet cycle on concrete degradation. Ultrasonic wave detection was used to analyze the degree of concrete degradation. The results showed that the thickness of concrete damaged layer increased due to the reaction， however， the growth rate decreased gradually under the multi-salt coupling corrosion. In the early stage of corrosion， Cl^- and SO^2-₄ entered the concrete and reacted with each other， causing a greater concentration difference between the inside and outside of concrete， which accelerated the invasion of corrosion ion and the corrosion rate. In the middle and late stage of corrosion， Mg²⁺ and SO^2-₄ participated in the corrosion， leading to increased defects. As the corrosion progressed， the concentration difference decreased， and the corrosion rate slowed down. Based on the experimental results， a damage development model was proposed， and it was concluded that the indoor simulation test corrosion of 1.37d was equivalent to the on-site semi-immersion test corrosion of 1d， with relatively accurate results.

Key words: concrete; chemical corrosion; ultrasonic testing; field exposure test; laboratory simulation test

中图分类号:

TU528.01

贺盛，王萧，于鹏，李玉滔. 多盐耦合环境下混凝土腐蚀损伤发展模型[J]. 东北大学学报（自然科学版）, 2023, 44(10): 1499-1506.

HE Sheng， WANG Xiao， YU Peng， LI Yu-tao. Development Model of Concrete Corrosion Damage in Multi-salt Coupling Environment[J]. Journal of Northeastern University(Natural Science), 2023, 44(10): 1499-1506.

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多盐耦合环境下混凝土腐蚀损伤发展模型

Development Model of Concrete Corrosion Damage in Multi-salt Coupling Environment

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