多盐耦合腐蚀环境下混凝土性能劣化规律

doi:10.12068/j.issn.1005-3026.2023.04.017

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (4): 581-589.DOI: 10.12068/j.issn.1005-3026.2023.04.017

多盐耦合腐蚀环境下混凝土性能劣化规律

贺盛^1,2,3,4，覃志笛^1,2,3，李玉滔⁵，于鹏^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； 5. 广西新发展交通集团有限公司，广西南宁530022)

发布日期:2023-04-27
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:
广西重点研发计划项目(AB19259013); 国家自然科学基金青年基金项目(12102095); 广西高层次人才项目(T3030097947); 广西创新驱动重大专项(桂科AA18118055); 广西青年创新人才科研专项(桂科AD20159080).

Performance Degradation Law of Concretes in the Multi-salt Coupling Corrosion Environment

HE Sheng^1,2,3,4， QIN Zhi-di^1,2,3， LI Yu-tao⁵， YU Peng^1,2,3

1. Institute of Civil and Architectural Engineering， Guangxi University， Nanning 530004， China; 2. Guangxi Key Laboratory of Disaster Prevention and Engineering 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; 5. Guangxi Xinfazhan Communications Group Co.， Ltd， Nanning 530022， China.

Published:2023-04-27
Contact: YU Peng
About author:-
Supported by:
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摘要/Abstract

摘要： 为了探究实际工业化学腐蚀环境对混凝土物理力学性能的影响规律，在氯盐、硫酸盐及镁盐环境下，进行了半浸泡与全浸泡的现场暴露试验，并在室内进行了相应的腐蚀模拟试验，研究不同水胶比、腐蚀质量分数及干湿周期对混凝土质量、抗压强度、动弹性模量及损伤层厚度的影响.结果表明:半浸泡混凝土与室内模拟试验混凝土相对质量、相对动弹性模量、抗压强度均随时间先上升后下降，损伤层厚度随时间持续上升.全浸泡方式对混凝土的劣化损伤远低于半浸泡方式，全浸泡方式延长了半浸泡方式各转折点所需时间.水胶比增大、质量分数提升及干湿周期缩短均促进Friedel盐、钙矾石及氢氧化镁等生成，加速混凝土劣化.腐蚀性离子渗入混凝土的先后顺序为:氯离子、硫酸根离子、镁离子.

关键词: 化学腐蚀；多盐耦合；现场暴露；室内模拟；相对动弹性模量

Abstract: In order to explore the effect of the actual industrial chemical corrosion environment on the physical and mechanical properties of concretes， the site exposure tests of half immersion and full immersion were adopted in the chlorine， sulfate and magnesium salt environments， and therewith the corresponding corrosion simulation tests were carried out in the laboratory. The effects of different water-binder ratios， different corrosion concentrations and different dry-wet periods on concretes’ quality， compressive strength， dynamic elastic modulus and thickness of the damaged layer were studied. The results showed that the relative mass， relative dynamic elastic modulus and compressive strength of half-immersed concretes and laboratory simulated concretes all increase first and then decrease with time and the thickness of the damaged layer continues to increase with time. The degradation damage of full-immersed concretes is much lower than those by half immersion， and the time required for each turning point by full immersion is prolonged. With the increase of the water-binder ratio， concentration， and shortening of the dry-wet period， it is easier to produce Friedel’s salt， ettringite， and magnesium hydroxide in concretes， and accelerate the deterioration of concretes. The order of corrosive ions infiltrating into concretes is:chloride ions， sulfate ions and magnesium ions.

Key words: chemical corrosion; multi-salt coupling; site exposure; laboratory simulation; relative dynamic elastic modulus

中图分类号:

TU528

贺盛，覃志笛，李玉滔5，于鹏. 多盐耦合腐蚀环境下混凝土性能劣化规律[J]. 东北大学学报（自然科学版）, 2023, 44(4): 581-589.

HE Sheng， QIN Zhi-di， LI Yu-tao5， YU Peng. Performance Degradation Law of Concretes in the Multi-salt Coupling Corrosion Environment[J]. Journal of Northeastern University(Natural Science), 2023, 44(4): 581-589.

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多盐耦合腐蚀环境下混凝土性能劣化规律

Performance Degradation Law of Concretes in the Multi-salt Coupling Corrosion Environment

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