海水流动性对氯离子在混凝土中扩散性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0503

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (9): 3238-3245.DOI: 10.16552/j.cnki.issn1001-1625.2025.0503

海水流动性对氯离子在混凝土中扩散性能的影响

虞爱平^1,2, 程梓宸^1,2, 李正康^1,2, 李秀鑫^1,2, 刘咏琪^1,2, 陈宣东^1,2

1.广西绿色建材与建筑工业化重点实验室,桂林 541004;
2.桂林理工大学土木工程学院,桂林 541004

收稿日期:2025-05-17 修订日期:2025-07-04 出版日期:2025-09-15 发布日期:2025-09-19
通信作者: 陈宣东,博士,副教授。E-mail:6616051@glut.edu.cn
作者简介:虞爱平(1981—),男,博士,教授。主要从事土木工程耐久性和工程材料的研究。E-mail:apyu@glut.edu.cn
基金资助:
国家自然科学基金项目(51968014);广西青年科学基金项目(2025GXNSFBA069153);广西科技基地与人才专项资助(AD25069101);广西研究生教育创新计划项目(YCSW2025413)

Effect of Seawater Fluidity on Chloride Ions Diffusion Performance in Concrete

YU Aiping^1,2, CHENG Zichen^1,2, LI Zhengkang^1,2, LI Xiuxin^1,2, LIU Yongqi^1,2, CHEN Xuandong^1,2

1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin 541004, China;
2. College of Civil Engineering, Guilin University of Technology, Guilin 541004, China

Received:2025-05-17 Revised:2025-07-04 Published:2025-09-15 Online:2025-09-19

摘要/Abstract

摘要： 为探明海水流动对氯离子在混凝土中传输行为的影响机制,本研究通过配制5倍浓度人工海水模拟真实海洋环境,设置流速为0(静止)、0.21和0.42 m/s三种侵蚀工况,结合氯离子浓度测定与XRD、SEM、压汞法(MIP)等微观测试方法开展系统研究。结果表明:海水流动性在早期显著增强了氯离子在混凝土表面的吸附作用,但随着侵蚀时间的增加,这种促进效果逐渐减弱。0.21和0.42 m/s工况下的表面氯离子浓度均显著高于静止工况。此外,长期侵蚀(180 d)后,流动工况与静止工况的氯离子浓度差异逐渐减小,表明海水流动性对氯离子在混凝土内部的扩散行为影响有限。微观机理分析表明,在侵蚀过程中钙矾石和Friedel盐生成,但未观察到钙矾石结晶引起的微裂纹,说明硫酸根离子对混凝土结构的破坏作用较弱。此外,MIP测试显示三种工况的孔径分布相近,进一步证实海水流动性对混凝土内部反应机制的影响较小。本研究揭示了海水流动环境下氯离子的传输特征及时变规律,为海洋工程混凝土结构的耐久性设计与寿命预测提供了理论依据。

关键词: 混凝土耐久性, 海水流动, 介质侵蚀, 氯离子侵蚀, 硫酸盐侵蚀

Abstract: To investigate the influence of seawater flow on chloride transport behavior in concrete, this study simulated real marine environments using artificial seawater with 5 times normal concentration. Three flow conditions were set: 0 (static), 0.21 and 0.42 m/s. A systematic study was conducted combining chloride ion concentration measurements with microstructural characterization techniques including XRD, SEM, and mercury intrusion porosimetry (MIP). The results demonstrated that, seawater flow significantly accelerated chloride ion adsorption in the concrete surface layer during the initial erosion stage (60 d), with chloride ion concentrations under 0.21 and 0.42 m/s conditions being notably higher than in static seawater. After long-term erosion (180 d), the difference in chloride ion concentration between flowing and static conditions gradually diminished, indicating that seawater flow has limited influence on chloride diffusion behavior within concrete. Microstructural analysis shows the formation of ettringite and Friedel salt during erosion, but no microcracks induced by ettringite crystallization are observed, suggesting sulfate ions play a minor role in concrete deterioration. Furthermore, MIP tests show similar pore size distributions across all three conditions, confirming that seawater flow has minimal impact on the internal reaction mechanisms of concrete. This study elucidates the transport characteristics and time-dependent patterns of chloride ions under flowing seawater conditions, providing a theoretical basis for durability design and service life prediction of marine concrete structures.

Key words: concrete durability, seawater flow, medium erosion, chloride ion erosion, sulfate erosion

中图分类号:

TU528

虞爱平, 程梓宸, 李正康, 李秀鑫, 刘咏琪, 陈宣东. 海水流动性对氯离子在混凝土中扩散性能的影响[J]. 硅酸盐通报, 2025, 44(9): 3238-3245.

YU Aiping, CHENG Zichen, LI Zhengkang, LI Xiuxin, LIU Yongqi, CHEN Xuandong. Effect of Seawater Fluidity on Chloride Ions Diffusion Performance in Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3238-3245.

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海水流动性对氯离子在混凝土中扩散性能的影响

Effect of Seawater Fluidity on Chloride Ions Diffusion Performance in Concrete

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