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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (1): 58-68.DOI: 10.16552/j.cnki.issn1001-1625.2025.0672

• 水泥混凝土 • 上一篇    下一篇

盐雾环境下带接缝混凝土抗氯离子侵蚀性能研究

延永东(), 王宗豪, 陆春华, 武珂珂, 江成   

  1. 江苏大学土木工程与力学学院,镇江 212013
  • 收稿日期:2025-07-11 修订日期:2025-08-22 出版日期:2026-01-20 发布日期:2026-02-10
  • 作者简介:延永东(1982—),男,博士,副教授。主要从事可持续混凝土结构及其耐久性的研究。E-mail:yand@ujs.edu.cn
  • 基金资助:
    国家自然科学基金(52478177);国家自然科学基金(51608233)

Resistance to Chloride Ion Erosion of Jointed Concrete in Salt Spray Environment

YAN Yongdong(), WANG Zonghao, LU Chunhua, WU Keke, JIANG Cheng   

  1. Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China
  • Received:2025-07-11 Revised:2025-08-22 Published:2026-01-20 Online:2026-02-10

摘要:

为得出沿海盐雾环境下氯离子在带接缝混凝土内的侵蚀规律,本文考虑了接缝类型、侵蚀时间、材料组成等因素,开展了在盐雾环境下带接缝混凝土构件的氯离子侵蚀试验,测试了不同龄期下接缝处与非接缝处的氯离子质量分数。结果表明,在相同侵蚀时间下,接缝处的氯离子质量分数均大于非接缝处,其中直接湿接缝处的氯离子质量分数大于凿毛湿接缝处。随深度增加,混凝土内的氯离子质量分数先增大后减小,在距混凝土表面4 mm处最大。单掺结晶外加剂(CA)或复掺CA与UEA膨胀剂可以减小混凝土接缝处的氯离子质量分数,从而减弱接缝对混凝土耐久性的不利影响。非接缝处与接缝处的表观氯离子扩散系数随盐雾侵蚀时间的衰减规律一致,接缝处的表观氯离子扩散系数约为非接缝处的1.3倍。

关键词: 盐雾环境, 直接湿接缝, 凿毛湿接缝, 自愈合材料, 氯离子质量分数, 表观氯离子扩散系数

Abstract:

To investigate the chloride ion ingression mechanism in concrete with construction joints in coastal salt spray environment, chloride ion erosion tests were carried out on jointed concrete specimens in a salt spray environment, considered factors such as joint type, erosion time, and material composition, measured the chloride ion mass fraction at jointed and non-joint areas at different ages. The results show that at the same erosion time, the chloride ion mass fraction at the joint area is higher than that at the non-joint area, with the highest mass fraction at the direct wet joint. Along the concrete depth, the chloride ion mass fraction increases first and then decreases, reaching the maximum value at 4 mm deep from the exposed surface of concrete. Addition of crystalline admixture (CA) or a combination addition of CA and UEA expansive agent could both reduce the chloride ion mass fraction at the joint area, thereby mitigating the adverse effects of joints on the durability of concrete. The chloride ion diffusion coefficients at the non-joint area and joint area show the same attenuation trend with the salt spray time, the coefficient value at the joint area is approximately 1.3 times that at the non-joint area.

Key words: salt spray environment, direct wet joint, roughened wet joint, self-healing material, chloride ion mass fraction, apparent chloride ion diffusion coefficient

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