|Table of Contents|

Study on chloride ion diffusion in marine concrete based on long-term exposure test(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年04期
Page:
115-123
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on chloride ion diffusion in marine concrete based on long-term exposure test
Author(s):
MA Chuanyi1; 2;  QU Guangzhen3;  LI Fan1; 2;  HUANG Pingming4;  SHANG Zhiqiang1;  YUAN Yangguang5
(1. Shandong Hi-speed Group Co., Ltd., Jinan 250101, Shandong, China; 2. Shandong Key Laboratory of Highway Technology and Safety Assessment, Jinan 250101, Shandong, China; 3. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, Shandong, China; 4. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 5. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China)
Keywords:
marine concrete;  long-term exposure test;  chloride ion diffusion;  durability life
PACS:
TU375
DOI:
10.19815/j.jace.2023.10014
Abstract:
In order to explore the influence of chloride ion erosion and diffusion on the durability of concrete structures under marine environment, a tracking test was carried out on concrete cube specimens exposed to corrosion for 14 years at Qingdao Jiaozhou Bay bridge exposure station, and the change law of chloride ion concentration of concrete with exposure age in different corrosion areas such as atmospheric area, splash area and water-varying area was analyzed. A time-varying model of chloride ion diffusion coefficient and chloride ion concentration on concrete surface was proposed, and the durability of reinforced concrete under marine environment was predicted. The results show that the chloride ion erosion degree of concrete in the splash area is the most obvious during the exposure period of 14 years. At the exposure age of 1, 5, 14 years, the chloride ion concentration at the depth of 4 mm in the splash area is 7.4 times, 7.6 times and 6.9 times of that in the atmospheric area, respectively. The diffusion coefficient of concrete chloride ion and the surface chloride ion concentration change significantly within 1-3 years of exposure age, and then the change gradually tends to be slow until stable. With the increase of the protective layer thickness, the durability life of the concrete structure against chloride ions gradually increases. The durability life of the concrete structure with the protective layer thickness of 70 mm is about 2 times higher than that with the protective layer thickness of 40 mm. The sensitivity of structural durability life to surface chloride ion concentration, critical chloride ion concentration and protective layer thickness increases in turn. The relevant research can provide reference for the durability design and evaluation of concrete structures in chlorine environment.

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Last Update: 2025-07-10