Chloride Diffusion Model and Diffusion Law Analysis of Concrete Based on GEM Equation

SHEN Caihua; CHEN Wei; CHEN Xiaofeng; XIE Fei; LYU Shiming; XU Xiuliang

doi:10.13204/j.gyjzG20122608

Volume 52 Issue 7

Oct. 2022

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SHEN Caihua, CHEN Wei, CHEN Xiaofeng, XIE Fei, LYU Shiming, XU Xiuliang. Chloride Diffusion Model and Diffusion Law Analysis of Concrete Based on GEM Equation[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(7): 151-158. doi: 10.13204/j.gyjzG20122608

Citation:

SHEN Caihua, CHEN Wei, CHEN Xiaofeng, XIE Fei, LYU Shiming, XU Xiuliang. Chloride Diffusion Model and Diffusion Law Analysis of Concrete Based on GEM Equation[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(7): 151-158. doi: 10.13204/j.gyjzG20122608

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Chloride Diffusion Model and Diffusion Law Analysis of Concrete Based on GEM Equation

doi: 10.13204/j.gyjzG20122608

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Zhejiang Provincial Institute of Communications Planning,Design & Research, Hangzhou 310012, China;
3. Poly Changda Overseas Engineering Co., Ltd., Guangzhou 510623, China

Received Date: 2020-12-26
Available Online: 2022-10-28

Abstract

Abstract

The prediction of chloride diffusion in concrete is the key and difficult point of durability prediction of concrete in chloride environment. Nernst-Einstein equation was used to improve the general formula of GEM equation. Combined with test data, the chloride diffusion process equation of concrete with different void characteristics and different thicknesses of protective layer was derived. The influence of concrete curing age, mineral admixture and fiber content on the diffusion index n in the equation was analyzed. The life prediction model, with chloride ion concentration as the control target, predicted the critical porosity requirements of concrete under different concrete cover thicknesses with 100-year design life. When the minimum cover thickness was 6 cm, the concrete porosity should be controlled below 8%. The prediction results were basically reasonable. The prediction method could provide a reference for the optimal design of chloride corrosion durability of coastal concrete structures.
- GEM equation,
- durability,
- chloride ion,
- diffusion index

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References(26)

References

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