Comparative Study on Chloride Ion Deposition Patterns in Surface Layers of Coastal Concrete Structures

YANG Haicheng; XIE Jingchao; ZHENG Zhimiao; GAI Shibo; LIU Jiaping

doi:10.7643/ issn.1672-9242.2025.10.016

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (10) : 132-142. DOI: 10.7643/ issn.1672-9242.2025.10.016

Environmental Test and Observation

Comparative Study on Chloride Ion Deposition Patterns in Surface Layers of Coastal Concrete Structures

YANG Haicheng¹, XIE Jingchao^{1, *}, ZHENG Zhimiao¹, GAI Shibo¹, LIU Jiaping²

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Abstract

Since buildings in coastal areas are prone to chloride ion erosion, the work aims to study the deposition patterns of surface chloride ions in offshore concrete structures in the northern and southern seas of China and the affecting factors. Literature review, on-site sampling and actual measurement, and mathematical regression analysis were employed to collect and analyze data on salt spray concentration, chloride ion deposition rate, and surface chloride ion deposition amount. Based on 244 data values of salt spray concentration and chloride ion deposition rate in offshore areas obtained from the literature review, it was found that wind speed, air temperature, wave height, and wind-wave period were positively correlated with salt spray contraction and chloride ion deposition rate. The correlation coefficients of wind speed and wave height were both greater than 0.7, and their proportional relationship with surface chloride ion deposition amount was consistent. The average values of salt spray concentration, chloride ion deposition rate, and surface chloride ion deposition amount in the Bohai Sea and the northern part of the Yellow Sea were 38.07 μg/m³, 34.61 mg/(m²·d), and 0.18% respectively, while the corresponding average values in the southern seas were about 2.4 to 2.6 times those in the northern seas. Based on the measured data of 143 samples, the variation law between the distance from the sea and the surface chloride ion deposition amount is explored, and a distance-time-varying mathematical model of the surface chloride ion deposition amount in the concrete of the sampling area is constructed, providing data support and reference for the anti-corrosion design of buildings in coastal areas.

Key words

chloride ion deposition amount / salt spray concentration / chloride deposition rate / environmental parameters / regional differences

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YANG Haicheng, XIE Jingchao, ZHENG Zhimiao, GAI Shibo, LIU Jiaping. Comparative Study on Chloride Ion Deposition Patterns in Surface Layers of Coastal Concrete Structures[J]. Equipment Environmental Engineering. 2025, 22(10): 132-142 https://doi.org/10.7643/ issn.1672-9242.2025.10.016

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