首页|Effect of Carbonation and Drying-Wetting Cycles on Chloride Diffusion Behavior of Coral Aggregate Seawater Concrete

Effect of Carbonation and Drying-Wetting Cycles on Chloride Diffusion Behavior of Coral Aggregate Seawater Concrete

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Based on seawater immersion, drying-wetting cycles, carbonation and drying-wetting cycles for coral aggregate sea-water concrete (CASC) with different strength grades, the effect of carbonation and drying-wetting cycles on chloride diffusion be-havior of CASC is studied. The results show that the free surface chloride concentration (Cs), free chloride diffusion coefficient (Df) and time-dependent index (m) of CASC in the drying-wetting cycles is obviously higher than that in seawater immersion. The Df and m of CASC of carbonation and drying-wetting cycles is higher than that in the drying-wetting cycles. Carbonation increases the Df and m of CASC, which is against CASC to resist chloride corrosion. The corrosion possibility of CASC structures in different ex-posed areas is as follows: splash zone (carbonation and drying-wetting cycles) > tidal zone (drying-wetting cycles) > underwater zone (seawater immersion). Besides, the chloride diffusion rate of C65-CASC is 17.8％ – 63.4％ higher than that of C65-ordinary aggre-gate concrete (OAC) in seawater immersion (underwater zone). Therefore, anti-corrosion measures should be adopted to improve the service life of CASC structure in the oceanic environment.

coral aggregate seawater concretechloride diffusionseawater immersiondrying-wetting cyclescarbonation and drying-wetting cycles

DA Bo、LI Yipeng、YU Hongfa、MA Haiyan、CHEN Haoyu、DOU Xuemei、WU Zhangyu

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College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China

Key Laboratory of Coastal Disaster and Defence of Ministry of Education,Hohai University,Nanjing 210098,China

Nantong Institute of Marine and Offshore Engineering,Hohai University,Nantong 226300,China

Department of Civil and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

CCCC Infrastructure Maintenance Group Company Limited,Beijing 100010,China

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国家自然科学基金国家自然科学基金Fundamental Research Funds for the Central UniversitiesYoung Scientific and Technological Talents to Support Project of Jiangsu Association for Science and TechnologyWater Conservancy Science and Technology Project of Jiangsu ProvincePostdoctoral Research Funding Program of Ji-angsu ProvinceNingbo Science and Technology Innovation ProjectNantong Science and Technology Plan ProjectOpen Research Fund of Changjiang River Research Institute of Changjiang Water Resources Com-mittee

Nos.1183201351878350B21020202302720200172021K133B2020Z040JC 2020120CKWV2021879/KY

2022

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCDCSCDSCI
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2022.21(1)
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