Abstract
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 behavior 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 exposed 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 aggregate 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.
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Acknowledgements
The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 11832013 and 51878350), the Fundamental Research Funds for the Central Universities (No. B2102 02023), the Young Scientific and Technological Talents to Support Project of Jiangsu Association for Science and Technology (No. 027), the Water Conservancy Science and Technology Project of Jiangsu Province (No. 2020 017), the Postdoctoral Research Funding Program of Jiangsu Province (No. 2021K133B), the Ningbo Science and Technology Innovation Project (No. 2020Z040), the Nantong Science and Technology Plan Project (No. JC 2020120), the Open Research Fund of Changjiang River Research Institute of Changjiang Water Resources Committee (No. CKWV2021879/KY).
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Da, B., Li, Y., Yu, H. et al. Effect of Carbonation and Drying-Wetting Cycles on Chloride Diffusion Behavior of Coral Aggregate Seawater Concrete. J. Ocean Univ. China 21, 113–123 (2022). https://doi.org/10.1007/s11802-022-4847-z
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DOI: https://doi.org/10.1007/s11802-022-4847-z