| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Transport of Chloride Ions in Alkali-Activated Slag Mortars Under Flowing Water |
| WANG Yuanda, ZHANG Hongru*, LI Congzheng, FAN Jingyi, LIN Xujian
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| College of Civil Engineering, Fuzhou University, Fuzhou 350108, China |
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Abstract Utilizing different activators to prepare alkali activated slag cement (AAS) mortar specimens, and setting up chloride ion (Cl-) erosion environments with different water flow velocities (v) and action directions, the influence mechanism fo the Cl- erosion resistance of AAS mortar under flowing water conditions was explored. Additionally, an influence coefficient K(v) was introduced to account for the effect of v on the Cl- diffusion coefficient, and the Cl- diffusion coefficient of AAS mortar under flowing water was adjusted. The results indicate that normal flowing water causes more significant damage to microscopic morphology and pore structure of AAS mortar compared to tangential flowing water. Additionally, both the Cl- erosion depth and the Cl- diffusion coefficient (D) of AAS mortar increase with higher normal flow velocities, in contrast, as the tangential flow velocity increases, the D of AAS mortar rises first and then decreases. Furthermore, AAS demonstrated better resistance to Cl- erosion than ordinary Portland cement, and the excitation effect of water glass was stronger than that of NaOH. Finally, time-varying predictive models for Cl- concentration distribution in AAS mortar, accounting for both normal and tangential water flow velocities, were developed separately.
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Published: 10 November 2025
Online: 2025-11-10
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