Anti-Chloride Ion Permeability of Alkali-ActivatedSlag-Fly Ash Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0554

Abstract

Abstract: This paper focused on optimizing the anti-chloride ion permeability of alkali-activated slag-fly ash (AASF) concrete. The electric flux method was used to test anti-chloride ion permeability, combined with SEM microstructure analysis, systematically studied the mechanism and influences of various variables on the anti-chloride ion permeability of concrete with fly ash content, alkali equivalent (calculated as Na₂O equivalent), water glass modulus and water-binder ratio as the key control variables. The results show that the electrical flux value of the test specimen is only 763.87 C under the conditions of a mix ratio of 25% (mass fraction) fly ash, 5% alkali equivalent, 1.2 water glass modulus, and 0.40 water-binder ratio, which is 58.20% lower than that of the benchmark cement-based concrete. This verifies that the AASF concrete with this mix ratio has the optimal anti-chloride ion permeability. A chloride ion permeation model with fly ash content as the main influencing factor was established based on the above test results and Fick's second law. The calculated value of chloride ion diffusion coefficient has an error of within ±5% compared to the measured value after comparing and analyzing with the test results.

Key words: alkali-activated slag-fly ash concrete, anti-chloride ion permeability, electrical flux method, microstructure, chloride ion permeation model

CLC Number:

TU528

CHEN Linlu, CHEN Xin, LI Jiaxu, WANG Hongfeng. Anti-Chloride Ion Permeability of Alkali-ActivatedSlag-Fly Ash Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3725-3733.

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