Chloride Ion Diffusion Characteristics of Recycled Fine Aggregate Mortar under Freeze-Thaw Cycles
ZHAO Yan
ZHU Xuejun
JIN Kairong
HAN Jingyun
WANG Dezhi
Abstract：Chloride ion diffusion behavior of recycled fine aggregate(RFA)mortar under freeze-thaw cycle was studied through chloride rapid migration test(RCM)and COMSOL simulation,and the effects of recycled fine aggregate and fly ash on the chloride ion diffusion performance of recycled fine aggregate mortar were discussed.The results show that the chloride ion migration coefficient of RFA mortar determined by RCM method increases with the increase of RFA substitution rate and decreases with the increase of fly ash substitution rate;The chloride diffusion coefficient of in RFA mortar under freeze-thaw cycle increases with the increase of RFA substitution rate,and first decreases and then increases with the increase of fly ash substitution rate,and the chloride ion diffusion resistance in 3%NaCl solution is better than that in tap water.The numerical simulation further reveals the diffusion law of chloride ions during the phase change process of freeze-thaw cycles.
Keywords：recycled fine aggregatepore structurefreeze-thaw cyclechloride ion diffusionnumerical simulation
Publication Date：2025-12-30
Online Publishing Date：2026-01-08(First online date of this platform, not the publication date of the document)
Pages：9( 1199-1206,1273 )