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A five-phase composite sphere model for the matrix in recycled aggregate concrete (RAC) is proposed, and a closed-form solution for the chloride diffusivity is calibrated by available experimental data.Based on a parametric study, it is found that: (1) the chloride diffusivity of RAC with Fuller gradation is always smaller than that with an equal volume fraction gradation, and (2) the chloride diffusivity of RAC decreases with an increase of the minimum aggregate diameter, whereas it increases with the old residual mortar content and the recycled aggregate replacement rate, as well as the thickness of the old ITZ.