The　influence　of　cracks　with　different　widths　on　chloride　transmission　has　been　investigated　by　experimental　tests　using　the　method　of　rapid　chloride　migration　(RCM)　and　numerical　simulation　using　finite　element　analysis　with　software　ABAQUS.　Meso-scale　finite　element　simulation　model　has　been　developed　to　study　the　aggregate　heterogeneity.　It　is　found　that　numerical　simulation　results　are　in　good　agreement　with　the　experimental　measurements.　When　the　crack　width　is　less　than　0.05　mm,　the　influence　of　the　crack　can　be　ignored.　While　the　crack　with　width　is　in　the　range　from　0.08　mm　to　0.1　mm,　the　dispersion　accelerates　with　crack　width　increasing.　When　the　crack　width　is　larger　than　0.1　mm,　the　transmission　of　chloride　is　similar　to　the　transmission　in　the　liquid.　The　finite　element　method　verified　by　the　experimental　results　can　be　further　applied　to　systemically　explore　the　correlation　of　the　behavior　of　chloride　dispersion　with　specific　crack　width.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.