In　order　to　reduce　the　chloride　ion　content　in　recycled　aggregates,　nano　SiO2　solution　was　used　to　soak　the　recycled　aggregates.　On　this　basis,　16　sets　of　C40　recycled　aggregate　concrete　mix　proportions　were　designed　with　the　considering　of　mineral　admixtures　adding.　And　the　7　d,　28　d　compressive　strength,　28　d　electric　flux,　Cl-　diffusion　coefficient　of　recycled　aggregate　concrete　were　measured.　It　was　indicated　that　Cl-　in　recycled　aggregates　would　increase　the　7　d　compressive　strength　of　concrete,　and　slightly　reduce　the　28　d　strength,　but　degrade　the　impermeability　of　concrete　significantly.　Actually,　the　chlorine　content　of　the　aggregate　was　significantly　reduced　after　nano　SiO2　solution　modification.　The　mechanical　properties　and　Cl-　permeability　resistance　of　recycled　concrete　would　be　effectively　improved　with　the　combined　effect　of　aggregate　modification　and　mineral　admixtures　adding.　And　the　combination　of　30%　fly　ash　and　8%　silica　fume　had　the　best　optimization　effect,　which　the　Cl-　permeability　coefficient　was　reduced　by　85.6%　compared　to　the　non　mixed　material　group.　Based　on　the　multiple　interfaces　theory　and　Cl-　diffusion　mechanism　of　chlorine　containing　recycled　aggregate,　the　‘infiltration　type’　Cl-　diffusion　model　was　derived　for　predicting　the　Cl-　content　of　chlorine　containing　recycled　aggregate　concrete　components　at　any　age　of　service.　©　2024　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.