This　study　utilizes　recycled　sand　and　shell　sand　to　replace　sea-sand　in　seawater　sea-sand　recycled　aggregate　concrete　(SSRAC)　and　explores　their　dynamic　compressive　properties.　A　total　of　28　sets　of　specimens　were　designed,　and　their　stress-strain　curves　under　different　strain　rates　were　analyzed.　The　findings　indicated　that　the　dynamic　increasing　factor　(DIF)　of　peak　stress　in　SSRAC　reached　its　peak　at　a　50%　replacement　ratio　of　recycled　sand,　exhibiting　a　3.9%　to　7.7%　increase　compared　to　a　0%　replacement　ratio.　Conversely,　there　was　an　overall　decreasing　trend　in　the　DIF　when　the　replacement　ratio　of　shell　sand　increased.　Using　recycled　sand　resulted　in　an　average　reduction　of　approximately　45%　in　the　elastic　modulus　of　the　interfacial　transition　zone　(ITZ),　while　the　introduction　of　shell　sand　slightly　increased　that　of　it.　Finally,　considering　strain　rate　effects,　a　dynamic　compressive　prediction　model　for　SSRAC　with　different　types　of　fine　aggregates　was　established.　©　2024　Informa　UK　Limited,　trading　as　Taylor　&　Francis　Group.