The　autoclaved　aerated　concrete　(AAC)　blocks　are　becoming　increasingly　favored　as　infill　material　for　masonry　structures　due　to　their　advantageous　characteristics,　including　a　low　mass　ratio,　excellent　thermal　insulation,　and　energy　absorption.　However,　the　susceptibility　of　AAC　to　fragmentation　and　low　strength　subject　to　blast　loads　pose　risks　to　human　safety.　In　response,　polyurea,　known　for　its　exceptional　protective　properties,　has　emerged　as　a　viable　solution　for　enhancing　the　blast　resistance　of　AAC　masonry　walls.　The　effectiveness　of　polyurea　reinforcement　under　blast　load　was　investigated　through　a　series　blast　tests　of　full-scale　wall　specimens.　The　specimens　consisted　of　one　unreinforced　wall,　three　single-sided　polyurea　reinforced　walls,　and　one　double-sided　polyurea　reinforced　wall.　The　findings　indicate　that　the　unreinforced　masonry　wall　experienced　catastrophic　damage，when　subjected　to　near　explosion　of　small　equivalent　TNT.　Conversely,　the　specimen　blast　resistance　and　fragment　dispersion　were　significantly　improved　by　both　single-sided　and　double-sided　polyurea　reinforcement.　A　finite　element　(FE)　model　is　established　and　validated　by　the　displacement　data　and　damage　obtained　from　tests.　Furthermore,　the　protective　effect　of　polyurea　reinforced　AAC　masonry　wall　under　different　blast　loads　was　investigated.　The　damage　assessment　was　conducted　and　the　corresponding　damage　level　diagram　was　established，providing　a　practical　reference　for　the　design　of　polyurea　reinforced　AAC　masonry　walls　with　blast　resistance.　©　2024　Elsevier　Ltd