In　the　project　of　Speed　Skating　Hall　of　Beijing　2022　Winter　Olympic　Games,L⁃shaped　recycled　aggre⁃　gate　concrete（RAC）beam⁃slabs　are　used　in　the　stands　of　the　spectator　area.　The　replacement　rate　of　recycled　coarse　aggregate　is　30%,the　fine　aggregate　is　natural　sand,and　the　design　strength　grade　of　concrete　is　C45.The　L⁃shaped　RAC　beam⁃slabs　in　the　stands　of　National　Speed　Skating　Hall　were　studied,including　mechanical　proper⁃　ties　and　carbonation　properties.Three　full⁃scale　L⁃shaped　RAC　beam⁃slabs　were　tested.The　length　of　the　specimens　was　4120　mm,the　total　width　was　1180　mm,the　width　of　the　rib　beam　was　200　mm　and　the　height　was　498　mm,the　width　of　the　plate　was　980　mm　and　the　thickness　was　100　mm.The　stiffness,bearing　capacity,deformation　and　crack　development　of　the　specimens　under　different　loads　were　studied.The　carbonation　performance　of　4　groups　of　RAC　specimens　was　tested　for　3,7,14　and　28　days,with　three　specimens　in　each　group,and　the　specimen　size　was　100　mm　×　100　mm　×　300　mm.The　carbonation　depth　under　different　carbonation　days　was　studied.The　results　show　that　the　L⁃shaped　RAC　beam⁃slabs　meet　the　requirements　of　stiffness　and　bearing　capacity.Under　the　condi⁃　tion　of　reasonable　control　of　recycled　aggregate　content,the　carbonation　performance　of　recycled　aggregate　concrete　is　similar　to　that　of　ordinary　concrete,which　can　meet　the　requirements　of　carbonation　performance.　©　2022　Science　Press.　All　rights　reserved.