In　order　to　further　improve　the　utilization　rate　of　waste　concrete　and　promote　the　application　of　recycled　concrete　bearing　blocks　in　severe　cold　areas,based　on　the　analysis　of　the　physical　properties　of　recycled　aggregate,the　effects　of　100%　recycled　coarse　aggregate　replacement　rate,water-binder　ratio,water　consumption　and　fly　ash　content　were　considered,and　the　mix　ratio　of　C30　recycled　concrete　was　designed　by　orthogonal　tests　to　prepare　MU10　recycled　concrete　load-bearing　blocks.　By　analyzing　the　mechanical　properties　of　MU10　recycled　concrete　load-bearing　blocks,the　optimal　mix　ratio　of　MU10　recycled　concrete　load-bearing　blocks　was　determined,and　the　frost　resistance　of　MU10　recycled　concrete　load-bearing　blocks　was　verified　by　environmental　simulation　box.　The　results　show　that　compared　with　natural　aggregate,recycled　aggregate　has　a　rougher　surface,with　some　old　cement　mortar　attached.　It　has　the　characteristics　of　low　density,high　porosity,water　absorption　and　mud　content,and　the　crushing　index　is　about　twice　that　of　natural　aggregate.　The　optimal　mix　ratio　of　MU10　recycled　concrete　load-bearing　blocks　is　1　172　kg　/　m3　recycled　coarse　aggregate,578　kg　/　m3　natural　river　sand,400　kg　/　m3　cement,100　kg　/　m3　fly　ash　and　150　kg　/　m3　water.　Its　compressive　strength　is　11.　4　MPa　and　flexure　strength　is　2.　1　MPa,which　can　be　used　for　load-bearing　and　seismic　resistant　masonry　structures.　After　50　freeze-thaw　cycles,the　quality　loss　and　strength　loss　of　MU10　recycled　concrete　load-bearing　block　are　1.　2%　and　18.　1%,respectively.　The　frost　resistance　meets　the　requirements,and　it　can　be　used　as　a　new　wall　material　in　severe　cold　areas.　©　2024　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.