The　influences　and　mechanisms　of　single　and　coupled　effect　of　carbonation,　dry-wet　cycles　and　freeze-thaw　cycles　on　the　durability　of　three　types　of　recycled　aggregate　concrete　were　studied.　The　compressive　strength,　chloride　ion　migration　coefficient　and　micro　pore　parameters　of　recycled　aggregate　concrete　were　tested.　The　results　showed　that　carbonation　and　dry-wet　cycles　can　improve　the　pore　tortuosity　and　reduce　the　connectivity　of　pores,　while　freeze-thaw　cycles,　coupling　of　carbonation　and　freeze-thaw　cycles,　and　coupling　of　carbonation,　dry-wet　cycles　and　freeze-thaw　cycles　can　significantly　reduce　the　pore　tortuosity　and　deteriorate　the　pore　structure.　The　key　reason　for　durability　failure　of　recycled　aggregate　concrete　in　a　complex　environment　is　the　increase　of　large　pore　volume　fraction.　When　more　factors　are　coupled,　the　increase　in　the　pore　volume　fraction　is　greater.　Based　on　the　pore　tortuosity　and　large　pore　volume　fraction,　an　integrated　pore　index　was　proposed,　and　a　prediction　model　of　compressive　strength　and　chloride　ion　migration　coefficient　of　recycled　aggregate　concrete　under　complex　environmental　factors　was　established,　which　provided　the　basis　to　evaluate　and　maintain　the　durability　of　recycled　aggregate　concrete.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.