Recycled　concrete　aggregates　(RCA)　are　increasingly　being　used　in　unbound　pavement　base　and　subbase　layers,　while　the　influence　of　their　self-cementing　properties　on　the　mechanical　behaviour　has　not　been　thoroughly　studied.　In　this　paper,　the　self-cementing　properties,　permanent　deformation　and　resilient　deformation　behaviour　of　two　RCA,　NRCA　(New　RCA,　crushed　recently)　and　ORCA　(Old　RCA,　crushed　long　time　ago),　showing　significantly　different　self-cementing　properties,　after　curing　for　different　times　(1,　180,　360　and　720　days),　were　investigated　by　pH　value　measurements,　calorimeter　tests　and　repeated　load　triaxial　tests　(RLTT).　The　results　show　that　the　self-cementing　properties　can　significantly　improve　the　mechanical　behaviour　of　RCA,　which　is　comparable　to　that　of　lightly　treated　materials.　The　permanent　strains　of　NRCA,　showing　strong　self-cementing　properties,　decrease　to　a　very　low　value　quickly　after　curing　for　180　days,　and　then　stabilize.　While　the　resilient　modulus　of　NRCA　increases　continuously　with　curing　time,　up　to　the　studied　curing　time　(720　days),　4.3　times　larger　than　that　curing　for　1　day.　It　was　also　found　that　the　traffic　loads　can　damage　the　bonds　between　particles　formed　due　to　the　self-cementing　properties.　On　the　contrary,　for　ORCA,　showing　negligible　self-cementing　properties,　curing　has　no　influence　on　the　mechanical　behaviour.