The　current　trend　in　the　asphalt　industry　is　to　increase　the　utilization　of　recycled　asphalt　pavement　(RAP).　In　general,　there　are　two　types　of　RAP　binder　in　RAP　aggregates,　the　mobilized　RAP　binder　and　the　immobilized　RAP　binder.　The　former　can　be　blended　into　the　virgin　binder　to　coat　aggregates　during　asphalt　blending,　while　the　latter　can　be　treated　as　black　rocks　because　they　have　already　become　an　outer　crust　of　RAP　aggregates.　Studies　have　focused　on　the　mobilized　RAP　binder　quantification　and　the　significance　of　mobilized　RAP　binder　to　mixture　performances.　However,　it　remains　unknown　whether　the　immobilized　RAP　binder　affects　mixture　performances.　This　study　developed　a　laboratory　procedure　for　immobilized　RAP　aggregates　preparation　and　investigated　the　contribution　of　immobilized　RAP　binder　to　asphalt-aggregate　interaction　as　well　as　the　performance　of　100%　recycled　asphalt　mixtures.　The　work　of　adhesive　energy　and　the　K-B-G∗　model　were　adopted　to　characterize　the　asphalt-aggregate　interaction　for　asphalt　mortar.　Resilient　modulus　and　dissipated　creep　strain　energy　were　used　to　evaluate　the　stiffness　and　cracking　resistance　of　100%　recycled　asphalt　mixtures.　Results　showed　that　the　immobilized　RAP　binder　can　strengthen　the　asphalt-aggregate　interaction　and　improve　the　cracking　resistance　of　100%　recycled　asphalt　mixtures　by　increasing　total　asphalt　content.　However,　if　the　total　asphalt　content　remains　the　same,　the　immobilized　RAP　binder　increases　stiffness　but　decreases　the　cracking　resistance　of　100%　recycled　asphalt　mixtures.　　©　2023　American　Society　of　Civil　Engineers.