γ-aminopropyltriethoxy　silane　organic　layered　double　hydroxides　(LDHs)　and　SBS　were　combined　into　LDHs/SBS　composite　to　improve　anti-ageing　performance　of　SBS　modified　bitumen　(SMB).　XPS　and　SEM　showed　that　organic　LDHs　(OLDHs)　was　successfully　grafted　onto　SBS,　and　OLDHs　could　be　more　evenly　distributed　in　SBS,　which　was　conducive　to　improve　the　anti-degradation　capability　of　SBS.　Compared　with　SBS　and　LDHs/SBS　composite,　the　interaction　between　OLDHs/SBS　composite　and　bitumen　was　stronger,　resulting　in　the　better　stabilization　of　SBS　and　LDHs　in　bitumen.　Furthermore,　OLDHs/SBS　composite　could　enhance　the　high-temperature　property　of　SMB.　SMB　became　hard　and　brittle　during　ageing,　the　physical　and　rheological　properties　were　remarkably　deteriorated.　LDHs/SBS　and　OLDHs/SBS　composite　could　alleviate　the　damage　of　ageing　on　the　high-　and　low-temperature　performance　of　SMB　and　enhance　the　anti-ageing　capacity,　particularly　OLDHs/SBS　composite.　Then,　the　improvement　mechanism　of　OLDHs/SBS　and　LDHs/SBS　composite　on　the　anti-ageing　capability　of　SMB　was　analyzed　at　microscopic　scale.　LDHs/SBS　and　OLDHs/SBS　composite　could　hinder　the　infiltration　of　oxygen　into　bitumen　and　decrease　the　oxygen　content,　and　simultaneously　decelerate　the　oxygen　diffusion　rate　in　bitumen.　The　synergistic　combination　of　these　two　functions　conspicuously　diminished　the　probability　of　oxygen　colliding　with　bitumen　or　SBS,　which　relieved　the　ageing　of　bitumen　and　the　degradation　of　SBS,　and　ultimately　improved　the　anti-ageing　capability　of　SMB.　Furthermore,　due　to　the　better　stability,　the　effectiveness　of　OLDHs/SBS　composite　was　more　notable　than　LDHs/SBS　composite,　OLDHs/SBS　composite　demonstrated　superior　improvement　on　the　anti-ageing　capability　of　SMB　than　LDHs/SBS　composite.　©　2024