Preparation of chemical-physical hybrid crosslinking double network gel composite incorporated SBS modified asphalt

The chemical–physical hybrid cross-linked double network gel poly (acrylamide-co-acrylic acid)/Sodium alginate/Fe3+ (P(AM-co-AA)/SA/Fe3+, simplified as P-gel) was synthesised by free radical polymerisation combined with hydrogen bonding and ion coordination, which in turn compounded styrene–butadiene-styrene (SBS) to prepare P-gel gel/SBS modified asphalt. FT-IR, UV, XRD SEM analyses confirmed the successful synthesis of P-gel. FM analysis revealed that volume increased after long-term aging physical, Dynamic Shear Rheometer (DSR), multi-stress creep recovery (MSCR), time sweep tests showed addition improved road performance SBS At a amount 5%, high-temperature grade (PG high temperature) asphalt from PG70 PG76 rate (64 oC) 17.08% 41.13% at stress 0.1 3.2 kPa, respectively. underlying mechanism behind these improvements mechanical properties composite different competitive relationship between ‘softening’ effect ‘strengthening’ itself temperatures. This project provides an alternative strategy for preparing enhanced applications highway construction industries.