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This study developed UV‐responsive microcapsules to enhance the self‐healing properties of asphalt, addressing the limitations of low survival rates and single‐release mechanisms in current encapsulated rejuvenators. The microcapsules, featuring a urea‐formaldehyde shell embedded with polydopamine‐coated black phosphorus nanosheets (BP/DA) and microalgae bio‐oil as the core, can convert solar energy into thermal energy, promoting proactive self‐healing in asphalt materials. BP/DA expands the microcapsules' light absorption range, enhancing their photothermal conversion efficiency. When incorporated into styrene‐butadiene‐styrene (SBS)‐modified asphalt at a 1.5% dosage, the microcapsules (BP/DA/MC) improved the mechanical properties: ductility increased by 13.7%, softening point rose by 2%, and penetration decreased by 3.3%. The storage modulus (G′) at 46 and 64°C increased by 35.9% and 24.3%, respectively, compared to SBS asphalt. Additionally, the ductility self‐healing rate of BP/DA/MC/SBS asphalt improved by 209.7%, with a healing index (HI) of 78.16%. The microcapsules also demonstrated excellent photothermal conversion, increasing the asphalt's temperature by 22.6% under identical lighting conditions. This research offers a new method for developing intelligent self‐healing asphalt with multi‐mechanism activation, providing theoretical support for future third‐generation microcapsule‐based asphalt with remote‐controlled release and activation response. [ABSTRACT FROM AUTHOR]

Aluminum industrial refractory waste pose a huge risk to the environment, and hence a safe resource utilization is mandatory to build a green industrial construction industry. Herein, a thermoplastic polyester elastomers‐spent refractory material (TPEE‐SRM) modifier having a two‐layer structure of "protective layer‐functional layer" was developed. Scanning electron microscopy and surface area analysis revealed that Eps used in the protective layer formed a dense film layer (50% decrease in specific surface) with a 97.7% sequestration of fluoride. As the reaction occurred in an organic solution, fluoride posed no risk to the environment. TPEE functional layer itself melted and dissolved with asphalt under high‐temperature conditions, and hence it established a strong interfacial interaction with asphalt. This led to an increase of 99.73% in the complex modulus (G*) and 41.75% in the rutting‐resistance performance (Jnr) of the TPEE‐SRM composite modified asphalt than that of the pristine styrene‐butadiene‐styrene (SBS) modified asphalt. The performance of the TPEE‐SRM/SBS composite modified asphalt after 10 years of use was also evaluated by conducting high pressure aging simulation tests. The linear amplitude scanning test results showed a 27.1‐fold increase in Nf 5.0%. Owing to the efficient and green modification method, the newly designed TPEE‐SRM modifier poses great application prospects and feasibility for designing advanced functional modified asphalt for construction and highway industries alongside a suitable disposal aspect for SRM. [ABSTRACT FROM AUTHOR]

Utilizing efficient and cost‐effective modifiers is essential for the development of high‐performance asphalt materials. In this study, a polydopamine (PDA) chelated cobalt ion (Co2+)‐assisted in situ growth strategy was employed to anchor nanoporous zeolite imidazolium salt framework‐67 (ZIF‐67) on polyester (PET) fiber substrates for the preparation of styrene‐butadiene‐styrene block copolymer‐modified asphalt (SBS‐MA). Experimental results indicated that optimal fiber incorporation of 1.5% led to the best interfacial interaction at the modified asphalt fracture section. ZIF‐67 nanoporous structure acted as an organic–inorganic hybridization interfacial layer to enhance the fiber–asphalt interfacial interaction. The adhesion work of the modified fiber with SBS‐MA increased by 42.12%. Furthermore, the adhesion work, peeling work, and compatibility ratio of modified asphalt with aggregates were also improved. Similarly, the complex modulus of the 1.5% ZIF‐67–PDA–PET/SBS‐MA at 46°C was increased by 131.30% in comparison with that of the pristine SBS‐MA. More importantly, the synergistic effect of the highly thermally stable PET fibers and ZIF‐67 nanocrystals improved the thermal decomposition of SBS‐MA. These results suggest that ZIF‐67–PDA–PET fiber holds great promise for application in designing novel materials for the construction industry. [ABSTRACT FROM AUTHOR]