UV-Resistant Polymer–Nanomaterial Systems for Asphalt Pavements Exposed to Intense Solar Radiation: A Mechanistic Review and Experimental Framework

Asphalt pavements exposed to intense solar radiation experience coupledthermal and photochemical aging that can stiffen the binder, degrade polymermodifiers, reduce stress relaxation, and promote cracking. Polymer modificationcan improve elasticity and resistance to permanent deformation; however, longterm performance depends on polymer chemistry, dispersion, compatibility, and exposure conditions. This review examines elastomeric polymers and UV-screening or barrier nanomaterials as candidate components for asphalt binders used in high-solar-radiation environments.The proposed research direction is to evaluate styrene–butadiene–styrene (SBS)or styrene–butadiene rubber (SBR) in combination with selected nanomaterials,including titanium dioxide (TiO2), zinc oxide (ZnO), and layered silicates. Thepaper presents a mechanistic framework linking UV dose, heat transfer, viscoelastic response, and chemical aging indicators. It also proposes a laboratoryprogramme involving controlled UV and thermal conditioning, rheological and spectroscopic characterization, and mixture-level performance testing. The equationsare intended to guide experimental design and data interpretation; they are not asubstitute for material-specific measurements. No experimental results are claimed.The principal conclusion is that candidate formulations should be selected through balanced evaluation of rutting resistance, fatigue performance, low-temperature relaxation, moisture susceptibility, workability, and aging resistance.