2026-10-09T07:53:00Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34069236 2026-10-05T10:44:32Z category_610 portal_316 item_type_3 month_year_10_2026

Supplementary file 1_Protocol-dependent aging responses of polyurethane-bound pavement composites under thermo-oxidative, hygrothermal, and UV exposure.docx Leilei Han (13278081) Zhengxin Wu (11838391) Zhiqing Zhu (590630) Functional Materials accelerated aging durability assessment hygrothermal aging moisture-assisted deterioration polyurethane pavement composite thermo-oxidative aging ultraviolet aging <p>Polyurethane-bound pavement composites offer high mechanical performance, but accelerated durability rankings can depend on how aging is imposed and which material response is measured. This study compared a moisture-curing methylene diphenyl diisocyanate-based polyether polyurethane binder and dense PC-13 composite under thermo-oxidative, hygrothermal, continuous ultraviolet (UV), intermittent UV, and intermittent UV–immersion exposure. A 20 h thermo-oxidative group enabled duration-matched comparison with 20 h hygrothermal aging, and replicated mixture testing at 480 h supported Welch tests with Holm correction across the three UV protocols. At 20 h, thermo-oxidative aging reduced binder tensile strength to 13.52 MPa versus 18.13 MPa after hygrothermal aging and also produced lower elongation at break and splitting strength. Gel permeation chromatography and tetrahydrofuran-insoluble measurements showed that soluble-fraction molecular-mass changes did not reproduce the mechanical severity ranking. At 480 h, intermittent UV–immersion produced the lowest mean dynamic stability, flexural strain, and splitting strength, with retentions of 38.31%, 25.59%, and 52.57%, respectively. Flexural strain distinguished all three UV protocols, while the matched intermittent comparison showed a significant additional loss of dynamic stability when water immersion replaced 1 h of dark conditioning. Because continuous and intermittent schedules accumulated different UV-on times, those comparisons are interpreted only as whole-protocol contrasts. The results demonstrate that durability assessment of polyurethane-bound pavement composites requires protocol-specific, multi-indicator interpretation.</p> 2026-10-05T10:44:32Z Dataset Dataset 10.3389/fmats.2026.1964302.s001 https://figshare.com/articles/dataset/Supplementary_file_1_Protocol-dependent_aging_responses_of_polyurethane-bound_pavement_composites_under_thermo-oxidative_hygrothermal_and_UV_exposure_docx/34069236 CC BY 4.0