Anti-aging and durability performance of pavement markings under multifactor coupling effects

Improving the durability of pavement markings in high-altitude, rainy mountainous regions is crucial for ensuring road safety and reducing maintenance costs. However, existing marking materials suffer from poor weather resistance and durability, and the evaluation methods do not fully account for interference from factors such as rainfall, pavement slope, and ultraviolet (UV) intensity. In this study, a two-component coating-based marking material was developed, incorporating the UV-1130 absorber and glass beads modified with hydrofluoric acid and silane coupling agents (HKGBs). An indoor experiment was designed under the coupled effects of different UV intensities, water film thicknesses, and pavement slope to comprehensively analyze how these environmental factors affect the aging resistance and durability of the marking materials before and after modification. The results show that adding the UV-1130 absorber to the marking material significantly enhances its aging resistance and durability, and a 1 wt% dosage already achieves a good enhancement effect. Conversely, increasing water film thickness and pavement slope substantially reduces the marking material skid resistance and retroreflective brightness. In addition, increasing both the marking thickness and the amount of HKGBs can improve the skid resistance of the marking material. This improvement is attributed to the crosslinked, durable marking layer formed by the reaction between the resin and the curing agent, as well as the larger bonding area and introduction of functional groups by the HKGBs, which together enhance adhesion and weather resistance.