Performance of high-rubber-content modified asphalt chip seal in wet-freezing environments

Document Type

Article

Publication Date

8-10-2025

Department

Department of Civil, Environmental, and Geospatial Engineering

Abstract

To achieve cleaner production of asphalt materials for paving, recycling waste tires has become a valuable option. The rubber from waste tires enhances pavement performance, making it an effective and sustainable solution. This study explores the feasibility of using high-rubber-content modified asphalt in hot asphalt chip seal applications under wet-freezing environments. Materials from a field construction project were used to prepare two types of chip seal samples in the lab: one using modified asphalt with 25 % crumb rubber content and the other using emulsified asphalt. The asphalt binder properties, aggregate chip retention, surface friction, and bonding strength of both chip seals were evaluated. Simulated freeze-thaw testing over 1–5 cycles was conducted to assess shear and tensile bond strength loss. Field pull-off test, smoothness, and distress evaluation were performed at the construction site. The results indicate that using high-rubber-content modified asphalt outperformed in both binder and chip seal performance tests, demonstrating improved viscosity, enhanced resistance to high and low temperatures, superior bonding strength, and reduced surface cracking. High-rubber-content modified asphalt chip seal is ideal for regions with wet and freeze-thaw conditions. The successful implementation of this study promotes cleaner production by enhancing waste tire recycling efficiency in road construction and supporting resource sustainability.

Publication Title

Journal of Cleaner Production

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