Role of fiber-reinforced chip seal interlayers in asphalt pavement bonding strength

This study investigates the influence of seal coat parameters – rubber-modified asphalt content, fiber content, fiber length, and chip content – on the bonding characteristics of asphalt pavement layers. Employing a full factorial experiment and utilizing direct shear and tensile tests, the research identified the optimal material composition for improving interlayer bonding. The results showed that fiber content notably enhanced shear strength, whereas rubber-modified asphalt content significantly influenced tensile strength. The inclusion of fibers in the seal coat notably increased bonding strengths by up to 45.6% and 61.5% in shear and tensile strengths, respectively, demonstrating considerable performance enhancements at room temperature. In addition, the study explored the economic advantages of fiber-reinforced chip seal treatments, revealing substantial improvements in interlayer strength, particularly under diverse temperature conditions. This research contributes valuable insights into optimizing reinforced bituminous interfaces for asphalt pavements, offering a promising avenue for enhancing pavement durability and performance.