Effect of Adding Different Sizes of Carbon Fiber on the Properties of Asphalt Mix

This study investigates the impact of carbon fibers of varying sizes on asphalt mixtures, focusing on improving mechanical properties and durability using the dry mix process. The bitumen grade 60/70 was used, and three fiber sizes; fine, medium, and large were tested at 0.1% to 0.5% by weight. And key performance parameters, including stability, flow, bulk density (Gmb), air voids (Pa), voids in mineral aggregate (VMA), and voids filled with bitumen (VFB), were measured. Results showed that fiber size and percentage significantly affected performance, with optimum results at 0.3% for fine fibers, 0.4% for medium fibers, and 0.5% for large fibers. Stability increased due to better micro-reinforcement, while flow, Gmb, VMA, and VFB values improved with higher fiber content. The study concludes that carbon fibers enhance asphalt mix performance, with fiber size and content optimized for specific needs, suggesting further exploration of hybrid fiber combinations for sustainable road construction.