Effect of Waste Jute Fibers on the Mechanical Properties of Stone Matrix Asphalt Mixtures

Stone matrix asphalt (SMA), a gap-graded asphalt mix characterised by excellent durability, rutting resistance, and stone-on-stone contact, requires a strong stabilising agent to prevent binder drainage. Waste jute fibre (WJF) enhances the sustainable performance of SMA pavements. WJF, a biodegradable and renewable natural fibre, stabilizes asphalt mixtures and enhances mechanical properties while lowering environmental effects. WJF enhances SMA’s tensile strength, promotes recycling, and reduces waste, carbon, and synthetic fibre use. WJF was added in 5 mm, 10 mm, and 15 mm lengths at 0.1%, 0.3%, 0.5%, and 0.7% by weight of the mixture. This study examined the volumetric, mechanical, and design methods of WJF-reinforced SMA mix using the Marshall test, drain-down, indirect tensile strength, and compressive strength. Optimum asphalt content, air voids, VMA, and Marshall stability were improved. Fibre-containing SMA mixtures have lower bulk-specific gravity. Marshall’s stability rises and declines with fibre content. The test findings show that 0.5% WJF at 10 mm improved stability by 19.09%, ITS by 19.24%, and compressive strength by 21.36%.