Asphalt Mixture Performance through Dune Sand Incorporation and Lucobit 1210A Bitumen Modification for Sustainable Road Construction

Abstract

The use of dune sand in road and geotechnical structures demands extra attention due to its abundance and eco-friendly nature. This study delves into the science of flexible pavement mixture, initiating a transformative exploration within asphalt mixtures by highlighting pioneering innovations and the strategic integration of dune sand as a gravel alternative. A revolutionary modification involves the use of the common polymer "Lucobit 1210A," enhancing the cohesion of the mixture with polyethylene. The primary objective of the study is to track mechanical changes by adjusting the mix formula with varying proportions (5%, 10%, 15%, 20%) of dune sand instead of gravel (0/3). Introducing Lucobit 1210A polymer at a 3% ratio to the base bitumen class 40/50 is done while considering temperature and mixing parameters. Various tests: Marshall, Duriez, rutting, and PCG, were conducted to examine (stability, flow, pressure resistance, rutting susceptibility, and void distribution). The incorporation of local dune sand leads to a series of mechanical improvements during bitumen modification. Flow increases remarkably by 32 % compared to the conventional mixture, with a substantial 17 % increase in wear resistance at a 15 % dune sand ratio, considered sufficient. The narrative doesn't stop there. The fatigue resistance of the asphalt mixture evolves, making it suitable for roads with moderate traffic congestion. These results pave the way for adopting this exceptional asphalt integration in road construction projects. In an era of technological advancement and environmental concern, such findings signify a new era in road construction that aligns technical excellence with sustainability aspirations