Effect of waste glass powder on mechanical performance of hot mix asphalt.

To reduce construction materials cost, the search for waste materials that harm the environment to reuse them optimally reduces the consumption of raw materials and withdraws large quantities of waste generated from domestic and industrial activities, in addition to energy subsidies. Among these wastes especially non-biodegradable solid waste is waste glass. Interestingly, when glass is crushed into sand-like particle sizes, it exhibits aggregated physical properties like natural sand. For this reason, the idea of using crushed glass waste as an alternative to natural aggregate in asphalt mixture when constructing asphalt pavement emerged. This research primarily aims to investigate the possibility of waste disposal by using Waste Glass Powder (WGP) material in HMA mixture. In addition to the influence of adding WGP material on the performance of HMA mixture. To achieve the aim of this research, many important goals and objectives were conducted, which can be summarised as using Marshall method to determine Optimum Asphalt Content (OAC) of Reference Hot Mix Asphalt (RHMA) and Optimum Glass Content (OGC) of Glassy Hot Mix Asphalt (GHMA). Finally, the RHMA and GHMA mixtures were prepared to study the property variation with the optimum percentage of materials in HMA mixture. To investigate the comparative performance of the two types of HMA mixtures, some tests were performed, including Marshall Method Test (MMT), Indirect Tensile Strength (ITS) test, Tensile Strength Ratio (TSR) test, and Oxidative Ageing Test (OAT). The results showed that OAC for RHMA mixture was 5.2% of the total weight of HMA mixture and OGC for GHMA mixture was 15% by weight of the filler material. The volumetric and mechanical properties of modified mixture are improved compared to RHMA mixture; as Mixture Bulk Density (MBD) increased, Air Voids in Total Mixture (VTM) decreased, Voids in Mineral Aggregate (VMA) decreased, Voids Filled with Asphalt (VFA) increased, Marshall Stability (MS) increased, Marshall Flow (MF) decreased, and Marshall Quotient Stiffness (MQS) increased. The sensitivity of thermal cracking, moisture damage, and oxidative ageing also decreased. Also, it was noted from the results that waste glass reusing in asphalt pavement using WGP material in HMA mixture with mixing ratios of 15% by weight of filler material is possible. It also leads to improved performance of asphalt pavement. [ABSTRACT FROM AUTHOR]