Abstract

Abstract
Reliance on non-renewable natural resources in pavement construction poses environmental and sustainability challenges, hence possible incorporation of wastes becomes novel. This study investigates the performance of asphalt modified with glass waste and eggshell powder as alternative fillers. The materials were selected due to their distinct compositions: glass, predominantly silica-based, enhances stiffness which prevent cracks and reduces premature pavement distress, while eggshell, rich in calcium carbonate, improves adhesion and moisture resistance of pavement. Glass waste was collected, grounded and sieved through 0.075mm, also eggshell was collected, washed, dried, pulverized and sieved through the 0.075mm as required. XRD/SEM analysis was performed on the wastes to confirmed their silicate and calcium carbonate content. Marshall asphaltic concrete samples were prepared using the conventional fillers and tested for the optimum bitumen content determined as 6.53%. The optimum bitumen content was used to produce the modified asphalt with combined glass waste and eggshell as fillers at (0, 6, 12 and 18%) proportions. The modified samples were tested for stability, flow, indirect tensile strength (ITS), and moisture susceptibility. All proportion’s result met the AASHTO and Nig. Min. of works specifications, with TSR values exceeding the AASHTO minimum of 80%, indicating excellent resistance to moisture-induced damage. Notably, the inclusion of eggshell powder improved the mixtures' anti-stripping properties compared to glass dust alone. Therefore, glass waste and eggshell can be combined and incorporated into asphalt mix as fillers up to 18% and will reduce the environmental challenges of wastes, cost-effective asphalt, promoting resource conservation and sustainability. Further studies are recommended to evaluate other engineering performance parameters.

Key words: Key words: Asphaltic Concrete, Glass waste, Eggshell, Mineral Fillers, Waste Management, stability, Flow, Indirect Tensile Strength (ITS), Moisture Susceptibility.