Marshall properties of asphalt mixture containing garnet waste

Abstract

Waste materials have become increasingly popular for recycling due to high awareness of the environmental impact of waste disposal. Numbers and amounts of waste materials produced increase yearly and Garnet waste is one of the industrial wastes that getting attention among the mining and blasting industries. Garnet is a group of silicate minerals. Its important properties such as angular fractures and relatively high hardness, specific gravity and resistance to degradation combined with its ability to be recycled make it desirable for many industrial applications. This study aims to investigate the potential of using garnet waste as fine aggregate replacement in hot mix asphalt for asphalt pavement. The Garnet was designed to replace up to 25% aggregate in the asphalt mixture of AC14 and compare with granite aggregate as conventional asphalt sample. The Marshall mix design method was undertaken for both mixture types and detailed Marshall properties were compared i.e. volumetric properties, optimum bitumen content, stability and flow. In addition, the Garnet waste was characterized for its size distribution and chemical composition. The results show that the performance of the garnet waste aggregate is within the specification and could be potentially used as aggregates replacement in hot mix asphalt.