Using Glass Waste As Sand In Asphalt Base Course Layer

Abstract

The concept of recycling glass waste is based on using of these waste as additives or initial materials to reduce the depletion of natural resources, reduce the areas demands for waste dumps, get advantages of the distinctive characteristics of glass such as heat resistance, high durability, and not affected by water. The main purpose of this study is to determine the effect of using glass waste as sand on the characteristics of hot asphalt mix in terms of: Marshall stability and flow, stability loss, and Marshall stiffness (Marshall Quotient). In this research, mineral aggregates had brought from Al-Salima quarries near Damascus, where the grains of aggregates larger than 19 mm had rejected. Bituminous binder had brought from Banyas refinery in Tartous governorate. Glass waste was prepared from broken glass windows available locally. Two types of hot mix asphalt had designed: a reference mixture)traditional mixture), and a modified mixture by glass sand additive, where three partial replacement percentage of glass sand had studied (6-8-10)% by the weight of the mineral sand. The results of the experimental tests in this research showed that the optimum percentage of glass sand is 8%, and showed that the optimum binder content hadn't affected by this percentage (8)%, It has been also found that the modified mixture with glass sand had improved its characteristics in terms of stability, flow, Marshall stiffness, and resistance impact of water with the following percentages, respectively: (22, 17, 42, 15)%. As a result, the concept of using glass waste as sand in the asphalt base course layer would reduce the mineral aggregate percentage which is necessary to produce asphalt mixtures, with the possibility of achieving the technical conditions and specifications that required for use as an asphalt base course layer, In addition to improving the properties of the asphalt mixture.