Abstract
Abstract
The use of higher-quality materials, cost-effective construction methods, and improved roadway design can help reduce the deterioration of roads caused by increased traffic and budgetary constraints. Stone Matrix Asphalt (SMA) is an innovative asphalt mixture designed to provide high structural integrity and stability. This research uses Polyethylene (PE) waste (used water sachet) and Ball clay to enhance Stone matrix asphalt (SMA) mix properties as a bitumen modifier and filler respectively. The Marshall stability of the asphaltic concrete increased with clay content from 7.79KN to 9.95KN ranging from 20% to 100% respectively, while a linear reduction in the flow, voids in the mix and penetration values was observed with clay content. Findings suggest that an intermediate clay content percentage (60% in this case) provides better flow characteristics, while extreme percentages may result in higher flow values. The optimal clay content for achieving the lowest flow values may vary depending on the specific mix design and materials used. Also, from the samples made with the clay and PE, the Marshall stability and density of SMA improved with PE content, while a linear reduction in the flow, voids in the mix and penetration values was observed as well. Nine percent (9%) PE content mixture exhibits higher stability (12.25 KN) and better resistance to deformation, making it ideal for long-lasting and durable pavement. Moisture susceptibility test using indirect tensile strength test shows improvement with introduction of PE at 94.23% tensile strength ratio. SMA modified with PE and clay has improved engineering properties which therefore means that usage of this materials in the asphalt production for roadwork is an effective and economical way of managing waste and resources.

Key words: Stone matrix Asphalt (SMA), plastic waste, polyethylene, clay, Asphalt modification