EXPERIMENTAL INVESTIGATION ON HOT MIX ASPHALT PROPERTIES THROUGH PARTIAL REPLACEMENT OF FINE AGGREGATE WITH WASTE GLASS AND ADDITION OF WASTE PLASTICS AS ADDITIVES

Abstract

As the construction industry increasingly emphasizes sustainability, there is a pressing need to utilize waste materials to address environmental challenges, particularly the significant waste generated by conventional practices. This study investigates the effects of incorporating waste glass as a partial substitute for fine aggregate and using waste plastics as additives in hot mix asphalt (HMA). The primary objective is to evaluate how these modifications impact the properties of HMA and whether these materials can be effectively integrated into asphalt pavement. To achieve this, various HMA mixtures were prepared with specific proportions: 4%, 8%, 12%, 16%, and 20% waste glass, with 16% identified as optimal, along with 10%, 20%, and 30% waste plastics, where 10% was the best performing. The bitumen content was kept constant at 5.1%. Tests were conducted to assess mechanical properties such as Marshall stability, flow, and indirect tensile strength, in addition to durability tests for water sensitivity and moisture damage. The findings revealed that the incorporation of waste glass and plastics significantly enhanced the properties of HMA mixtures. The highest Marshall stability recorded was 9.51 kN with 16% waste glass, while the flow values remained within acceptable limits, indicating good performance. The addition of plastic also helped the mixture maintain its stability against temperature fluctuations. Durability tests demonstrated improved resistance to moisture damage and aging, suggesting that these mixtures are likely to perform well over time. In summary, this study offers valuable insights into the advantages of using waste glass and plastics in HMA mixtures. The results indicate enhancements in mechanical properties, durability, and resistance to rutting, attributed to the effective interaction between the waste materials and asphalt. These findings support the increasing focus on sustainable construction practices and promote the use of eco-friendly materials in the asphalt sector.