Evaluation of Flexible Pavement Using LDPE as a Binary Binding Material

Abstract

Asphalt, a critical component of road infrastructure, faces challenges related to durability, flexibility, and environmental impact. Bitumen is the most important but expensive component of Asphalt. Our project has explored the integration of low-density polyethylene (LDPE) in bitumen as a cost-effective and sustainable approach to improve asphalt properties. Bitumen tests and asphalt testing, performance evaluations, and other relevant assessments such as statistical modeling aim to quantify the impact of LDPE on bitumen. The results obtained by mixing 0% (neat mixture), 2%, 4%, 6% and 8% have demonstrated that addition of LDPE gives significant enhancements in key asphalt’s and bitumen’s properties. Improvement in Marshall Stability, reduction of Marshall Flow and improved thermal resistance mean LDPE can be a good binary material. The thesis interprets these findings, emphasizing their relevance to research objectives, and compares results with existing literature while addressing any encountered limitations. Moreover, the research has presented a cost-effective and sustainable strategy through LDPE-modified bitumen to enhance asphalt performance. Statistical Modelling has helped us find the optimal LDPE percentage that reduces bitumen content from 3.5% to 3.2%. Cost Analysis has showed that with recommended asphalt composition (that contains optimal LDPE percentage) we can improve asphalt properties and reduce cost by 7.5%. Our Statistical model can be used to calculate optimal percentages for required asphalt characteristics. Our solution meets seven of total sixteen Sustainable Development Goals (SDGs). The recommendations highlight practical applications of the findings, showcasing the potential economic benefits and environmental sustainability. The study also suggests avenues for future research to optimize the LDPE-bitumen combination for diverse asphalt compositions.