Performance Evaluation of Crumb Rubber and Basalt Fiber Modified Asphalt Mixes for Sustainable Flexible Pavements

This study explores the enhancement of asphalt mixtures for flexible pavements by incorporating crumb rubber (CR) at varying percentages and basalt fiber (BF) as a reinforcing agent. The research focuses on modifying bitumen using the wet process, with bitumen content adjusted from 4% to 6%, and evaluates the performance of the resulting asphalt mixtures. The investigation aims to improve the mechanical properties and durability of pavement materials under diverse environmental conditions. The methodology involves preparing Marshall specimens and conducting a series of standard tests to assess the modified bitumen and asphalt mixes. The findings reveal significant improvements in stability and load-bearing capacity with increasing CR and BF percentages, achieving up to 23.1% enhancement in strength. Additionally, the study observes a notable increase in workability and density, reaching up to 1.5% improvement, while addressing air void reduction by up to 18.9%. These enhancements suggest potential for sustainable pavement solutions, though further optimization is indicated to meet stringent durability standards. The research contributes to the development of eco-friendly asphalt materials, utilizing waste rubber and fiber reinforcement, offering insights for future pavement design and construction practices.