Modification of Bituminous Mixture Using Polyethylene Granules

Authors:

Aswathy S, Biya Justin, Santo Salu, Jithin Joy

Department of Civil Engineering Bishop Jerome Institute

Kollam, India

Mrs. Thushara Raju

Assistant Professor, Dept. of Civil Engineering Bishop Jerome Institute

Kollam, India

Abstract: This research investigates the structural and economic viability of incorporating non-biodegradable plastic waste specifically High-Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) as performance-enhancing modifiers in bituminous road mixtures. Utilizing the Marshall mix design methodology, wearing course specimens were fabricated for both control and modified mixtures, evaluating three distinct HDPE/LDPE blend ratios: 75/25, 50/50, and 25/75. Com-prehensive laboratory testing reveals that the 50:50 blend ratio optimizes the synergistic properties of HDPE’s rigidity and LDPE’s flexibility, resulting in an 18.96% increase in Marshall stability and a 48.08% improvement in flow value. The results demonstrate that the dry process of integration successfully bolsters resistance to escalating traffic loads and moisture-induced damage while facilitating a significant reduction in optimum bitumen content. This study concludes that polymer-modified bituminous mixtures offer a superior, cost-effective, and sustainable solution for plastic waste management, ultimately extending the service life and durability of modern flexible pavements.