An Evaluation of Technical, Economic and Environmental Performance of Bitumen Emulsion as A Sustainable Alternative to Cutback Bitumen for Prime and Tack Coats in Road Construction
Keywords:
Bitumen Emulsion, Cutback Bitumen, Sustainable Road Construction, Interface Shear Strength, VOC Emissions, Life-Cycle Cost Analysis.Abstract
The global push for sustainable infrastructure has necessitated a critical re-evaluation of traditional road construction materials, particularly the transition from solvent-based cutback bitumen to aqueous bitumen emulsions. This research provides a comprehensive comparative analysis of the technical, environmental, and economic performance of these binders when utilized for prime and tack coat applications. Utilizing a hybrid methodology, the study integrates laboratory-based experimental testing—specifically focusing on penetration depth and interface shear strength (ISS)—with life-cycle cost analysis (LCCA) and volatile organic compound (VOC) emission modeling.
The technical results indicate that while cutback bitumen (MC-30) maintains a marginal 29% advantage in penetration depth within low-porosity granular bases, cationic bitumen emulsions (CSS-1h and CRS-2) demonstrate superior performance in curing efficiency and mechanical bonding. Specifically, bitumen emulsions achieved traffic-ready states in approximately 3.5 hours compared to the 24-hour window required for cutbacks, while interface shear strength was found to be up to 28% higher in emulsion-treated samples. From an environmental perspective, the adoption of emulsions resulted in a 97.4% reduction in VOC emissions and an 85.6% decrease in application energy requirements. Economic modeling further supports this transition, revealing a 33.9% reduction in total unit costs per metric tonne when accounting for material procurement, heating, and construction delay variables. The study concludes that bitumen emulsion is not merely an eco-friendly alternative but a superior engineering binder that enhances pavement durability while meeting stringent modern sustainability mandates.
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