Effect of Low-Density Polyethylene on the Stripping Properties under Fatigue Loading of Binder Layer of HMA Mixtures
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Summary
This study investigates the use of low-density polyethylene (LDPE) as a modifier for hot mix asphalt (HMA) to mitigate moisture damage, specifically stripping, under fatigue loading conditions. The research is motivated by the prevalence of excessive axle traffic and moisture-induced failures in Iraq’s road network. LDPE was selected due to its low cost and local availability as plastic waste or particles. The primary objective was to determine the optimal polymer ratio that enhances the stripping resistance of the binder layer while evaluating the resulting rheological and mechanical properties of the asphalt mix. The experimental design utilized local materials, including asphalt from AL-Daurah Refinery (penetration grade 40-50, PG 64-16) and nominal 19 mm aggregate from AL-Nibaie Quarry. The aggregate gradation was designed according to the Superpave system, with Blend 3 selected for meeting control point and restricted zone criteria. The optimum asphalt content was determined to be 4.8% by weight. Five LDPE dosage levels (1%, 2%, 3%, 4%, and 5% by weight of asphalt) were prepared and compared against a control mix without polymer. The study assessed physical and mechanical properties, including penetration, viscosity, softening point, and volumetric characteristics, alongside moisture susceptibility. Results indicated that adding LDPE altered the binder’s physical properties: penetration decreased by 37%, ductility decreased by 15.3%, viscosity increased by 13.9%, and the softening point increased by 12.7%. Among the tested dosages, 3% LDPE by weight of asphalt was identified as the optimal modifier for improving stripping resistance. This specific dosage improved moisture resistance by 33.1% at 25°C and by 26.7% at 60°C compared to the unmodified mix. The study confirms that LDPE effectively enhances the durability of HMA against moisture damage, providing a viable, cost-effective solution using locally sourced recycled materials.
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| discover | success | Crossref | — | — | 1 | 2026-06-25 |
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