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Performance Testing of Asphalt Binder Modified with Amine-Impregnated Zeolite and Plastic in Hot Mix Asphalt to Reduce Carbon Footprint
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2025-03-01
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[PDF-12.88 MB]
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Corporate Contributors:State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
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Edition:Final Report
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Abstract:The rise in global temperatures, driven in part by significant transportation carbon emissions, necessitate sustainable solutions for infrastructure. Traditional asphalt binders and lime additives significantly contribute to carbon emissions, and conventional liquid amine-based antistrip agents, which are used to reduce moisture damage, lose efficacy over time. This study evaluates the performance of PG 64-16 Low Carbon binder, incorporating 10% post-consumer plastic and amine-impregnated zeolite (AIMZ) as a protective carrier for liquid amines. Researchers compare this low-carbon binder to conventional PG 64-16 binder and evaluate AIMZ against amine and zeolite separately (AZ) and a commercial liquid antistrip (LAS). The study tests three aging levels (3, 5, and 7 days), simulating 4, 8, and 10 years, respectively, of field aging in Southern California. The evaluation of moisture-induced damage uses the Tensile Strength Ratio (TSR), while the Hamburg Wheel Tracking (HWT) test assesses rutting resistance (the wear from tires and loads that occurs on roads). The IDEAL Cracking Test measures cracking resistance, and the Moisture-Induced Shear-Thinning Index (MISTI) and Multiple-Stress Creep Recovery (MSCR) tests analyze moisture susceptibility and rheological properties, all of which are important factors to consider in long-term efficacy. AIMZ demonstrated higher TSR values compared to those with AZ and LAS at both 5 days and 7 days of aging levels for both binders. Rutting resistance is comparable between binders, and low-carbon binder mixtures show improved cracking resistance over time. MISTI values suggest lower moisture susceptibility for the low-carbon binder, though MSCR results suggest it is best suited for low-traffic volumes. This study indicates that AIMZ effectively prolongs liquid amine efficacy and that low-carbon binders, despite some limitations, offer environmental and performance benefits. These findings support the potential for incorporating post-consumer plastics in asphalt pavements, promoting sustainability in infrastructure.
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