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Performance Evaluation of Marshall Mixed Asphalt Concrete-Binder Course (AC-BC) Using Modified LDPE Waste Asphalt with the Wet Method
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This study tested adding Low-Density Polyethylene (LDPE) plastic waste to road asphalt binder layers and found it improved pavement stability, with the best results at a 7% LDPE addition rate. While focused on road engineering rather than microplastic pollution, it is relevant because plastics incorporated into asphalt can fragment and shed tire-road microplastic particles into the environment over time.
The critical issue of Low-Density Polyethylene (LDPE) plastic waste and the need to improve the durability of asphalt pavement underlie this study. Until now, studies on the utilization of plastic waste have focused more on surface layers (AC-WC), while in-depth research on binder layers (AC-BC) is still very limited. The objective of this study is to analyze the effect of LDPE plastic waste utilization on the Marshall characteristics of Asphalt Concrete-Binder Course (AC-BC) mixtures using the wet mix method. This study used an experimental method in the laboratory. After determining the control Optimum Asphalt Content (OAC) of 5.5%, Marshall testing was carried out on AC-BC mixtures with variations in LDPE addition (5%, 6%, and 7%) and variations in asphalt content (5%, 5.5%, 6%, and 6.5%). The results showed that the addition of LDPE increased the Marshall stability value. The highest stability value reached 2402 kg at an LDPE addition rate of 7% with an asphalt content of 5%. In addition, the addition of LDPE also increased the Flow, Marshall Quotient (MQ), Voids in Mix (VIM), Voids Filled with Asphalt (VFA), and Voids in Mineral Aggregate (VMA) values. In conclusion, the utilization of LDPE plastic waste has a significant effect on the mechanical and volumetric characteristics of AC-BC mixtures.
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Tensile Strength of AC-BC (Asphalt Concrete – Binder Course) Asphalt Mixture Using Low-Density Polyethylene (LDPE) Plastic as an Additive: A Marshall and SEM Microstructural Study
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Researchers found that mixing recycled plastic bag waste (LDPE) into road asphalt, up to about 4% of the mix, actually makes roads stronger and more crack-resistant, offering a practical way to reuse plastic trash instead of letting it pile up in landfills or waterways. While this study focused on road durability rather than health effects directly, keeping plastic waste out of the environment matters for human health too, since plastic that breaks down outdoors can become microplastics that end up in our water, food, and eventually our bodies.
Plastic Waste as a Modifier for Flexible Pavement Performance
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Researchers reviewed field and laboratory studies on plastic-modified bituminous pavements and found that incorporating HDPE and LDPE waste improves binding strength, thermal stability, water resistance, and road service life compared to conventional asphalt, offering a route to simultaneously manage plastic waste and reduce road maintenance costs.
Tensile Strength of AC-BC (Asphalt Concrete – Binder Course) Asphalt Mixture Using Low-Density Polyethylene (LDPE) Plastic as an Additive: A Marshall and SEM Microstructural Study
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Researchers found that mixing recycled plastic bag waste (LDPE) into road pavement, up to about 4%, actually makes roads stronger and more crack-resistant, offering a promising way to reuse plastic trash instead of sending it to landfills or letting it pollute the environment. This matters for human health because reducing plastic waste in the environment means less of it breaking down into microplastics that can end up in our water, food, and air; however, this study focused on pavement durability, not on whether plastic-infused roads themselves shed microplastics over time, so that question still needs research.
An evaluation of waste plastic in asphalt pavement towards a circular economy
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This engineering study evaluated the use of waste plastic including LLDPE and PET as additives in asphalt pavement mixtures to improve performance. Researchers found that optimal amounts of waste plastic improved pavement durability while providing an outlet for plastic waste. The study explores plastic upcycling in road construction as a contribution to circular economy goals.
The Use of Recycled Plastic in Asphalt Pavements: Feasibility Study
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A feasibility study found that incorporating recycled waste plastics into asphalt via a dry-process method improved rutting and moisture-damage resistance when aggregates were pre-heated to higher temperatures. Diverting waste plastics into road construction represents a promising strategy to reduce the volume of plastic waste that would otherwise degrade into environmental microplastics.
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