Abstract
The desire to develop sustainable infrastructure, including pavement structures and materials, is ever increasing in recent times. One opportunity is to partially replace high-cost bituminous binder with low-cost recycled plastic in asphalt mixtures. This synthesis combines the various research efforts to understand the effects of two commercially available recycled plastics, known as MR6 and MR10, on bituminous binders and asphalt mixtures. Using common test methods from the United Kingdom, the United States and Australia, generally consistent and significant effects were observed in various base bitumen grades and various common asphalt mixture types. Binder resistance to flow and binder elasticity both increased significantly and were associated with the three to four grade increases under the Performing Grading system. Similarly, mixture stiffness and mixture resistance to deformation increased significantly, while crack resistance and moisture damage resistance were not significantly affected. The effects of MR6 and MR10 were generally similar to the effects associated with conventional polymer modification of asphalt binders and asphalt mixtures, particularly those effects associated with plastomeric polymers.
Highlights
The desire to develop sustainable infrastructure, including pavement structures and materials, is ever increasing in recent times [1]
This paper presents a synthesis of research on two commercially available recycled plastic products for the modification and extension of bituminous binders in asphalt mixture production
All these results indicate the addition of recycled plastic to otherwise unmodified bitumen increases the resistance to flow of the bituminous binder
Summary
The desire to develop sustainable infrastructure, including pavement structures and materials, is ever increasing in recent times [1]. It is important to understand that sustainability initiatives are only viable if the cost to collect, process, and reincorporate a recycled material or product is less expensive than the cost of the material or product that it replaces [4]. For this reason, the replacement of high-cost materials, such as bituminous binder, and cement, with recycled or repurposed materials is a great interest. The products, known as MR6 and MR10, are intended to be plastomeric and elastomeric, respectively This synthesis is focused on the physical and mechanical properties of the bituminous binder and asphalt mixtures produced with both recycled plastic products. Environmental and practical issues, such as leaching, fuming, and storage stability, are not addressed here
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