Recycled Plastics in Infrastructure: Current Practices, Understanding, and Opportunities (2023) / Chapter Skim
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9 Plastics production and use in the United States and globally has increased steadily since the development and introduction of the first synthetic polymers more than a century ago (NASEM 2022)
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10 RECYCLED PLASTICS IN INFRASTRUCTURE and they have different chemical compositions and physical properties. Recycling requires plastics to be sorted based on certain properties such as melting point, density, thickness, and color.
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INTRODUCTION 11 In passing the Transportation, Housing and Urban Development, and Related Agencies (THUD) Appropriations Act of 2021 (enacted on December 21, 2020)
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12 RECYCLED PLASTICS IN INFRASTRUCTURE BOX 1-1 Statement of Task In response to requests from Congress, this study will identify domestic and international examples of transportation and nontransportation infrastructure projects that have used recycled plastic materials. Based on an examination of these projects and a review of other relevant research and sources of information, the study committee will review and assess • the effectiveness and utility of the uses of plastics waste in infrastructure, including when it is incorporated into the asphalt mixes of pavements and other materials used in transportation and nontransportation infrastructure; • the extent to which plastics waste materials are consistent with recognized specifications and standards for asphalt and other infrastructure of different types and that are subject to different service levels and performance demands (e.g., strength, maintainability, service life, ride quality)
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INTRODUCTION 13 ˚ understanding of potential health, safety, and environmental im-pacts from these applications; and ˚ understanding of the ability of these applications to make infra-structure more resilient.
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14 RECYCLED PLASTICS IN INFRASTRUCTURE studies or examples that do not apply to major infrastructure (e.g., applications that are mainly for residential construction)
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INTRODUCTION 15 definitions and properties of thermoplastics and thermoset plastics are discussed in Chapter 2. While some thermoplastics such as expanded polystyrene are recyclable but not commonly recycled because of expense in doing so, reengineering of such plastic products could be done to make some of them more easily and economically recyclable.
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16 RECYCLED PLASTICS IN INFRASTRUCTURE streams offers opportunities but also poses challenges for the end user of the recycled plastics, especially for post-consumer plastics. These issues are discussed in more detail in Chapter 3.
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INTRODUCTION 17 plastics in infrastructure. These are presented in Appendixes G and H and include some detailed case studies.
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18 RECYCLED PLASTICS IN INFRASTRUCTURE infrastructure, centered on those high-volume applications that could advance use of meaningful amounts of plastics waste. • Chapter 8 provides an overview of ongoing research and development on new plastics and processes that will facilitate recycling of plastics waste in infrastructure and other applications.
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