Affiliation:
1. Energy and Materials in Infrastructure and Buildings (EMIB), Faculty of Applied Engineering, University of Antwerp, Antwerp, Belgium
Abstract
Increased environmental awareness has led road agencies to consider the implementation of green public procurement (GPP). Besides sustainability rating systems, environmental indicators can also be implemented in GPP to help road agencies make informed decisions about the environmental impact of the pavement works they procure. A vast literature review revealed that it is still unclear which impact categories are responsible for the majority of the total environmental impact of asphalt mixtures. The objective of this study was to identify the impact categories with the greatest contribution to the total environmental impact of hot mix asphalt so that they can be implemented in the form of environmental indicators in GPP. The scope included conventional and polymer-modified binder and three mix design alternatives: only virgin aggregate, reclaimed asphalt pavement (RAP), and RAP with rejuvenators. The cradle-to-cradle life cycle assessment (LCA) performed showed that global warming (GW), fine particulate matter formation, fossil resource scarcity, and human non-carcinogenic toxicity were responsible for at least 90% of the total impact according to the ReCiPe 2016 hierarchic assessment method. Therefore, a simplified LCA focusing on these four impact categories seems sufficient for the purpose of comparing the environmental performance of alternatives in GPP. It was also found that GW alone accounted for approximately 50% of the total impact, which seems to make GW a good surrogate for the total impact among the asphalt mixtures evaluated. Future work should investigate whether the conclusions from this study still hold up when using secondary materials, lower temperature mixing technologies, or in-situ recycling.
Funder
Port of Antwerp
Fonds Wetenschappelijk Onderzoek
Agentschap Innoveren en Ondernemen
Subject
Mechanical Engineering,Civil and Structural Engineering
Reference45 articles.
1. Williams B. A., Willis J. R., Shacat J. Annual Asphalt Pavement Industry Survey on Recycled Materials and Warm-Mix Asphalt Usage: 2019. National Asphalt Pavement Association, Greenbelt, MD, 2020, p. 48. https://doi.org/10.13140/RG.2.2.21946.82888.
2. European Commission. Buying Green! A Handbook on Green Public Procurement, 3rd ed. Publications Office of the European Union, Luxembourg, Europe, 2016. https://doi.org/10.2779/246106.
3. Harvey J. T., Meijer J., Ozer H., Al-Qadi I. L., Saboori A., Kendall A. Pavement Life-Cycle Assessment Framework, 2016. https://www.fhwa.dot.gov/pavement/sustainability/hif16014.pdf.
4. Praticò F. G., Giunta M., Mistretta M., Gulotta T. M. Energy and Environmental Life Cycle Assessment of Sustainable Pavement Materials and Technologies for Urban Roads. Sustainability, Vol. 12, 2020, p. 704. https://doi.org/10.3390/su12020704.
5. Ma H., Zhang Z., Zhao X., Wu S. A Comparative Life Cycle Assessment (LCA) of Warm Mix Asphalt (WMA) and Hot Mix Asphalt (HMA) Pavement: A Case Study in China. Advances in Civil Engineering, Vol. 2019, 2019, pp. 1–12. https://doi.org/10.1155/2019/9391857.
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