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Mixed-unit hybrid life cycle assessment applied to the recycling of construction materials

Author

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  • Soo Huey Teh

    (University of New South Wales)

  • Thomas Wiedmann

    (University of New South Wales
    The University of Sydney)

  • Stephen Moore

    (University of New South Wales)

Abstract

The construction industry contributes around 18% of greenhouse gas emissions, 40% of depletion of natural resources, and 25% of wastes globally. To reduce these impacts, construction industries can adopt low-carbon alternatives for construction materials and waste minimisation strategies, including the recycling of construction and demolition waste. However, a comprehensive understanding of the full life cycle carbon profile of low-carbon and recyclable construction materials is required to accurately assess the efficacy of decarbonisation strategies in the built environment. Despite recent progress in hybrid life cycle assessment (hybrid LCA) methods, some weaknesses remain with respect to the inherent uncertainty relating to price variations and aggregated sectors that are unable to provide detailed waste-specific information in hybrid LCA. Furthermore, attributional, hybrid LCA for a functional unit does not reflect the actual, economy-wide physical flows of materials in a real economy. In this study, a mixed-unit hybrid LCA approach based on a combination of process life cycle inventory, input–output, and material flow data is used to model the economy-wide potential use of recycled construction materials in Australia. A comparison between methods of life cycle emissions of geopolymer concrete revealed that the mixed-unit hybrid LCA approach produced a more accurate and Australian-specific result. The usefulness of the proposed mixed-unit IO model is demonstrated through quantifying the cradle-to-gate embodied emissions of recycled construction materials and by-products utilised in concrete and steel sectors in Australia. The results yield a 1% reduction when recycled concrete aggregate completely replaces natural aggregate in both ordinary Portland cement and geopolymer concrete. Greenhouse gas emissions reduction of 30% is quantified for geopolymer concrete using recycled concrete aggregate compared with ordinary Portland cement concrete utilising natural aggregate and 43% is estimated for electric arc furnace route using iron and steel scrap compared with basic oxygen furnace route. The method merges physical and monetary units of industrial systems related to low-carbon alternatives and recycled construction materials to enable the calculations of embodied carbon with improved accuracy. The results of this study can help inform decarbonisation strategies in the built environment sector.

Suggested Citation

  • Soo Huey Teh & Thomas Wiedmann & Stephen Moore, 2018. "Mixed-unit hybrid life cycle assessment applied to the recycling of construction materials," Journal of Economic Structures, Springer;Pan-Pacific Association of Input-Output Studies (PAPAIOS), vol. 7(1), pages 1-25, December.
    • Handle: RePEc:spr:jecstr:v:7:y:2018:i:1:d:10.1186_s40008-018-0112-4
    DOI: 10.1186/s40008-018-0112-4
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    4. Mohamed Rabie & Mohammad R. Irshidat & Nasser Al-Nuaimi, 2022. "Ambient and Heat-Cured Geopolymer Composites: Mix Design Optimization and Life Cycle Assessment," Sustainability, MDPI, vol. 14(9), pages 1-17, April.
    5. Héctor Hernández & Felipe Ossio & Michael Silva, 2023. "Assessment of Sustainability and Efficiency Metrics in Modern Methods of Construction: A Case Study Using a Life Cycle Assessment Approach," Sustainability, MDPI, vol. 15(7), pages 1-25, April.
    6. Edgar Battand Towa Kouokam & Vanessa Zeller & Wouter Achten, 2019. "Input-output models and waste management analysis: A critical review," ULB Institutional Repository 2013/359535, ULB -- Universite Libre de Bruxelles.
    7. Shahjadi Hisan Farjana & Tatenda Miriam Mungombe & Hasith Madhumahda Kahanda Gamage & Anmol Sarfraj Rajwani & Olubukola Tokede & Mahmud Ashraf, 2023. "Circulating the E-Waste Recovery from the Construction and Demolition Industries: A Review," Sustainability, MDPI, vol. 15(16), pages 1-20, August.
    8. Guanru Wang & Dariusz Krzywda & Sergey Kondrashev & Lubov Vorona-Slivinskaya, 2021. "Recycling and Upcycling in the Practice of Waste Management of Construction Giants," Sustainability, MDPI, vol. 13(2), pages 1-14, January.
    9. Muhandiramge Nimashi Navodana Rodrigo & Srinath Perera & Sepani Senaratne & Xiaohua Jin, 2021. "Review of Supply Chain Based Embodied Carbon Estimating Method: A Case Study Based Analysis," Sustainability, MDPI, vol. 13(16), pages 1-20, August.
    10. Maxime Agez & Richard Wood & Manuele Margni & Anders H. Strømman & Réjean Samson & Guillaume Majeau‐Bettez, 2020. "Hybridization of complete PLCA and MRIO databases for a comprehensive product system coverage," Journal of Industrial Ecology, Yale University, vol. 24(4), pages 774-790, August.

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