Comparative life cycle assessment to maximize CO₂ sequestration of steel slag products

Carbon capture utilization and storage is one of the most eminent technologies to mitigate climate change. Steel slag can be treated as a potential material owing to the large percentage of alkaline silicate minerals contained. Herein, a comparative evaluation of environmental impacts of producing artificial cold-bonded steel slag aggregates and pure steel slag blocks was carried out using life cycle assessment method. The global warming potential results show that steel slag block is possible to achieve a negative emission. Detailed results indicate the carbonation curing and production of carbon dioxide constitute a large proportion of emissions. The production of carbon dioxide account for 12% and 50% of total CO₂-eq emissions for artificial steel slag aggregate and steel slag block respectively, thus, cut-off rule cannot be applied. The sensitivity analysis of transport shows that global warming potential will become positive under long transport distance. Meanwhile, the diesel consumption for transportation also has a significant impact on the acidification potential and eutrophication potential. This study also investigated the working efficiency of different grinding machine and horizontal roller mill was determined to be the most efficient and energy saving technique, considering its output particle size of steel slag powder and equipment wear during operation.

• Record URL:
  https://doi.org/10.1016/j.conbuildmat.2021.123876
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0950061821016366
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2021 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Li, Lufan
  • Jiang, Yi
  • Pan, Shu-Yuan
  • Ling, Tung-Chai
• Publication Date: 2021-9-6

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Illustrations; References; Tables;
• Pagination: 123876
• Serial:
  • Construction and Building Materials
  • Volume: 298
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Blocks; Carbon dioxide; Life cycle analysis; Sensitivity analysis; Slag; Slag coarse aggregates
• Subject Areas: Environment; Materials; Pavements;

Filing Info

• Accession Number: 01776896
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 23 2021 3:23PM