articleNatureMay 22, 2024HYBRID OA

Electric recycling of Portland cement at scale

CFCyrille F. DunantSJShiju JosephRPRohit PrajapatiJMJulian M. Allwood

University of Cambridge

PubMed
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Abstract

Abstract Cement production causes 7.5% of global anthropogenic CO 2 emissions, arising from limestone decarbonation and fossil-fuel combustion 1–3 . Current decarbonation strategies include substituting Portland clinker with supplementary materials, but these mainly arise in emitting processes, developing alternative binders but none yet promises scale, or adopting carbon capture and storage that still releases some emissions 4–8 . However, used cement is potentially an abundant, decarbonated feedstock. Here we show that recovered cement paste can be reclinkered if used as a partial substitute for the lime–dolomite flux used in steel recycling nowadays. The resulting slag can meet existing specifications for…

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Authors

4

Topics & keywords

Topics
Keywords
  • Scrap
  • Portland cement
  • Slag (welding)
  • Cement
  • Waste management
  • Clinker (cement)
  • Lime
  • Environmental science
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