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Substantial global carbon uptake by cement carbonation
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2016 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 9, no 12, 880-883 p.Article in journal (Refereed) Published
Abstract [en]

Calcination of carbonate rocks during the manufacture of cement produced 5% of global CO 2 emissions from all industrial process and fossil-fuel combustion in 2013. Considerable attention has been paid to quantifying these industrial process emissions from cement production, but the natural reversal of the process - carbonation - has received little attention in carbon cycle studies. Here, we use new and existing data on cement materials during cement service life, demolition, and secondary use of concrete waste to estimate regional and global CO 2 uptake between 1930 and 2013 using an analytical model describing carbonation chemistry. We find that carbonation of cement materials over their life cycle represents a large and growing net sink of CO 2, increasing from 0.10 GtC yr â '1 in 1998 to 0.25 GtC yr â '1 in 2013. In total, we estimate that a cumulative amount of 4.5 GtC has been sequestered in carbonating cement materials from 1930 to 2013, offsetting 43% of the CO 2 emissions from production of cement over the same period, not including emissions associated with fossil use during cement production. We conclude that carbonation of cement products represents a substantial carbon sink that is not currently considered in emissions inventories.

Place, publisher, year, edition, pages
2016. Vol. 9, no 12, 880-883 p.
National Category
Other Environmental Engineering Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27583DOI: 10.1038/ngeo2840Scopus ID: 2-s2.0-85001105680OAI: oai:DiVA.org:ri-27583DiVA: diva2:1058281
Available from: 2016-12-20 Created: 2016-12-19 Last updated: 2017-01-09Bibliographically approved

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