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The effect of carbon dioxide on β-dicalcium silicate and Portland cement

The effect of carbon dioxide on β-dicalcium silicate and Portland cement

Shtepenko, Olga, Hills, Colin, Brough, Adrian and Thomas, Mike (2006) The effect of carbon dioxide on β-dicalcium silicate and Portland cement. Chemical Engineering Journal, 118 (1-2). pp. 107-118. ISSN 1385-8947 (doi:https://doi.org/10.1016/j.cej.2006.02.005)

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Abstract

Carbonation of silicate-based minerals and industrial residues can help to reduce CO2 emissions as well as produce useful materials. However, until a full understanding of the chemistry and microstructural development of carbonation products is obtained, their utilization in engineering applications may remain limited. In respect of this, the present work examines microstructural properties of accelerated carbonated dicalcium silicate and Portland cement by using the complementary analytical techniques of XRD, SEM, TG-DTA, and NMR MAS. It was found that carbon dioxide reacts with calcium silicates to form calcite and aragonite and a polymerized silicate product comprised of cross-linked Q3 co-ordinated silicon and fully polymerized Q4 co-ordinated silicon. The extent of silicate polymerization was higher in carbonated dicalcium silicate, however, in the Portland cement-derived product, Al substitution in the Si-framework was detected. The amount of CO2 that reacted with dicalcium silicate and Portland cement was 48 and 37% by mass, respectively.

Item Type: Article
Uncontrolled Keywords: Carbon dioxide sequestration, Accelerated carbonation, Anhydrous silicate minerals, Characterization
Pre-2014 Departments: School of Science > Centre for Contaminated Land Remediation Research Group
Last Modified: 19 Oct 2016 13:25
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/13559

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