Bernal, S.A., San Nicolas, R., Van Deventer, J.S.J. et al. (1 more author) (2016) Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator. Advances in Cement Research, 28 (4). pp. 262-273. ISSN 0951-7197
Abstract
An alkali-activated slag cement produced with a blend of sodium carbonate/sodium silicate activator was characterised. This binder hardened within 12 h and achieved a compressive strength of 20 MPa after 24 h of curing under ambient conditions, which is associated with the formation of an aluminium substituted calcium silicate hydrate as the main reaction product. Carbonates including pirssonite, vaterite, aragonite and calcite were identified along with the zeolites hydroxysodalite and analcime at early times of reaction. The partial substitution of sodium carbonate by sodium silicate reduces the concentration of carbonate ions in the pore solution, increasing the alkalinity of the system compared with a solely carbonate-activated paste, accelerating the kinetics of reaction and supplying additional silicate species to react with the calcium dissolving from the slag as the reaction proceeds. These results demonstrate that this blend of activators can be used effectively for the production of high-strength alkali-activated slag cements, with a microstructure comparable to what has been identified in aged sodium-carbonate-activated slag cements but without the extended setting time reaction usually identified when using this salt as an alkali activator.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 Thomas Telford. This is an author produced version of a paper subsequently published in Advances in Cement Research . Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number EUROPEAN RESEARCH COUNCIL GeopolyConc - 335928 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Apr 2016 15:07 |
Last Modified: | 23 Dec 2016 01:38 |
Published Version: | https://dx.doi.org/10.1680/jadcr.15.00013 |
Status: | Published |
Publisher: | Thomas Telford |
Refereed: | Yes |
Identification Number: | 10.1680/jadcr.15.00013 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97619 |