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Alkali activation of a high MgO GGBS: fresh and hardened properties
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Babylon Univ, Civil Engn Dept, Babylon, Iraq.
Univ Sheffield, Dept Mat Sci & Engn, Sheffield, S Yorkshire, England.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
2018 (English)In: Magazine of Concrete Research, ISSN 0024-9831, E-ISSN 1751-763X, Vol. 70, no 24, p. 1256-1264Article in journal (Refereed) Published
Abstract [en]

In this study, concretes and pastes were produced from a high magnesium oxide (MgO) ground granulated blast furnace slag (magnesium oxide content 16.1 wt%) by alkali activation with various amounts and combinations of sodium carbonate and sodium silicate. Sodium carbonate activators tended to reduce slump compared to sodium silicate at the same dose, and, in contrast to the literature for many blast furnace slags with more moderate magnesium oxide, to shorten the initial and final setting times in comparison with concretes activated by sodium silicate for dosages less than 10 wt%. Higher heat curing temperatures and the use of larger dosages of alkali activators resulted in higher early-age compressive cube strength values. The X-ray diffraction analysis of 7 and 28 d old pastes activated with sodium carbonates revealed formation of gaylussite, calcite, nahcolite and calcium-aluminium-silicate-hydrate (C-A-S-H) gel. Curing at 20 degrees C appeared to promote dissolution of gaylussite and calcite, while heat curing promoted their replacement with C-A-S-H, which also resulted in higher ultimate cube compressive strength values. Conversely, mixes activated with sodium silicate contained less crystalline phases and more disordered gel, which strengthened the binder matrix.

Place, publisher, year, edition, pages
Westminster England: ICE Publishing , 2018. Vol. 70, no 24, p. 1256-1264
Keywords [en]
compressive strength, curing, setting properties
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-71837DOI: 10.1680/jmacr.17.00436ISI: 000450222300002Scopus ID: 2-s2.0-85049372488OAI: oai:DiVA.org:ltu-71837DiVA, id: diva2:1267135
Note

Validerad;2018;Nivå 2;2018-11-30 (inah)

Available from: 2018-11-30 Created: 2018-11-30 Last updated: 2019-09-13Bibliographically approved

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Cwirzen, Andrzej

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