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The Effect of Blast Furnace Slag/Fly Ash Ratio on Setting, Strength, and Shrinkage of Alkali-Activated Pastes and Concretes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Civil Engineering Department, Babylon University, Hillah, Iraq.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Department of Materials Science and Engineering, University of Sheffield, Sheffield, United Kingdom.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
2019 (English)In: Frontiers in Materials, ISSN 2296-8016, Vol. 6, no 9Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to determine the effects of partial fly ash substitution in to a series of alkali-activated concrete based on a high-MgO blast furnace slag BFS. Mixes were activated with various amounts of sodium silicate at alkali modulus (mass ratio SiO2/Na2O) values of 1.0, 0.5, and 0.25. The results showed that, an increase in the fly ash content extended the initial setting time but had very little effect on the final setting time, although the early age compressive strength was decreased. The fly ash addition had no effect on the drying shrinkage but lowered the autogenous shrinkage. The mixes activated with sodium silicate at a lower alkali modulus showed a significantly higher autogenous shrinkage but lower drying shrinkage values. Severe micro cracking of the binder matrix was observed only for mixes without fly ash, activated with sodium silicate solution at higher alkali modulus. Decreasing the alkali modulus resulted in a higher autogenous shrinkage, less micro cracking and a more homogenous structure due to more extensive formation of sodium-aluminate-silicate-hydrate gel (N-A-S-H), promoted by the addition, and more extensive reaction of the fly ash.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019. Vol. 6, no 9
Keywords [en]
fly ash FA, blast furnace slag BFS, initial and final setting time, shrinkage, alkali-activated binders
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-73145DOI: 10.3389/fmats.2019.00009ISI: 000458669200001Scopus ID: 2-s2.0-85062450166OAI: oai:DiVA.org:ltu-73145DiVA, id: diva2:1294856
Note

Validerad;2019;Nivå 2;2019-03-08 (johcin)

Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-03-15Bibliographically approved

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Humad, AbeerKothari, AnkitCwirzen, Andrzej

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