Effect of activator dosage, water-to-binder-solids ratio, temperature and duration of elevated temperature curing on the compressive strength of alkali-activated fly ash cement pastes

dc.contributor.authorShekhovtsova, Julia
dc.contributor.authorKearsley, Elsabe P.
dc.contributor.authorKovtun, Maxim
dc.contributor.emailelsabe.kearsley@up.ac.zaen_ZA
dc.date.accessioned2015-02-10T10:45:57Z
dc.date.available2015-02-10T10:45:57Z
dc.date.issued2014-10
dc.description.abstractIn this paper the effect of sodium oxide concentration, the water-to-binder-solids ratio, temperature, and the duration of elevated temperature curing on the compressive strength of alkali-activated fly ash cement pastes was investigated. Alkali concentration varied between 3% and 15% Na2O of fly ash mass. An increase in Na2O from 3% to 9% greatly improved the compressive strength of the pastes from 26.1 MPa to 50.8 MPa at 28 days. A further increase in Na2O up to 15% did not provide an increase in the strength, but a decrease was observed, as well as higher strength variation. The paste activated with 9% Na2O had the highest strength at 28 days and a low standard deviation, and 9% Na2O was thus considered as the best value in the present study. The temperature and the duration of elevated temperature curing were found to be critical factors affecting the compressive strength at early age, but their effect decreased significantly in the long term. The water-to-binder-solids ratio affected the compressive strength considerably. An increase in the water-to-binder-solids ratio of the pastes from 0.18 to 0.29 resulted in a decrease in the compressive strength from 49.3 MPa to 21.3 MPa.en_ZA
dc.description.librarianhb2015en_ZA
dc.description.urihttp://www.journals.co.za/ej/ejour_civileng.htmlen_ZA
dc.identifier.citationShekhovtsova, J, Kearsley, EP & Kovtun, M 2014, 'Effect of activator dosage,water-to-binder-solids ratio,temperature and duration of elevated temperature curing on the compressive strength of alkali-activated fly ash cement pastes', Journal of the South African Institution of Civil Engineering, vol. 56, no. 3, pp. 44-52.en_ZA
dc.identifier.issn1021-2019 (print)
dc.identifier.urihttp://hdl.handle.net/2263/43613
dc.language.isoenen_ZA
dc.publisherSouth African Institution of Civil Engineeringen_ZA
dc.rightsSouth African Institution of Civil Engineeringen_ZA
dc.subjectFly ashen_ZA
dc.subjectSodium hydroxideen_ZA
dc.subjectAlkali-activated cementen_ZA
dc.subjectTemperatureen_ZA
dc.subjectCompressive strengthen_ZA
dc.subjectSodium oxide concentrationen_ZA
dc.subjectWater-to-binder-solids ratioen_ZA
dc.titleEffect of activator dosage, water-to-binder-solids ratio, temperature and duration of elevated temperature curing on the compressive strength of alkali-activated fly ash cement pastesen_ZA
dc.typeArticleen_ZA

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Shekhovtsova_Effect_2014.pdf
Size:
1.26 MB
Format:
Adobe Portable Document Format
Description:
Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: