Characterisation of the hydration products of a chemically and mechanically activated high coal fly ash hybrid cement

dc.contributor.authorDu Toit, Grizelda
dc.contributor.authorVan der Merwe, Elizabet Margaretha
dc.contributor.authorKruger, Richard A.
dc.contributor.authorMcDonald, James M.
dc.contributor.authorKearsley, Elsabe P.
dc.contributor.emailelsabe.kearsley@up.ac.zaen_US
dc.date.accessioned2023-09-21T05:12:42Z
dc.date.available2023-09-21T05:12:42Z
dc.date.issued2022-01-27
dc.description.abstractCement companies are significant contributors of the planet’s anthropogenic CO2 emissions. With increased awareness of the substantial volume of CO2 emissions from cement production, a variety of mitigation strategies are being considered and pursued globally. Hybrid cements are deemed to be technologically viable materials for contemporary construction. They require less clinker than that for ordinary Portland cement, leading to a decrease in CO2 emissions per tonne of hybrid cement manufactured. The hybrids produced in this study consist of 70% siliceous coal fly ash and 30% Portland cement, and combines chemical (sodium sulphate) and mechanical (milling) activation. The aim of this work was to develop a better understanding of the hydration products formed and the resulting effect of activation on these hydration products, of hybrid coal fly ash cement pastes over an extended curing period of up to one year. The results indicated that chemical activation increases the formation of stable, well crystallised ettringite. Chemical activation as well as mechanical activation increased the rate of the pozzolanic reaction between portlandite contained in cement and coal fly ash. The application of combined chemical and mechanical activation definitely resulted in the fastest rate of portlandite consumption, hence an increased rate of the pozzolanic reaction.en_US
dc.description.departmentChemistryen_US
dc.description.departmentCivil Engineeringen_US
dc.description.librarianam2023en_US
dc.description.sponsorshipThe National Research Foundation of South Africa.en_US
dc.description.urihttps://www.mdpi.com/journal/mineralsen_US
dc.identifier.citationDu Toit, G.; Van der Merwe, E.M.; Kruger, R.A.; McDonald, J.M.; Kearsley, E.P. Characterisation of the Hydration Products of a Chemically and Mechanically Activated High Coal Fly Ash Hybrid Cement. Minerals 2022, 12, 157. https://DOI.org/10.3390/min12020157.en_US
dc.identifier.issn2075-163X (online)
dc.identifier.other10.3390/min12020157
dc.identifier.urihttp://hdl.handle.net/2263/92352
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.en_US
dc.subjectHybrid cementen_US
dc.subjectCoal fly ashen_US
dc.subjectEttringiteen_US
dc.subjectPozzolanic reactivityen_US
dc.subjectCompressive strengthen_US
dc.titleCharacterisation of the hydration products of a chemically and mechanically activated high coal fly ash hybrid cementen_US
dc.typeArticleen_US

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
DuToit_Characterisation_2022.pdf
Size:
10.18 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: