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dc.contributor.author
Zhang, Mai
dc.contributor.author
Zunino, Franco
dc.contributor.author
Lu, Yang
dc.contributor.author
Wang, Fazhou
dc.contributor.author
Scrivener, Karen
dc.date.accessioned
2023-11-16T07:38:41Z
dc.date.available
2023-11-16T04:45:40Z
dc.date.available
2023-11-16T07:38:41Z
dc.date.issued
2023-12
dc.identifier.issn
0008-8846
dc.identifier.other
10.1016/j.cemconres.2023.107348
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/642262
dc.identifier.doi
10.3929/ethz-b-000642262
dc.description.abstract
It has long been known that alkalis favor an increase in the early strength of cementitious materials but have a negative impact on long-term strengths. The reasons for the negative effect on later strengths are not clear. In this paper we investigated the influence of alkali addition on the properties of a white cement and for the first time propose a plausible mechanism for the late strength reduction. Quantitative XRD analysis and strength results showed that the addition of alkali generally limits the total degree of hydration (DoH) after 1 day. The evolution of internal relative humidity (RH) and saturated pore radius indicate that the more alkali added, the faster the decrease of internal RH and desaturation of the larger pores. The remaining solution in higher alkali system is concentrated in the smaller pores, where the needed supersaturation is higher. As a consequence, the hydration rate of cement is depressed by added alkali.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Alkalis
en_US
dc.subject
Compressive strength
en_US
dc.subject
Humidity
en_US
dc.subject
Hydration
en_US
dc.title
Understanding the negative effects of alkalis on long-term strength of Portland cement
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2023-10-14
ethz.journal.title
Cement and Concrete Research
ethz.journal.volume
174
en_US
ethz.journal.abbreviated
Cement Concrete Res
ethz.pages.start
107348
en_US
ethz.size
9 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02606 - Institut für Baustoffe (IfB) / Institute for Building Materials::03891 - Flatt, Robert J. / Flatt, Robert J.
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02606 - Institut für Baustoffe (IfB) / Institute for Building Materials::03891 - Flatt, Robert J. / Flatt, Robert J.
ethz.date.deposited
2023-11-16T04:45:45Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-11-16T07:38:42Z
ethz.rosetta.lastUpdated
2024-02-03T06:37:43Z
ethz.rosetta.versionExported
true
ethz.COinS
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