<div class="csl-bib-body">
<div class="csl-entry">Kabashi, V., Liberto, T., & Robisson, A. (2022, March 3). <i>Shear induced particle migration in cement mortars</i> [Conference Presentation]. 31st Conference with Workshop on Rheology of building materials 2022, Regensburg, Germany. http://hdl.handle.net/20.500.12708/193720</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/193720
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dc.description.abstract
We show in this study that pumping mortars over long distances can lead to microstructural heterogeneities. This work follows numerous studies on particle migration of Newtonian-fluid-based suspensions under flow, where particles migrate from areas of higher shear rates (in a pipe, near the wall) to areas of lower shear rates (center of the pipe). Our fluid is here a mortar, made of a white cement slurry filled with 30 vol% red glass beads of approximate average size 500 um. After estimating that the distance needed to reach steady-state in mortars would be on the orders of hundred meters (Nott & Brady, 1994), we built a setup where the flow imposed on the suspension is a large-amplitude oscillatory flow (Butler et al. 1999, Snook et al. 2015, Schleibinger Slipper).
We performed experiments with three different mixtures, where the suspension yield stress and cover distance vary. As we could not measure particle concentration in-situ during flow, we let the mortar set and measured solid volume fractions in various cuts and polished sections of the pipe. Each image was treated with ImageJ to measure the local particle concentration as a function of the radial position. Quantification of the wall steric hindrance, as well as the stability (lack of settling of particles) of all three mixtures were controlled in reference samples (tube of same diameter of pumping pipe, but where no pumping was imposed). In almost all cases, particle migration is clearly evidenced, with a dependence on the cement yield stress.
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dc.language.iso
en
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dc.subject
particle migration
en
dc.subject
mortar pumping
en
dc.title
Shear induced particle migration in cement mortars
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Conference Presentation
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tuw.researchTopic.id
M2
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E207-01 - Forschungsbereich Baustofflehre und Werkstofftechnologie
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tuw.author.orcid
0000-0002-4985-9110
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tuw.author.orcid
0000-0002-2434-6175
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tuw.event.name
31st Conference with Workshop on Rheology of building materials 2022
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tuw.event.startdate
03-03-2022
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tuw.event.enddate
04-03-2022
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Regensburg
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tuw.event.country
DE
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tuw.event.presenter
Robisson, Agathe
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wb.sciencebranch
Bauingenieurwesen
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wb.sciencebranch
Werkstofftechnik
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wb.sciencebranch.oefos
2011
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wb.sciencebranch.oefos
2050
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wb.sciencebranch.value
50
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wb.sciencebranch.value
50
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item.grantfulltext
none
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item.openairecristype
http://purl.org/coar/resource_type/c_18cp
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item.openairetype
conference paper not in proceedings
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item.cerifentitytype
Publications
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item.fulltext
no Fulltext
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item.languageiso639-1
en
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crisitem.author.dept
E207 - Institut für Werkstofftechnologie, Bauphysik und Bauökologie
