Correlation of viscosimetry and practical tests of fresh cement paste consistency

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00348399" target="_blank" >RIV/68407700:21110/21:00348399 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1063/5.0042721" target="_blank" >https://doi.org/10.1063/5.0042721</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0042721" target="_blank" >10.1063/5.0042721</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Correlation of viscosimetry and practical tests of fresh cement paste consistency

Popis výsledku v původním jazyce

The paper presents numerical modeling of fresh cement pastes correlated with viscosimetry measurements. Laboratory mini slump-flow tests are performed with three pastes of different fluidity. The mixtures are varying in water to cement ratio and amount of admixtures used. Static and dynamic viscosity examination using a rotational rheometer is performed in order to obtain material parameters of the Herschel-Bulkley model. Three material models are derived from different cycles of rheometer flow curves and fitted for every paste. The numerical simulation is performed with the computational fluid dynamics (CFD) package in ANSYS Fluent. The 2D axisymmetrical Volume of Fluid (VOF) with two variants of the model is prepared. The first variant is considering an instantaneous demoulding, which leads to overestimation of the final slump spread. The second variant considered mold lifting as a part of the simulation. The final spread is decreased compared to the variant with instantaneous demoulding. However, no model yields a satisfying agreement with experimental data. More complex models able to capture thixotropic behavior would be more appropriate for the tested cases.

Název v anglickém jazyce

Correlation of viscosimetry and practical tests of fresh cement paste consistency

Popis výsledku anglicky

The paper presents numerical modeling of fresh cement pastes correlated with viscosimetry measurements. Laboratory mini slump-flow tests are performed with three pastes of different fluidity. The mixtures are varying in water to cement ratio and amount of admixtures used. Static and dynamic viscosity examination using a rotational rheometer is performed in order to obtain material parameters of the Herschel-Bulkley model. Three material models are derived from different cycles of rheometer flow curves and fitted for every paste. The numerical simulation is performed with the computational fluid dynamics (CFD) package in ANSYS Fluent. The 2D axisymmetrical Volume of Fluid (VOF) with two variants of the model is prepared. The first variant is considering an instantaneous demoulding, which leads to overestimation of the final slump spread. The second variant considered mold lifting as a part of the simulation. The final spread is decreased compared to the variant with instantaneous demoulding. However, no model yields a satisfying agreement with experimental data. More complex models able to capture thixotropic behavior would be more appropriate for the tested cases.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/FW01010521" target="_blank" >FW01010521: Mikrostrukturální modifikace samozhutnitelných betonů pro snížení tlaků na bednění</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference

ISBN

978-0-7354-4066-1

ISSN

0094-243X

e-ISSN

0094-243X

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

AIP Publishing

Místo vydání

Melville, NY

Místo konání akce

Skalský Dvůr

Datum konání akce

14. 10. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000653725400039