Homogenization of transport processes and hydration phenomena in fresh concrete

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00340243" target="_blank" >RIV/68407700:21110/20:00340243 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.14311/AP.2020.60.0012" target="_blank" >https://doi.org/10.14311/AP.2020.60.0012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/AP.2020.60.0012" target="_blank" >10.14311/AP.2020.60.0012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Homogenization of transport processes and hydration phenomena in fresh concrete

Popis výsledku v původním jazyce

The problem of hydration and transport processes in fresh concrete is strongly coupled and non-linear, and therefore, very difficult for a numerical modelling. Physically accurate results can be obtained using fine-scale simulations, which are, however, extremely time consuming. Therefore, there is an interest in developing new physically accurate and computationally effective models. In the paper, a new fully coupled two-scale (meso-macro) homogenization framework for modelling of simultaneous heat transfer, moisture flows, and hydration phenomena in fresh concrete is proposed. A modified mesoscale model is first introduced. In this model, concrete is assumed as a composite material with two periodically distributed mesoscale components, cement paste and aggregates. A homogenized model is then derived by an upscaling method from the mesoscale model. The coefficients for the homogenized model are obtained from the solution of a periodic cell problem. For solving the periodic cell problem, two approaches are used - a standard finite element method and a simplified closed-form approximation taken from literature. The homogenization framework is then implemented in MATLAB environment and finally employed for illustrative numerical experiments, which verify that the homogenized model provides physically accurate results comparable with the results obtained by the mesoscale model. Moreover, it is verified that using the homogenization framework with a closed-form approach to the periodic cell problem, significant computational cost savings can be achieved.

Název v anglickém jazyce

Homogenization of transport processes and hydration phenomena in fresh concrete

Popis výsledku anglicky

The problem of hydration and transport processes in fresh concrete is strongly coupled and non-linear, and therefore, very difficult for a numerical modelling. Physically accurate results can be obtained using fine-scale simulations, which are, however, extremely time consuming. Therefore, there is an interest in developing new physically accurate and computationally effective models. In the paper, a new fully coupled two-scale (meso-macro) homogenization framework for modelling of simultaneous heat transfer, moisture flows, and hydration phenomena in fresh concrete is proposed. A modified mesoscale model is first introduced. In this model, concrete is assumed as a composite material with two periodically distributed mesoscale components, cement paste and aggregates. A homogenized model is then derived by an upscaling method from the mesoscale model. The coefficients for the homogenized model are obtained from the solution of a periodic cell problem. For solving the periodic cell problem, two approaches are used - a standard finite element method and a simplified closed-form approximation taken from literature. The homogenization framework is then implemented in MATLAB environment and finally employed for illustrative numerical experiments, which verify that the homogenized model provides physically accurate results comparable with the results obtained by the mesoscale model. Moreover, it is verified that using the homogenization framework with a closed-form approach to the periodic cell problem, significant computational cost savings can be achieved.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Acta Polytechnica

ISSN

1210-2709

e-ISSN

1805-2363

Svazek periodika

60

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

13

Strana od-do

12-24

Kód UT WoS článku

000518459900002

EID výsledku v databázi Scopus

2-s2.0-85081246013