MODELING ALKALI-SILICA-REACTION IN REINFORCED CONCRETE STRUCTURES COMBINING KINETICS AND FRACTURE MECHANICS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28399269%3A_____%2F18%3AN0000009" target="_blank" >RIV/28399269:_____/18:N0000009 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.eccm-ecfd2018.org/admin/files/filePaper/p390.pdf" target="_blank" >http://www.eccm-ecfd2018.org/admin/files/filePaper/p390.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

MODELING ALKALI-SILICA-REACTION IN REINFORCED CONCRETE STRUCTURES COMBINING KINETICS AND FRACTURE MECHANICS

Popis výsledku v původním jazyce

Alkali-silica reaction (ASR) is a reaction in concrete between alkali hydroxides and reactive siliceous aggregates. The paper presents a chemo-mechanical weakly coupled model for ASR. The chemical model predicts kinetics and volume expansion of macroscopicallyunrestrained specimens. The volumetric strain depends on aggregate composition, characteristic and latency time, moisture ambient conditions and temperature. The mechanical material model is formulated on a macro scale, taking unrestrained volumetric strain as the main input. The volumetric strain governs deterioration of material characteristics (tensile strength, compressive strength, fracture energy) and contributes as an eigenstrain to material behaviour. The growths of ASR gel follows stress state where high compression inhibits further expansion and prevents further deterioration. A fracture-plastic material model for concrete delivers strain decomposition, stress, damage and plastic behaviour. Validation focuses on macroscopically stress-free specimens where correct expansion is obtained. An example of reinforced concrete beam shows excellent performance for internally restrained concrete. The model has been implemented in ATENA software and extends its capability to examine lifetime of the structure.

Název v anglickém jazyce

MODELING ALKALI-SILICA-REACTION IN REINFORCED CONCRETE STRUCTURES COMBINING KINETICS AND FRACTURE MECHANICS

Popis výsledku anglicky

Alkali-silica reaction (ASR) is a reaction in concrete between alkali hydroxides and reactive siliceous aggregates. The paper presents a chemo-mechanical weakly coupled model for ASR. The chemical model predicts kinetics and volume expansion of macroscopicallyunrestrained specimens. The volumetric strain depends on aggregate composition, characteristic and latency time, moisture ambient conditions and temperature. The mechanical material model is formulated on a macro scale, taking unrestrained volumetric strain as the main input. The volumetric strain governs deterioration of material characteristics (tensile strength, compressive strength, fracture energy) and contributes as an eigenstrain to material behaviour. The growths of ASR gel follows stress state where high compression inhibits further expansion and prevents further deterioration. A fracture-plastic material model for concrete delivers strain decomposition, stress, damage and plastic behaviour. Validation focuses on macroscopically stress-free specimens where correct expansion is obtained. An example of reinforced concrete beam shows excellent performance for internally restrained concrete. The model has been implemented in ATENA software and extends its capability to examine lifetime of the structure.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

<a href="/cs/project/7D17001" target="_blank" >7D17001: BIM - based Cyber-physical System for Bridge Assessment</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 6th. European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) ECCM 6 7th. European Conference on Computational Fluid Dynamics ECFD 7

ISBN

978-84-947311-6-7

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

1211-1222

Název nakladatele

International Center for Numerical Methods in Engineerin (CIMNE)

Místo vydání

Barcelona, Spain

Místo konání akce

Glasgow, Scotland, UK

Datum konání akce

11. 6. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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