Durability assessment of reinforced concrete structures due to chloride ingress up and beyond induction period

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00313765" target="_blank" >RIV/68407700:21110/17:00313765 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Durability assessment of reinforced concrete structures due to chloride ingress up and beyond induction period

Popis výsledku v původním jazyce

Chloride ingress in reinforced concrete structures is the main cause for the corrosion of reinforcing steel. This paper presents a new chemo-mechanical model up and beyond induction period, taking into account concrete mix design, supplementary cementitious materials, concrete cover, effect of cracking, and environmental conditions. 1D model for chloride ingress from Kwon is extended for crack effects, which accelerates chloride ingress. Fracture–plastic constitutive model is used for the modelling of externally induced cracks. The influence of cracks is enormous, e.g. crack width 0.3 mm decreases the induction time approximately five times when compared to intact concrete. Once the end of induction period is reached, progressive corrosion stage takes place. The corrosion current density i corr is used for calculating the time of concrete spalling for chlorides. After concrete spalling, reinforcement is subjected to corrosion without any protection. The models are validated using two practical cases; Nougawa bridge from Japan and a strut of a concrete bridge from the Czech Republic.

Název v anglickém jazyce

Durability assessment of reinforced concrete structures due to chloride ingress up and beyond induction period

Popis výsledku anglicky

Chloride ingress in reinforced concrete structures is the main cause for the corrosion of reinforcing steel. This paper presents a new chemo-mechanical model up and beyond induction period, taking into account concrete mix design, supplementary cementitious materials, concrete cover, effect of cracking, and environmental conditions. 1D model for chloride ingress from Kwon is extended for crack effects, which accelerates chloride ingress. Fracture–plastic constitutive model is used for the modelling of externally induced cracks. The influence of cracks is enormous, e.g. crack width 0.3 mm decreases the induction time approximately five times when compared to intact concrete. Once the end of induction period is reached, progressive corrosion stage takes place. The corrosion current density i corr is used for calculating the time of concrete spalling for chlorides. After concrete spalling, reinforcement is subjected to corrosion without any protection. The models are validated using two practical cases; Nougawa bridge from Japan and a strut of a concrete bridge from the Czech Republic.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/TA04031458" target="_blank" >TA04031458: Software pro predikci a modelování životnosti a bezpečnosti dopravních konstrukcí</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

39th IABSE Symposium

ISBN

978-3-85748-153-6

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

2488-2495

Název nakladatele

IABSE c/o ETH Hönggerberg

Místo vydání

Zürich

Místo konání akce

Vancouver

Datum konání akce

19. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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