Microscopic performance of cementitious composite with recycled concrete admixture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00330473" target="_blank" >RIV/68407700:21110/18:00330473 - 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

Microscopic performance of cementitious composite with recycled concrete admixture

Popis výsledku v původním jazyce

The topic of emission reduction and recycling in civil engineering is highly discussed topic over last years. With respect to construction waste production, it is obvious to reuse materials such as concrete. Coarse aggregate recycling and reinforcement rebars separation are the most used procedure in this field so far. Recently, methods including recycling of concrete cementitious matrix were introduced to the market. As such, the concrete matrix consists of matured hydration products of the cement (calcium hydroxide, calcium silica hydrate, etc.) as well as non-hydrated Portland cement particles (clinker), which can represent up to 5 % of the matrix. The focus of this article is placed on microscopic level of cementitious composite with admixture of finely grounded recycled concrete. The impact of recycled addition on micro-structure of the composite, namely the percentage representation of individual material phases, is investigated by image analysis of micro-graphs obtained with scanning electron microscopy. The micro-mechanical performance of each composite is examined with displacement driven grid indentation on several levels of the sample. In consideration of the complexity of the cementitious composite with addition of finely grounded concrete, additional testing of input materials and referential cement paste sample is indispensable to properly distinguish mechanical properties of each composite phase. Young's modulus of individual phases is thus determined from spectral deconvolution of obtained indentation data with respect to the composite structure.

Název v anglickém jazyce

Microscopic performance of cementitious composite with recycled concrete admixture

Popis výsledku anglicky

The topic of emission reduction and recycling in civil engineering is highly discussed topic over last years. With respect to construction waste production, it is obvious to reuse materials such as concrete. Coarse aggregate recycling and reinforcement rebars separation are the most used procedure in this field so far. Recently, methods including recycling of concrete cementitious matrix were introduced to the market. As such, the concrete matrix consists of matured hydration products of the cement (calcium hydroxide, calcium silica hydrate, etc.) as well as non-hydrated Portland cement particles (clinker), which can represent up to 5 % of the matrix. The focus of this article is placed on microscopic level of cementitious composite with admixture of finely grounded recycled concrete. The impact of recycled addition on micro-structure of the composite, namely the percentage representation of individual material phases, is investigated by image analysis of micro-graphs obtained with scanning electron microscopy. The micro-mechanical performance of each composite is examined with displacement driven grid indentation on several levels of the sample. In consideration of the complexity of the cementitious composite with addition of finely grounded concrete, additional testing of input materials and referential cement paste sample is indispensable to properly distinguish mechanical properties of each composite phase. Young's modulus of individual phases is thus determined from spectral deconvolution of obtained indentation data with respect to the composite structure.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA17-06771S" target="_blank" >GA17-06771S: Možnosti využití mikromletého recyklovaného betonu jako mikroplniva s pojivovými vlastnostmi</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

NANOCON 2018 Conference Proceedings

ISBN

978-80-87294-89-5

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

204-209

Název nakladatele

Tanger Ltd.

Místo vydání

Ostrava

Místo konání akce

Hotel Voronez I, Brno

Datum konání akce

17. 10. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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