NANOINDENTATION ASSISTED SMALL SCALE TENSILE PROPERTIES OF HYDRATED CEMENT AND AAFA PASTES

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00344463" target="_blank" >RIV/68407700:21110/19:00344463 - 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

NANOINDENTATION ASSISTED SMALL SCALE TENSILE PROPERTIES OF HYDRATED CEMENT AND AAFA PASTES

Popis výsledku v původním jazyce

Nanoindentation is a well established experimental method used for characterization of small scale material properties. Here, nanoindentation is employed as a precise loading tool on samples prepared with Focused Ion Beam (FIB) milling technique. Micrometer sized beam specimens were prepared. Subsequently, they were bent with the aid nanoindenter and fracture characteristics acquired. Evaluation is performed for elastic properties, tensile strength and fracture energy of individual small scale microstructural constituents of cement paste like C-S-H rich phases and CH and N-A-S-H gels in alkali-activated fly ash (AAFA). Very high tensile strengths at the micrometer scale were observed for cement paste hydration products (200-700 MPa) as well as for N-A-S-H gel (340 MPa). The results are consistent with atomistic simulations and multi-scale modeling from available literature. The scaling factor of the tensile properties is caused by the multi-level character of the studied composites that consist of multiple defects in the form of pores, cracks and crystalline inclusions at higher (meso- and macro-) levels and that are not present at the micrometer scale.

Název v anglickém jazyce

NANOINDENTATION ASSISTED SMALL SCALE TENSILE PROPERTIES OF HYDRATED CEMENT AND AAFA PASTES

Popis výsledku anglicky

Nanoindentation is a well established experimental method used for characterization of small scale material properties. Here, nanoindentation is employed as a precise loading tool on samples prepared with Focused Ion Beam (FIB) milling technique. Micrometer sized beam specimens were prepared. Subsequently, they were bent with the aid nanoindenter and fracture characteristics acquired. Evaluation is performed for elastic properties, tensile strength and fracture energy of individual small scale microstructural constituents of cement paste like C-S-H rich phases and CH and N-A-S-H gels in alkali-activated fly ash (AAFA). Very high tensile strengths at the micrometer scale were observed for cement paste hydration products (200-700 MPa) as well as for N-A-S-H gel (340 MPa). The results are consistent with atomistic simulations and multi-scale modeling from available literature. The scaling factor of the tensile properties is caused by the multi-level character of the studied composites that consist of multiple defects in the form of pores, cracks and crystalline inclusions at higher (meso- and macro-) levels and that are not present at the micrometer scale.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA17-05360S" target="_blank" >GA17-05360S: Lomové vlastnosti amorfních a krystalických materiálů stanovené pomocí nanoindentace a fokusovaného iontového svazku v malém měřítku</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures

ISBN

978-2-35158-217-6

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

218-223

Název nakladatele

Rilem Publications s.a.r.l.

Místo vydání

Bagneux

Místo konání akce

Rovinj

Datum konání akce

20. 3. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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