Comparison of Micromechanical Properties of Interfacial Transition Zone in Fiber-Reinforced Cement Paste Samples of Different Age

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00322723" target="_blank" >RIV/68407700:21110/18:00322723 - 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

Comparison of Micromechanical Properties of Interfacial Transition Zone in Fiber-Reinforced Cement Paste Samples of Different Age

Popis výsledku v původním jazyce

The presented paper is focused on a micromechanical study of ITZ between a steel fiber and the cement matrix on two samples of a different age. The microstructure of ITZ around the fibers is characterized by a smaller portion of clinkers and a higher porosity than in the bulk matrix. Nanoindentation was used to obtain microscale elastic properties such as the modulus of elasticity, hardness, etc. An average modulus of elasticity of ITZ of both samples, calculated from the merged nanoindentation results, showed a general increasing trend of the modulus of elas-ticity as the position of an indent was further from the steel fiber. The same trend was observed in the case of hardness. The average value of the modulus of elasticity was 31 GPa in the ITZ. For hardness the value was deter-mined at about 1.1 GPa. The average value of CIT and creep compliance in the ITZ was found to be mostly same in the studied region. For this area, the average value of CIT was 11.60%. Most of the curves have a similar trend and a similar initial value of about 0.06-0.07 GPa-1 in ITZ for the 1-year-old sample and the 1-month-old sample.

Název v anglickém jazyce

Comparison of Micromechanical Properties of Interfacial Transition Zone in Fiber-Reinforced Cement Paste Samples of Different Age

Popis výsledku anglicky

The presented paper is focused on a micromechanical study of ITZ between a steel fiber and the cement matrix on two samples of a different age. The microstructure of ITZ around the fibers is characterized by a smaller portion of clinkers and a higher porosity than in the bulk matrix. Nanoindentation was used to obtain microscale elastic properties such as the modulus of elasticity, hardness, etc. An average modulus of elasticity of ITZ of both samples, calculated from the merged nanoindentation results, showed a general increasing trend of the modulus of elas-ticity as the position of an indent was further from the steel fiber. The same trend was observed in the case of hardness. The average value of the modulus of elasticity was 31 GPa in the ITZ. For hardness the value was deter-mined at about 1.1 GPa. The average value of CIT and creep compliance in the ITZ was found to be mostly same in the studied region. For this area, the average value of CIT was 11.60%. Most of the curves have a similar trend and a similar initial value of about 0.06-0.07 GPa-1 in ITZ for the 1-year-old sample and the 1-month-old sample.

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/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

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

Mechanika 2018 Proceedings of the 23rd International Scientific Conference

ISBN

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ISSN

1822-2951

e-ISSN

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Počet stran výsledku

5

Strana od-do

183-187

Název nakladatele

Kaunas University of Technology

Místo vydání

Kaunas

Místo konání akce

Druskininkai

Datum konání akce

18. 5. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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