Linearity and assessment of micro-scale creep in C-S-H via nanoindentation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00386836" target="_blank" >RIV/68407700:21110/25:00386836 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.21012/FC12.1116" target="_blank" >https://doi.org/10.21012/FC12.1116</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.21012/FC12.1116" target="_blank" >10.21012/FC12.1116</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Linearity and assessment of micro-scale creep in C-S-H via nanoindentation

Popis výsledku v původním jazyce

This paper focuses on quantifying the micro-scale creep compliance of the C-S-H phase in well-hydrated, 1.5-year-old cement paste, measured using grid nanoindentation with a Berkovich tip. Four different load levels were tested to induce varying levels of deformation and stress. The results showed that the measured creep compliance is independent of the maximum vertical force within the range of 1 mN to 3 mN, standardly used in nanoindentation of cement pastes. The same trends and conclusions were observed for a reference polymeric material, PMMA, chosen for its homogeneity. In both cases, the creep falls in the linear viscoelastic regime. The linearity was further checked by calculation of the stress developed beneath the indentation tip. The stress was estimated using a finite element numerical model simulating the contact problem. The calculated stress reached 61.4% of the compressive strength measured by micro-pillar testing, 17.1%–46.1% of the strength measured by micro-beam testing, and 29.0% of the strenght estimated by the multiscale model.

Název v anglickém jazyce

Linearity and assessment of micro-scale creep in C-S-H via nanoindentation

Popis výsledku anglicky

This paper focuses on quantifying the micro-scale creep compliance of the C-S-H phase in well-hydrated, 1.5-year-old cement paste, measured using grid nanoindentation with a Berkovich tip. Four different load levels were tested to induce varying levels of deformation and stress. The results showed that the measured creep compliance is independent of the maximum vertical force within the range of 1 mN to 3 mN, standardly used in nanoindentation of cement pastes. The same trends and conclusions were observed for a reference polymeric material, PMMA, chosen for its homogeneity. In both cases, the creep falls in the linear viscoelastic regime. The linearity was further checked by calculation of the stress developed beneath the indentation tip. The stress was estimated using a finite element numerical model simulating the contact problem. The calculated stress reached 61.4% of the compressive strength measured by micro-pillar testing, 17.1%–46.1% of the strength measured by micro-beam testing, and 29.0% of the strenght estimated by the multiscale model.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA23-05435S" target="_blank" >GA23-05435S: Účinky radiačního působení na nanomechanické vlastnosti cementových kompozitů v proměnných podmínkách prostředí</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 12th International Conference on Fracture Mechanics for Concrete and Concrete Structures

ISBN

978-3-903039-01-8

ISSN

—

e-ISSN

—

Počet stran výsledku

8

Strana od-do

533-540

Název nakladatele

Technische Universität Wien

Místo vydání

Vídeň

Místo konání akce

Vídeň

Datum konání akce

23. 4. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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