MICROMECHANICAL CHARACTERIZATION OF CEMENT PASTE MODIFIED BY NANOCLAYS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00343041" target="_blank" >RIV/68407700:21110/20:00343041 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.14311/APP.2020.27.0101" target="_blank" >https://doi.org/10.14311/APP.2020.27.0101</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/APP.2020.27.0101" target="_blank" >10.14311/APP.2020.27.0101</a>

Result language

angličtina

Original language name

MICROMECHANICAL CHARACTERIZATION OF CEMENT PASTE MODIFIED BY NANOCLAYS

Original language description

This work deals with the comparison of micromechanical properties and microstructure of cement pastes with additives used in concrete to reduce the lateral pressure on the formwork. This work is a steppingstone for broader investigation of the lateral pressures on different cement mixtures. The work focused on two additives used for the purpose, namely calcined clay (metakaolin) and a type of nanoclay sepiolite. A scanning electron microscope was used to describe their microstructure. Micromechanical properties of both cement composites were investigated by nanoindentation. Large statistical grids of indents were performed on three sample types: plain cement paste and two mixtures containing the enhancing additive of metakaolin and nanoclay. From the evaluated results in the form of property histograms, the modulus of elasticity, hardness and creep parameter were derived. It was found that in the cement paste with metakaolin the amount of C-S-H gel increased compared to the control mixture. Increased portlandite and the amount of unhydrous clinker was found in the cement paste with nanoclay. Nanomechanical response of individual phases was derived from overall property histograms by statistical deconvolution. The results were confirmed by electron microscopy. The micromechanical research was supplemented with the measurement of the compressive strength on cubes at the macroscopic level.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

<a href="/en/project/FW01010521" target="_blank" >FW01010521: Microstructural modifications of self-compacting concrete to reduce formwork pressures</a><br>

Continuities

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

Publication year

2020

Confidentiality

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

Article name in the collection

14th INTERNATIONAL CONFERENCE ON LOCAL MECHANICAL PROPERTIES - LMP 2019

ISBN

978-80-01-06735-2

ISSN

2336-5382

e-ISSN

—

Number of pages

6

Pages from-to

101-106

Publisher name

České vysoké učení technické v Praze

Place of publication

Praha

Event location

CIIRC, Praha

Event date

Nov 6, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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