MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION

MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION

In this study, the micromechanical response of two cementitious composites was characterized by nanoindentation. Pure Portland cement paste and Portland cement with 50 vol. % replaced with granulated blast furnace slag (GBFS) paste were investigated at the age of 28 days. Grid nanoindentation, stati...

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Main Author: Jiří Němeček
Format: Article
Language:English
Published: CTU Central Library 2020-03-01
Series:Acta Polytechnica CTU Proceedings
Subjects:
nanoindentation, microstructure, blast furnace slag, cement paste
Online Access:https://ojs.cvut.cz/ojs/index.php/APP/article/view/6382
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spelling doaj-6c984610d34f46fe9f2feddeb5f186bd2020-11-25T02:13:21ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822020-03-01260454910.14311/APP.2020.26.00455000MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATIONJiří Němeček0Jiří Němeček1Czech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicIn this study, the micromechanical response of two cementitious composites was characterized by nanoindentation. Pure Portland cement paste and Portland cement with 50 vol. % replaced with granulated blast furnace slag (GBFS) paste were investigated at the age of 28 days. Grid nanoindentation, statistical deconvolution and scanning electron microscopy were used to characterize the main hydration products. Several grids with approximately 500 indents on each sample were performed to obtain modulus of elasticity, hardness and creep indentation parameter. Similar mechanical phases containing calcium silica hydrate, crystalline calcium hydroxide and un-hydrated clinker were found in both samples varying by volume fraction. Blended cement, moreover, contains a phase of slag hydration products with a significantly lower modulus of elasticity. This phase with a high portion of unreacted GBFS is mostly responsible for the difference of mechanical properties of the whole composite.https://ojs.cvut.cz/ojs/index.php/APP/article/view/6382nanoindentation, microstructure, blast furnace slag, cement paste
collection DOAJ
language English
format Article
sources DOAJ
author Jiří Němeček
Jiří Němeček
spellingShingle Jiří Němeček
Jiří Němeček
MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
Acta Polytechnica CTU Proceedings
nanoindentation, microstructure, blast furnace slag, cement paste
author_facet Jiří Němeček
Jiří Němeček
author_sort Jiří Němeček
title MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
title_short MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
title_full MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
title_fullStr MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
title_full_unstemmed MICRO-MECHANICAL PROPERTIES OF CEMENT AND SLAG COMPOSITES MEASURED BY NANOINDENTATION
title_sort micro-mechanical properties of cement and slag composites measured by nanoindentation
publisher CTU Central Library
series Acta Polytechnica CTU Proceedings
issn 2336-5382
publishDate 2020-03-01
description In this study, the micromechanical response of two cementitious composites was characterized by nanoindentation. Pure Portland cement paste and Portland cement with 50 vol. % replaced with granulated blast furnace slag (GBFS) paste were investigated at the age of 28 days. Grid nanoindentation, statistical deconvolution and scanning electron microscopy were used to characterize the main hydration products. Several grids with approximately 500 indents on each sample were performed to obtain modulus of elasticity, hardness and creep indentation parameter. Similar mechanical phases containing calcium silica hydrate, crystalline calcium hydroxide and un-hydrated clinker were found in both samples varying by volume fraction. Blended cement, moreover, contains a phase of slag hydration products with a significantly lower modulus of elasticity. This phase with a high portion of unreacted GBFS is mostly responsible for the difference of mechanical properties of the whole composite.
topic nanoindentation, microstructure, blast furnace slag, cement paste
url https://ojs.cvut.cz/ojs/index.php/APP/article/view/6382
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AT jirinemecek micromechanicalpropertiesofcementandslagcompositesmeasuredbynanoindentation
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