Microstructure-Based Evolution Of Compressive Strength Of Blended Mortars: A Continuum Micromechanics Approach
Identifikátory výsledku
Kód výsledku v IS VaVaI
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Výsledek na webu
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DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Microstructure-Based Evolution Of Compressive Strength Of Blended Mortars: A Continuum Micromechanics Approach
Popis výsledku v původním jazyce
The evolution of stiffness and strength belong to the most important properties of mortars. Motivated by an increasing demand for clinker substitution by supplementary cementitious materials (SCMs), this paper presents a multiscale model for prediction of elastic stiffness and compressive strength of blended mortars. Mortars are envisioned as hierarchically organized materials with microstructural phases spanning several orders of magnitude. On the scale of hundreds of nanometers, ”CSH foam” consists of amorphous calcium silicate hydrates mixed with capillary pores which on the scale of hundreds of microns acts as a contiguous matrix reinforced by unhydrated clinker, SCM grains, and by crystalline hydration products forming ”cement paste”. The largest scale of observation describes mortar as quartz sand aggregate inclusions embedded into a contiguous cement paste matrix. Continuum micromechanics homogenization approach is used to upscale stiffness from calcium silicate hydrates, represented by needle-shaped ellipsoids, up to the scale of mortar. Macroscopic quasi- brittle failure of mortar is associated with a concentration of strain energy density-related microscopic stresses within a critically oriented needle-shaped hydrate in ”CSH foam”. Successful model validation on OPC-based and blended mortars provides strong evidence that continuum micromechanics is an efficient tool for quantification of stiffness and compressive strength.
Název v anglickém jazyce
Microstructure-Based Evolution Of Compressive Strength Of Blended Mortars: A Continuum Micromechanics Approach
Popis výsledku anglicky
The evolution of stiffness and strength belong to the most important properties of mortars. Motivated by an increasing demand for clinker substitution by supplementary cementitious materials (SCMs), this paper presents a multiscale model for prediction of elastic stiffness and compressive strength of blended mortars. Mortars are envisioned as hierarchically organized materials with microstructural phases spanning several orders of magnitude. On the scale of hundreds of nanometers, ”CSH foam” consists of amorphous calcium silicate hydrates mixed with capillary pores which on the scale of hundreds of microns acts as a contiguous matrix reinforced by unhydrated clinker, SCM grains, and by crystalline hydration products forming ”cement paste”. The largest scale of observation describes mortar as quartz sand aggregate inclusions embedded into a contiguous cement paste matrix. Continuum micromechanics homogenization approach is used to upscale stiffness from calcium silicate hydrates, represented by needle-shaped ellipsoids, up to the scale of mortar. Macroscopic quasi- brittle failure of mortar is associated with a concentration of strain energy density-related microscopic stresses within a critically oriented needle-shaped hydrate in ”CSH foam”. Successful model validation on OPC-based and blended mortars provides strong evidence that continuum micromechanics is an efficient tool for quantification of stiffness and compressive strength.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
JN - Stavebnictví
OECD FORD obor
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Návaznosti výsledku
Projekt
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Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2016
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
Modern Methods of Experimental and Computational Investigations in Area of Construction II
ISBN
978-3-0357-1092-2
ISSN
1022-6680
e-ISSN
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Počet stran výsledku
7
Strana od-do
121-127
Název nakladatele
Trans Tech Publications Inc.
Místo vydání
Pfaffikon
Místo konání akce
Praha
Datum konání akce
22. 9. 2016
Typ akce podle státní příslušnosti
EUR - Evropská akce
Kód UT WoS článku
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