$Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction$

Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction

When exposed to elevated temperatures, concrete suffers physicochemical changes, resulting in reduction of mechanical properties, cracking and spalling. These macroscopic changes are related to changes in the microstructure of concrete. In this paper, the microstructure of thermally damaged concrete...

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Main Authors:	Bruno Fernandes, Augusto Masiero Gil, Fabrício Longhi Bolina, Bernardo Fonseca Tutikian
Format:	Article
Language:	English
Published:	Universidad Nacional de Colombia 2018-10-01
Series:	Dyna
Subjects:	concrete high temperature microstructure scanning electron microscopy (SEM) x-ray diffraction (XRD)
Online Access:	https://revistas.unal.edu.co/index.php/dyna/article/view/70593

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spelling	doaj-4e440ece7e1445b981441e7ad36db20b2020-11-25T00:01:19ZengUniversidad Nacional de Colombia Dyna0012-73532346-21832018-10-018520712312810.15446/dyna.v85n207.7059349621Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffractionBruno Fernandes0Augusto Masiero Gil1Fabrício Longhi Bolina2Bernardo Fonseca Tutikian3Universidade do Vale do Rio dos SinosUniversidade Estadual de CampinasUniversidade do Vale do Rio dos SinosUniversidade do Vale do Rio dos SinosWhen exposed to elevated temperatures, concrete suffers physicochemical changes, resulting in reduction of mechanical properties, cracking and spalling. These macroscopic changes are related to changes in the microstructure of concrete. In this paper, the microstructure of thermally damaged concrete from real-scale reinforced concrete columns was studied, using scanning electron microscopy (SEM) and x-ray diffraction (XRD). Two real-scale reinforced concrete columns, with different concrete mixtures, were exposed to ISO 834 firestandard curve for 4 hours. After heating, concrete core samples were drilled, sectioned and analyzed in different column section depths.Core samples from reference column not exposed to high temperatures, were also obtained. Macroscopic observations showed a change inthe color of concrete exposed to high temperatures. SEM micrographs presented distinct changes in morphology, like coarsening, and thepresence of cracks and voids. XRD diagrams showed a reduction of portlandite and presence of larnite as depth increases.https://revistas.unal.edu.co/index.php/dyna/article/view/70593concretehigh temperaturemicrostructurescanning electron microscopy (SEM)x-ray diffraction (XRD)
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Bruno Fernandes Augusto Masiero Gil Fabrício Longhi Bolina Bernardo Fonseca Tutikian
spellingShingle	Bruno Fernandes Augusto Masiero Gil Fabrício Longhi Bolina Bernardo Fonseca Tutikian Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction Dyna concrete high temperature microstructure scanning electron microscopy (SEM) x-ray diffraction (XRD)
author_facet	Bruno Fernandes Augusto Masiero Gil Fabrício Longhi Bolina Bernardo Fonseca Tutikian
author_sort	Bruno Fernandes
title	Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction
title_short	Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction
title_full	Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction
title_fullStr	Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction
title_full_unstemmed	Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction
title_sort	thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and x-ray diffraction
publisher	Universidad Nacional de Colombia
series	Dyna
issn	0012-7353 2346-2183
publishDate	2018-10-01
description	When exposed to elevated temperatures, concrete suffers physicochemical changes, resulting in reduction of mechanical properties, cracking and spalling. These macroscopic changes are related to changes in the microstructure of concrete. In this paper, the microstructure of thermally damaged concrete from real-scale reinforced concrete columns was studied, using scanning electron microscopy (SEM) and x-ray diffraction (XRD). Two real-scale reinforced concrete columns, with different concrete mixtures, were exposed to ISO 834 firestandard curve for 4 hours. After heating, concrete core samples were drilled, sectioned and analyzed in different column section depths.Core samples from reference column not exposed to high temperatures, were also obtained. Macroscopic observations showed a change inthe color of concrete exposed to high temperatures. SEM micrographs presented distinct changes in morphology, like coarsening, and thepresence of cracks and voids. XRD diagrams showed a reduction of portlandite and presence of larnite as depth increases.
topic	concrete high temperature microstructure scanning electron microscopy (SEM) x-ray diffraction (XRD)
url	https://revistas.unal.edu.co/index.php/dyna/article/view/70593
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Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction

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