Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures

The paper presents results of exposure of normal concrete to elevated temperatures (400 and 700) °C covered by layers (gypsum and plaster) with different thicknesses (10 and 20) mm. The casted specimens for each type of test were divided into three groups. The first was without covering the concrete...

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Autores principales:	warwar Raid Sattar, said AbdulMuttalib I.
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	beams temperature gypsum plaster fire flame load-deflection Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/fbb59293bec948229200c4b0aef144fe
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spelling	oai:doaj.org-article:fbb59293bec948229200c4b0aef144fe2021-11-12T11:43:50ZFlexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures2267-124210.1051/e3sconf/202131803005https://doaj.org/article/fbb59293bec948229200c4b0aef144fe2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/94/e3sconf_icge2021_03005.pdfhttps://doaj.org/toc/2267-1242The paper presents results of exposure of normal concrete to elevated temperatures (400 and 700) °C covered by layers (gypsum and plaster) with different thicknesses (10 and 20) mm. The casted specimens for each type of test were divided into three groups. The first was without covering the concrete surface with gypsum, while the second and third groups were covered with gypsum of the outer surface with a thickness of 10 and 20 mm, respectively. The experimental results found that the ultimate load capacity and the first crack load of RC beams were improved by using gypsum layers through 400°C. At thickness 10 and 20 mm, the (Pcr and Pu) loss was about (8 and 6) % and (1 and 7) % respectively, compared to the concrete not covered with gypsum, the loss rate is about (25 and 13) %, and this is clear evidence of the benefit of gypsum in reducing the Elevated Temperatures directly to concrete. As for the temperature of 700, the reduction in (Pcr and Pu) was about (57 and 22) % and (31 and 16) % and (10 and 15) % at 0, 10, 20 mm gypsum thickness, respectively. Through the figures shown in the paper, which were obtained from the experimental side of the research, the load-deflection curves improved when the gypsum thickness increased during the specimens' exposure to fire. Where the relationship between them at a temperature of 400°C in a thickness of 20 mm was better than 10 mm when exposed to fire, so by increasing the thickness of the gypsum, the occurrence of deflection is less because it protects the surface of the concrete from direct exposure to heat and thus prevents the occurrence of cracks in the outer surface of the concrete.warwar Raid Sattarsaid AbdulMuttalib I.EDP Sciencesarticlebeamstemperaturegypsumplasterfire flameload-deflectionEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 318, p 03005 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	beams temperature gypsum plaster fire flame load-deflection Environmental sciences GE1-350
spellingShingle	beams temperature gypsum plaster fire flame load-deflection Environmental sciences GE1-350 warwar Raid Sattar said AbdulMuttalib I. Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
description	The paper presents results of exposure of normal concrete to elevated temperatures (400 and 700) °C covered by layers (gypsum and plaster) with different thicknesses (10 and 20) mm. The casted specimens for each type of test were divided into three groups. The first was without covering the concrete surface with gypsum, while the second and third groups were covered with gypsum of the outer surface with a thickness of 10 and 20 mm, respectively. The experimental results found that the ultimate load capacity and the first crack load of RC beams were improved by using gypsum layers through 400°C. At thickness 10 and 20 mm, the (Pcr and Pu) loss was about (8 and 6) % and (1 and 7) % respectively, compared to the concrete not covered with gypsum, the loss rate is about (25 and 13) %, and this is clear evidence of the benefit of gypsum in reducing the Elevated Temperatures directly to concrete. As for the temperature of 700, the reduction in (Pcr and Pu) was about (57 and 22) % and (31 and 16) % and (10 and 15) % at 0, 10, 20 mm gypsum thickness, respectively. Through the figures shown in the paper, which were obtained from the experimental side of the research, the load-deflection curves improved when the gypsum thickness increased during the specimens' exposure to fire. Where the relationship between them at a temperature of 400°C in a thickness of 20 mm was better than 10 mm when exposed to fire, so by increasing the thickness of the gypsum, the occurrence of deflection is less because it protects the surface of the concrete from direct exposure to heat and thus prevents the occurrence of cracks in the outer surface of the concrete.
format	article
author	warwar Raid Sattar said AbdulMuttalib I.
author_facet	warwar Raid Sattar said AbdulMuttalib I.
author_sort	warwar Raid Sattar
title	Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
title_short	Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
title_full	Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
title_fullStr	Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
title_full_unstemmed	Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures
title_sort	flexural behavior of reinforced concrete beams covered by gypsum layers and exposed to elevated temperatures
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/fbb59293bec948229200c4b0aef144fe
work_keys_str_mv	AT warwarraidsattar flexuralbehaviorofreinforcedconcretebeamscoveredbygypsumlayersandexposedtoelevatedtemperatures AT saidabdulmuttalibi flexuralbehaviorofreinforcedconcretebeamscoveredbygypsumlayersandexposedtoelevatedtemperatures
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Flexural Behavior of Reinforced Concrete Beams Covered by Gypsum Layers and Exposed to Elevated Temperatures

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