Physico- mechanical and micostructural effects of water/cement ratio on the mortars upon heating

Autor: Messaoudene, Ibrahim, Ezziane, Mohammed, Lahouassa, Ammar, Kaaloul, Souhil, Molez, Laurent
Přispěvatelé: Université Mohamed El Bachir El Ibrahimi [Bordj Bou Arréridj], Université Mohamed Boudiaf de M'sila, École Nationale Polytechnique d'Oran Maurice Audin (ENPO-MA), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES), Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials and Engineering Structures
Journal of Materials and Engineering Structures, Mouloud Mammeri University of Tizi-Ouzou, 2021, 8 (2), pp.279-286
Journal of Materials and Engineering Structures, 2021, 8 (2), pp.279-286
ISSN: 2170-127X
Popis: International audience; This experimental work studies the effect of the W/C ratio on the mechanical properties of the mortars subjected to the high temperatures. Fours mortars were made according to EN196-1standard. A typical mortar mix with W/C = 0.5 and three others mortars with W/C= 0.3; W/C= 0.4 and W/C= 0.6. They were exposed to a slow heating in a muffle furnace until the target temperature (100, 200,300,400,500,600,700 and 800 degrees C) with a step of 2 degrees C.min-1 and cooling to room temperature took place in the closed and disconnected oven (approximately-0.3 degrees C/min). After thermal stress, mortars with high W/C ratio (0.5 and 0.6) show a decrease in compressive strength much greater than those with low W/C ratio (0.3 and 0.4). The flexural strength of different mortars has a similar shape to those of the compressive strength. The weight loss and water absorption results are consistent with the mechanical behavior. The SEM tests were carried out on samples of unheated control cement and cements heated to 400 degrees, 500 degrees and 800 degrees C. The SEM observations explain the mechanical strength. At upper temperature (800 degrees C), the material is too much damaged and measurements become difficult.
Databáze: OpenAIRE
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