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Open AccessArticle

Verification of the Influence of Loading and Mortar Coating Thickness on Resistance to High Temperatures Due to Fire on Load-Bearing Masonries with Clay Tiles

1
PPGEC, UNISINOS, São Leopoldo, RS 93022-750, Brazil
2
Civil Engineer Program, PPGEC/Itt Performance, UNISINOS, São Leopoldo, RS 93022-750, Brazil
3
Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA
4
Departamento de Civil y Ambiental, Universidad de la Costa, Barranquilla 080020, Colombia
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3669; https://doi.org/10.3390/ma12223669
Received: 30 August 2019 / Revised: 27 October 2019 / Accepted: 29 October 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
Masonry has been widely used as a construction method. However, there is a lack of information on its fire behavior due to the multitude of variables that could influence this method. This paper aimed to identify the influence of loading and mortar coating thickness on the fire behavior of masonry. Hence, six masonries made of clay tiles laid with mortar were evaluated. The mortar coating had a thickness of 25 mm on the face not exposed to high temperatures, while the fire-exposed face had thicknesses of 0, 15, and 25 mm. For each mortar coating thickness, two specimens were tested, with and without loading of 10 tf/m. The real-scale specimens were subjected to the standard ISO 834 fire curve for four hours, during which the properties of stability, airtightness, and thermal insulation were assessed. Results showed that loaded specimens yielded smaller deformations than unloaded ones. Samples that lacked mortar coating on the fire-exposed face underwent fire resistance decrease of 27.5%, while the ones with 15 mm decreased by 58.1%, and the ones with 25 mm decreased by 41.0%. As mortar coating thickness increased, the plane deformations decreased from 40 mm to 29 mm and the thermal insulation properties of the walls improved significantly. For specimens with mortar coating thickness of 25 mm, the load application resulted in a reduction of 23.8% of the thermal insulation, while the unloaded specimen showed a decrease of 43.3%, as well as a modification of its fire-resistance rating. View Full-Text
Keywords: structural masonry; mortar coating; fire resistance structural masonry; mortar coating; fire resistance
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de Souza, R.P.; Pacheco, F.; Prager, G.L.; Gil, A.M.; Christ, R.; de Mello, V.M.; Tutikian, B.F. Verification of the Influence of Loading and Mortar Coating Thickness on Resistance to High Temperatures Due to Fire on Load-Bearing Masonries with Clay Tiles. Materials 2019, 12, 3669.

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