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Multi-Analysis Characterisation of a Vernacular House in Doha (Qatar): Petrography and Petrophysics of its Construction Materials

1
Department of Geology, UTAD—Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugal
2
Department of Geology, CGeo—Centro de Geociências da Universidade de Coimbra, Rua Silvino Lima, Universidade de Coimbra-Polo II, 3030-790 Coimbra, Portugal
3
Institute of Arab and Islamic Studies (IAIS), University of Exeter, Stocker Road, Exeter EX4 4ND, UK
4
UCL Qatar (University College London), Humanitarium, Education City, P.O. Box 25256, Doha, Qatar
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(4), 241; https://doi.org/10.3390/min9040241
Received: 28 March 2019 / Revised: 16 April 2019 / Accepted: 16 April 2019 / Published: 18 April 2019
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Abstract

This study characterises the original construction materials (building stones and mortars) of a collapsed two-storey colonnaded structure in the Ismail Mandani house, located in the old city centre of Doha (Qatar). Results were drawn based on interpretation and integration of historical, in situ observations and analytical data. The mortars and stones were characterised following a multidisciplinary approach, combining macroscopic observation with petrographic microscopy, mineralogical analysis (X-ray diffraction) and elemental analysis (handheld X-ray fluorescence) of samples. Moreover, hydric properties, ultrasonic pulse velocity and colour of representative samples of the house were studied. The results revealed the use of two types of stones and three different types of gypsum mortars. The original construction materials came from nearby coastal stones. Gypsum of the most used mortar had a calcination temperature between 120 and 160 °C and its colour was produced by lumps with higher Fe content. The materials’ effective porosity and water absorption were high, and their ultrasonic pulse velocity was low. These petrophysical results indicated they had low quality for construction purposes. The composition and colour of the original construction materials were quantified, which will allow the reproduction of their aesthetic characteristics and improvement of their quality in future reconstruction works. View Full-Text
Keywords: mortar; heritage; conservation; building; geoheritage mortar; heritage; conservation; building; geoheritage
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Freire-Lista, D.M.; Kahraman, G.; Carter, R. Multi-Analysis Characterisation of a Vernacular House in Doha (Qatar): Petrography and Petrophysics of its Construction Materials. Minerals 2019, 9, 241.

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