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Open AccessArticle

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

1
Faculty of Science, Ibn Zohr University, Agadir 80000, Morocco
2
ENSA-El Jadida, Chouaib Doukkali University, El Jadida 1104, Morocco
3
Faculty of Sciences, Mohammed V University, Rabat 10010, Morocco
4
Department of Engineering, University of Perugia, 06125 Perugia, Italy
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2443; https://doi.org/10.3390/app9122443
Received: 3 April 2019 / Revised: 20 May 2019 / Accepted: 11 June 2019 / Published: 14 June 2019
Building retrofitting plays a key-role in energy saving and a growing interest is focused on insulating materials that allow a reduction in heat loss from envelopes with low thickness, by a process of reducing heating and cooling demand. In this context, a complete characterization of the physical properties of Moroccan natural gypsum materials was carried out. Basic information on the mineralogical, microstructure, thermal, mechanical, and acoustic characteristics of the rocks sampled from two Moroccan regions is provided. It was found that mineralogy, porosity, and water content are the main factors governing the development of the structure and the strength of the samples. The measured values of the porosity were 8.94%, the water content varied between 2.5–3.0% for the two studied typologies, coming from Agadir and Safi, respectively. Gypsum powder was used for fabricating samples, which were investigated in terms of thermal and acoustic performance. Thermal properties were measured by means of a hot disk apparatus and values of conductivity of 0.18 W/mK and 0.13 W/mK were obtained for Agadir and Safi Gypsum, respectively. The acoustic performance was evaluated in terms of absorption coefficient and sound insulation, measured by means of a Kundt’s Tube (ISO 10534-2). The absorption coefficients were slightly higher than the ones of conventional plasters with similar thickness. A good sound insulation performance was confirmed, especially for Safi Gypsum, with a transmission loss-value up to about 50 dB at high frequency. View Full-Text
Keywords: Moroccan gypsum; ultrasonic waves; Vickers hardness; gypsum plasters; thermal conductivity; acoustic performance Moroccan gypsum; ultrasonic waves; Vickers hardness; gypsum plasters; thermal conductivity; acoustic performance
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Bouzit, S.; Laasri, S.; Taha, M.; Laghzizil, A.; Hajjaji, A.; Merli, F.; Buratti, C. Characterization of Natural Gypsum Materials and Their Composites for Building Applications. Appl. Sci. 2019, 9, 2443.

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