Characterization and Analysis of the Carbonation Process of a Lime Mortar Obtained from Phosphogypsum Waste

María Isabel Romero-Hermida, Antonio María Borrero-López, Vicente Flores-Alés, Francisco Javier Alejandre, José María Franco, Alberto Santos and Luis Esquivias
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María Isabel Romero-Hermida: Department Física de la Materia Condensada, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
Antonio María Borrero-López: Pro2TecS—Chemical Process and Product Technology Centre, Department of Chemical Engineering, ETSI, Campus de El Carmen s/n, University of Huelva, 21071 Huelva, Spain
Vicente Flores-Alés: Department Construcciones Arquitectónicas II, Universidad de Sevilla, Avda. Reina Mercedes n°4, 41012 Sevilla, Spain
Francisco Javier Alejandre: Department Construcciones Arquitectónicas II, Universidad de Sevilla, Avda. Reina Mercedes n°4, 41012 Sevilla, Spain
José María Franco: Pro2TecS—Chemical Process and Product Technology Centre, Department of Chemical Engineering, ETSI, Campus de El Carmen s/n, University of Huelva, 21071 Huelva, Spain
Alberto Santos: Department de Ciencias de la Tierra, Universidad de Cádiz, Campus Universitario de Pto, Real, Puerto Real, 11510 Cádiz, Spain
Luis Esquivias: Department Física de la Materia Condensada, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain

IJERPH, 2021, vol. 18, issue 12, 1-20

Abstract: This work addresses the reuse of waste products as a raw material for lime putties, which are one of the components of mortar. 1:3 Lime/sand mortars very similar to conventional construction mortars were prepared using a lime putty obtained from the treatment of phosphogypsum with sodium hydroxide. The physical, rheological and mechanical properties of this phosphogypsum-derived mortar have been studied, as well as the mineralogical composition, microstructure by scanning electron microscope (SEM) and curing process by monitoring carbonation and ultrasonic propagation velocity. Considering the negative influence of sulphates on the hardened material, the behaviour of the material after sulphates precipitation by adding barium sulphate was additionally tested. Carbonation progressed from the outside to the inside of the specimen through the porous system by Liesegang rings patterns for mortars with soluble sulphates, while the carbonation with precipitated sulphates was controlled by diffusion-precipitation. Overall, the negative influence of low-sulphate contents on the mechanical properties of mortars was verified. It must be highlighted the importance of their precipitation to obtain adequate performance.

Keywords: lime putty; mortar; carbonation; rheology; ultrasound (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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