Characteristics and applications of flash metakaolins |
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| Affiliation: | 1. Laboratoire de Chimie Industrielle, Ecole Nationale d''Ingénieurs de Sfax, BP W 3038 Sfax, Tunisia;2. Centre Européen de la Ceramique, Groupe d''Etude des Matériaux Hétérogènes, Ecole Nationale Supérieure de Céramique Industrielle, 12 rue Atlantis, 87068 Limoges, France;1. Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, B7400 JWI Olavarría, Argentina;2. Centro de Tecnología de Recursos Minerales y Cerámica, CONICET La Plata — UNLP, Gonnet, Argentina;1. Université de Toulouse, UPS, INSA, LMDC (Laboratoire Matériaux et Durabilité des Constructions), 135, avenue de Rangueil, F-31 077 Toulouse cedex 4, France;2. GTS (Travaux Géotechniques et Sécurisation), 29 rue des Tâches, 69800 Saint Priest, France;1. Sustainable Materials Management, VITO, Boeretang 200, 2400 Mol, Belgium;2. Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40-2448, 3001 Leuven, Belgium;3. Laboratory of Construction Materials, EPFL, Station 12, 1015 Lausanne, Switzerland |
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| Abstract: | This paper presents physical, chemical and mechanical characteristics of metakaolins obtained from an industrial flash calciner, in order to compare their properties with standard industrial metakaolin produced in a rotary kiln calciner. Three kaolins, with three levels of purity, were calcined by these two different methods to give six different metakaolins for the study. The results showed that the method of calcination did not affect the chemical composition of the metakaolins formed but did influence their physical properties and performance as a supplementary cementitious material when blended with Portland cement, and in geopolymer synthesis. Flash metakaolins have a lower water demand than rotary metakaolins, which can be explained by the morphological properties of the flash metakaolin, induced by the calcination process. Traditional rotary-calcined metakaolins tend to be angular layered particles, whereas flash metakaolins contain spherical particles. Mechanical test results showed that the two methods of calcination can lead to metakaolins with equivalent performance in the synthesis of construction materials. |
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