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Properties of Calcined Clay Waste and its Influence on Blended Cement Behavior

AutorFrías, Moisés; Rodríguez Largo, Olga; Vegas, Iñigo; Vigil de la Villa, R.
Fecha de publicación19-feb-2008
EditorAmerican Ceramic Society
CitaciónJournal of the American Ceramic Society 91(4): 1226 - 1230 (2008)
ResumenThis paper describes research on clay wastes (CWs) produced in the paper manufacture process. Once activated under controlled thermal conditions, CW is transformed into calcined clay products providing added value as supplementary cementing materials. The obtention of a pozzolanic material (metakaolin (MK)) from valorized CW constitutes an alternative source of pozzolans for the elaboration of blended Portland cements, as well as a priority research line from the environmental point of view. This research work presents the properties of calcined CW (chemical, mineralogical, and pozzolanic) and its influence on Portland cements containing 10% calcined clay product. The results obtained with different characterization techniques (XRF, DTA, XRD, SEM-EDX) showed that the thermally activated CW exhibits acceptable properties to be used as supplementary cementing materials in the manufacture of commercial Portland cements. The derived MK can react with calcium hydroxide, from cement hydration, producing hydrated phases with hydraulic properties (calcium silicate hydrate gels, tobermorite, C4AH13, zeolite). These novel blended cements comply with the chemical, physical, and mechanical specifications established in the existing standards.
Versión del editorhttp://dx.doi.org/10.1111/j.1551-2916.2008.02289.x
ISSN1551-2916 (Online)
0002-7820 (Print)
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