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A comprehensive study of early reaction of slag with strongly alkaline solutions

AuthorsPalacios, Marta ; Gismera Diez, Sara; Alonso, M. M.; Blanco-Varela, María Teresa; d'Espinose de Lacaillerie, Jean-Baptiste; Lothenbach, Barbara; Carmona-Quiroga, Paula María ; Puertas, F.
Issue Date2018
CitationInternational Conference on Construction Research (2018)
AbstractPartial and/or total replacement of clinker Portland cement by supplementary cementitious materials is one of the main strategies to reduce the environmental impact of Portland cement. In particular, alkali-activated slag cements are produced by mixing blast furnace slag with strongly alkaline solutions. These cements are characterized by high mechanical properties and durability, mainly when waterglass is used as alkaline activator. However, a very poor rheological behaviour of these alternative cements has been also reported, with a loss of fluidity during the first 30 minutes. In this paper, a careful fundamental approach has been applied to understand the origin of such poor rheological behaviour and its link with the early hydration of the slag. In particular, the reaction of the slag has been investigated by SEM, FTIR, in-situ synchrotron XRD and 27Al MAS NMR techniques. Furthermore, the evolution of the composition of the pore solution has been measured over time.
DescriptionResumen del póster presentado a la International Conference on Construction Research / Eduardo Torroja: Architecture, Engineering, Concrete (AEC), celebrada en el Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC-CSIC) del 21 al 23 de noviembre de 2018.
Appears in Collections:(IETCC) Comunicaciones congresos
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