Pozzolanic reactivity of silico-aluminous fly ash--颗粒学报PARTICUOLOGY

Adamiec, P., Benezet, J.-C., & Benhassaine, A. (2008). Pozzolanic reactivity of silico-aluminous fly ash. Particuology, 6(2), 93–98. https://doi.org/10.1016/j.partic.2007.09.003

Pozzolanic reactivity of silico-aluminous fly ash

Pierre Adamiec, Jean-Charles Benezet^*, Ali Benhassaine

Ecole des Mines d’Alès 6, Avenue de Clavières, 30319 ALES Cedex, France

10.1016/j.partic.2007.09.003

Volume 6, Issue 2, April 2008, Pages 93-98

Received 26 June 2007, Accepted 21 September 2007, Available online 20 March 2008.

E-mail: Jean-Charles.Benezet@ema.fr

Highlights

Abstract

For some years it has been possible to control the particle size of fly ashes, by-products of thermal power stations. Incorporating these very fine particles (obtained by grinding and/or pneumatic selection) improves the physical–mechanical characteristics of mortars and concretes. In this study, we measured the lime consumption of the various fractions (granulometric and densimetric) and identified by X-ray diffraction the neoformed phases by the pozzolanic reaction, to show that it is not sufficient to simply define the pozzolanicity of products based on lime consumption since it does not take into account the nature of the phases formed. The size of the particles used in the test samples also has a determining effect on the quantity of lime consumed. Before comparing results, it is necessary to ensure that the size of the particles (of the global ash and its constituents) be the same. Two distinct neoformed phases appear: CSH in the largest granular fractions (d > 40 μm) and C₃AH₆ in the smaller fractions.

Graphical abstract

Keywords

Fly ash; Pozzolanic reaction; Particle size

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