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Comparison of surface properties between kaolin and metakaolin in concentrated lime solutions

Abstract : The surface adsorption of calcium hydroxide onto kaolin and metakaolin was investigated by monitoring with atomic emission spectroscopy and pH measurements the amounts of ions left in solution after exposing clays to calcium hydroxide solutions of various concentrations. Both clays adsorb calcium and hydroxyl ions but differently. Kaolin adsorbs calcium hydroxide not only at the edges of the clay particles but also onto the basal faces. The adsorbed hydrated calcium ions form a layer on the clay particle surfaces, preventing further dissolution of the clay mineral platelet. Metakaolin shows high pozzolanic activity, which provides the quick formation of hydrated phases at the interfaces between metakaolin and lime solutions. The nature of the hydration products has been investigated using X-ray diffraction (XRD) and differential thermal analysis (DTA). The most important hydrated phases like CSH (hydrated calcium silicate) and C2ASH8 (gehlenite) have been identified.
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Contributeur : Sylvie Rossignol Connectez-vous pour contacter le contributeur
Soumis le : lundi 10 octobre 2011 - 14:24:31
Dernière modification le : samedi 26 mars 2022 - 04:26:36




Léon Konan Koffi, Claire Peyratout, Agnès Smith, Jean-Pierre Bonnet, Sylvie Rossignol, et al.. Comparison of surface properties between kaolin and metakaolin in concentrated lime solutions. Journal of Colloid and Interface Science, 2009, 339 (1), pp.103-109. ⟨10.1016/j.jcis.2009.07.019⟩. ⟨hal-00630582⟩



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