| Comparison of surface properties between kaolin and metakaolin in concentrated lime solutions. | |
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MedLine Citation:
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PMID: 19682702 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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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 C(2)ASH(8) (gehlenite) have been identified. |
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Authors:
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K L Konan; C Peyratout; A Smith; J-P Bonnet; S Rossignol; S Oyetola |
Publication Detail:
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Type: Journal Article Date: 2009-07-14 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: 339 ISSN: 1095-7103 ISO Abbreviation: - Publication Date: 2009 Nov |
Date Detail:
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Created Date: 2009-09-01 Completed Date: 2009-10-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: United States |
Other Details:
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Languages: eng Pagination: 103-9 Citation Subset: - |
Affiliation:
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ENSCI-GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Groupe d'Etude des Matériaux Hétérogènes (EA3178), 47-73 avenue Albert Thomas, 87065 Limoges Cedex, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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