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Pomakhina, E., Deneele, D., Gaillot, A.-C., Paris, M. & Ouvrard, G. (2012) Si-29 solid state NMR investigation of pozzolanic reaction occurring in lime-treated Ca-bentonite. Cem. Concr. Res. 42 626–632.
Added by: Laurent Cournède (2016-03-10 21:28:39) |
| Type de référence: Article DOI: 10.1016/j.cemconres.2012.01.008 Numéro d'identification (ISBN etc.): 0008-8846 Clé BibTeX: Pomakhina2012 Voir tous les détails bibliographiques  |
Catégories: ID2M Créateurs: Deneele, Gaillot, Ouvrard, Paris, Pomakhina Collection: Cem. Concr. Res. |
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| Résumé |
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Lime is widely used as additive to improve the mechanical properties of natural soil used in earthworks. However, the physico-chemical mechanisms involved are yet not well understood. In order to develop and optimize this treatment method, a better understanding of the interaction between lime and the minerals of the soils, in particular clay minerals, is required. In this study, Ca-bentonite was treated with 2, 5 and 10 wt.\% of lime during 1 to 98 days. Modifications in the Si local environment were then monitored by solid state nuclear magnetic resonance to investigate the pozzolanic reaction. All the soil mineral phases contribute to the release of Si and to the pozzolanic reaction, with a rapid and total consumption of Si-polymorph and an exacerbated dissolution of montmorillonite. Mechanism of C-S-H formation, function of the Ca content in the system, was found to match the sorosilicate-tobermorite model described in cement systems. (C) 2012 Elsevier Ltd. All rights reserved.
Added by: Laurent Cournède |