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Etude structurale et thermodynamique d'hydrates modèle du ciment

Abstract : The C-S-H phase obtained by cement dissolution/precipitation process is responsible for the cement mechanical properties ; her structure is thought to be similar to Tobermorite (natural mineral). The topic is to study cement cohesion by prospecting lamellar tobermoritic sheets. The lamellar structure of synthesised tobermoritic C-S-H is highlighted : samples with Ca/Si ratio 0.9 are well crystallised. The dehydration/rehydration process study identified the existence of 3 tobermorite phases and thermal behaviour similarities with a "real" cement. We demonstrate the irreversibility of 14-11 Å transition. The study is oriented to understand the cohesion interlayer water role in relation with the two possible 11 Å natural tobermorite structures: Hamid's structure (independents layers) and Merlino's structure (bounded layers). The confrontation between experimental (29Si-RMN and infra-red spectroscopy) and numerical results (ab-initio and free energy minimisation) indicate the Hamid's structure as an acceptable model of Tobermoritic C-S-H. Keywords : Tobermorite, C-S-H, XRD, adsorption isotherms, infra red spectroscopy, NMR, ab-initio, free energy minimisation.
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https://tel.archives-ouvertes.fr/tel-00006001
Contributor : Ahmed Gmira <>
Submitted on : Saturday, May 1, 2004 - 6:30:23 PM
Last modification on : Thursday, March 5, 2020 - 6:49:19 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:02:12 PM

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  • HAL Id : tel-00006001, version 1

Citation

Ahmed Gmira. Etude structurale et thermodynamique d'hydrates modèle du ciment. Matériaux. Université d'Orléans, 2003. Français. ⟨tel-00006001⟩

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