Jaffel, Hamouda (2006) Multi-scales characterisation of porous materials in evolution: case of the plaster. PhD thesis PMC, EP - PMC, EP/X p.180.
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Alternative Locations: http://www.imprimerie.polytechnique.fr/Theses/Files/Jaffel_.pdf
Abstract
We report a comprehensive and non-destructive study of the hydration kinetics and of the microstructure evolution of plaster pastes, by low magnetic field proton Nuclear Magnetic Resonance (NMR) Relaxometry. This technique enables to follow continuously and non-destructively the degree of hydration and the evolution of the microstructure during the setting and hardening of plas!
ter pastes. The bi-exponential transverse magnetization decay !
reveals the existence of two water populations in slow exchange. Using the NMR relaxometry measurements, two modes of organization of the microstructure of this material are identified, as a function of the initial water to plaster ratio (w/p), for 0.4 <= w/p <= 0.6 and 0.7 <= w/p <= 1. An original model of exchange between water populations in a porous medium was established. A new multi-scale and multi-technique approach is proposed to relate continuously the microstructure and the macroscopic mechanical properties of the evolving porous medium (measured by ultrasound). The experimental approach and the modelling presented here can be applied to other porous media with evolving microstructures.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| Thesis Supervisor: | Korb, Jean-Pierre |
| Date: | December 2006 |
| Board of examiners: | Coussy, Olivier and Damidot, Denis and McDonald, Peter and Baroghel Bouny, Véronique and Gartner, Ellis and Ndobo-Epoy, Jean-Philippe |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | PMC |
| Collection (Fonds): | EP/X |
| Institution: | EP/X |
| Department: | EP - PMC |
| Subjects: | 3. Physics, Optics |
| Uncontrolled Keywords: | Porous media, Microstructure, Porosity, Specific surface area, Pore size distribution, Multi-scale approach, Degree of hydration, Hydration, Setting, Plaster paste, Gypsum, Proton NMR, Relaxation time, Relaxometry, Exchange model, Milieux poreux, Microstructure, Porosité, Surface spécifique, Distribution de tailles de pores, Approche multi-échelles, Degré dhydratation, Hydratation, Texturation, Pâte de plâtre, Gypse, RMN du proton, Relaxation, échange de protons |
| ID Code: | 2094 |
|---|---|
| Deposited By: | Laurence Vidament |
| Deposited On: | 17 January 2007 |
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