| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Poulesquen, Arnaud
CEA Marcoule
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Ultrasound-induced Softening of Nuclear Sludges
- 2024Attractive carbon black dispersions: structural and mechanical responses to shearcitations
- 2024Enhancing 3D Printability of Metakaolin-Based Geopolymers for Nuclear Waste Filtration Applications
- 2024Enhancing 3D Printability of Metakaolin-Based Geopolymers for Nuclear Waste Filtration Applications
- 2024Enhancing 3D Printability of Metakaolin-Based Geopolymers for Liquid Waste Filtration Applications
- 2024Incorporation of organic liquid waste in alkali activated mixed fly ash/blast furnace slag/metakaolin-based geopolymers
- 2023Transient Buoyant Convection of A Highly Thermodependant Viscous Fluid in A 3D Cylindrical Drum
- 2023Ultrasound Flow Imaging coupled to Classical Rheology for characterization of a Yield Stress Sludge
- 2022Water uptake-induced pressure development by French bituminized radioactive waste products in nearly constant volume conditionscitations
- 2022Quantification of the extent of alkali-silica reaction occurring in cemented waste packages based on simplified model systems
- 2022Study of alkali-silica reaction occurring in cemented waste packages based on simplified model and concrete medium approaches
- 2022Study of alkali-silica reaction occurring in cemented waste packages based on simplified model and concrete medium approaches
- 2017Influence of the yield stress on the evolution of a bubble population in a viscoplastic fluid, consequences on the macroscopic swelling of bitumen drums
- 2016Competitive growth and rising of bubbles in a yield stress fluid. Consequences on the macroscopic swelling of bitumen drumscitations
- 2016Ostwald ripening in a yield-stress fluid under uniform gas productioncitations
- 2016Effect of composition and aging on the porous structure of metakaolin-based geopolymerscitations
- 2016Effect of composition and aging on the porous structure of metakaolin-based geopolymerscitations
- 2014Effect of aging and alkali activator on the porous structure of a geopolymercitations
- 2013Rheological, structural and chemical evolution of bitumen under gamma irradiationcitations
- 2011Influence of Extrusion Conditions on the Rheological Behavior of Nuclear Bituminized Waste Productscitations
- 2011Influence of Extrusion Conditions on the Rheological Behavior of Nuclear Bituminized Waste Productscitations
- 2011Influence of thermomechanical history on chemical and rheological behavior of bitumencitations
Places of action
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article
Effect of composition and aging on the porous structure of metakaolin-based geopolymers
Abstract
<jats:p>A combination of intrusive and small-angle scattering techniques (USAXS/SAXS and SANS) was used to characterize the porous structure of metakaolin-based geopolymers. The influence of the geopolymer paste composition and the aging time in a 100% relative humidity environment at 293 K were studied. The effect of the alkali activator, the water amount and the silica amount were investigated. The results show a strong `ink-bottle' effect, indicating a two-level pore structure: a meso- and macroporous network. Both the alkali activator and the water amount have a significant impact on porosity and microstructure in the studied formulation range. After a period of one month, the pore structure is stable over a period of one year except for a slight closure of pores, revealed by nitrogen sorption and small-angle neutron scattering (SANS). These results highlight the geopolymer stability in these curing conditions. For the first time, SANS combined with the contrast matching technique was used to determine the fraction of closed pores in metakaolin-based geopolymers. It was found that the geopolymer porous network is mainly open and that the fraction of closed pores represents less than 5% of the total pore volume after six months of aging. These conclusions are supported by transmission and scanning electron microscopy observations and by the determination of the chemical composition of the interstitial solution over time.</jats:p>