| 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 aging and alkali activator on the porous structure of a geopolymer
Abstract
Nitrogen sorption and small- and wide-angle X-ray and neutron scattering techniques were used to study the porous structure of geopolymers, inorganic polymers synthesized by reaction of a strongly alkaline solution and an aluminosilicate source (metakaolin). The effects of aging and the use of alkali activators (Na+, K+) of different sizes were investigated at room temperature. The influence of aging time on the microstructure of both geopolymer matrixes was verified in terms of pore volume and specific surface area. The results suggested a refinement of the porosity and therefore a reduction in the pore volume over time. Regardless of the age considered, some characteristics of the porous network such as pore size, shape and distribution depend on the alkali activator used. Whatever the technique considered, the potassium geopolymer has a greater specific surface area than the sodium geopolymer. According to the scattering results, the refinement of the porosity can be associated with, first, a densification of the solid network and, secondly, a partial closure of the porosity at the nanometre scale. The kinetics are much slower for the sodium geopolymer than for the potassium geopolymer in the six months of observation. © 2014 International Union of Crystallography.