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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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Bouny, Véronique Baroghel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2022Studying concrete blocks in real environments and comparing to laboratory experiments
- 2019Comparison of various cement pastes with SCM at different ages: phase assemblage evolutions
- 2019Quantification of Bound CO2 in various carbonated
- 2011Interactions between chloride ingress and carbonation in cementitious materials
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document
Quantification of Bound CO2 in various carbonated
Abstract
For economic and ecological reasons, supplementary cementitious materials (SCM) are increasingly used in concrete. Although having a lot of advantages, these concretes have different cement matrices and do not have the same evolution as they are carbonated. In this paper, comparison between various carbonated cement pastes with/without SCM (slag, fly ash and metakaolin), has been investigated. Samples are carbonated in accelerated conditions (1.5 % CO2 , RH 65% and T=20°C) until constant mass but in order to be relatively close to the natural conditions and to simulate a carbonation process in the long term. The microstructure was characterized not only by usual techniques such as XRD and TGA-DTA, but also by 29Si and 27Al NMR spectroscopy. The use of a combination of techniques for microstructural Characterization allows to quantify the proportion of each cementitious phase and to determine how much there are carbonated in comparison to reference cement pastes. This quantification shows the evolution of the carbonated cementitious matrix as a function of the binder content. In addition, the results show that the quantity of bound CO2 is not just dependent of portlandite amount. All phases with calcium participate to the fixation of CO2. However, all these phases are not completely carbonated. Bound CO2 is almost only CaCO3. Four CaCO3 polymorphs are detected : calcite, vaterite, aragonite and amorphous.