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| Naji, M. |
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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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| 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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Hay, Rotana
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Publications (5/5 displayed)
- 2022Shrinkage, hydration, and strength development of limestone calcined clay cement (LC3) with different sulfation levelscitations
- 2022Phase evolution, micromechanical properties, and morphology of calcium (alumino)silicate hydrates C-(A-)S-H under carbonationcitations
- 2020Influencing factors on micromechanical properties of calcium (alumino) silicate hydrate C-(A-)S-H under nanoindentation experimentcitations
- 2020Hydration, carbonation, strength development and corrosion resistance of reactive MgO cement-based compositescitations
- 2019Effect of volcanic ash pozzolan or limestone replacement on hydration of Portland cementcitations
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article
Phase evolution, micromechanical properties, and morphology of calcium (alumino)silicate hydrates C-(A-)S-H under carbonation
Abstract
<p>The study explored the chemical, micromechanical, and morphological evolution of the principal binding phases of Portland cement under carbonation. Accelerated carbonation under 20% CO<sub>2</sub> at 80% relative humidity was applied on C-(A-)S-H powders until equilibrium. The crystallinity of C-(A-)S-H disappeared due to decalcification and subsequent formation of highly polymerized silica gels. A high carbonation content (33.4–35.2%) was achieved. CaCO<sub>3</sub> polymorphs dominated by aragonite and vaterite were observed as the main carbonation products. A significant reduction in the indentation elastic modulus was revealed in compacts produced with carbonated powders. In contrast, compacts followed by carbonation attained an improved micromechanical property, attributed to a reinforcing action of integral CaCO<sub>3</sub> nanocrystallites and pore-filling effects. The carbonated C-(A-)S-H powders achieved an overall lower pore volume and exhibited a more fibrous morphology characterized by thin foils of silica gels bound with CaCO<sub>3</sub> crystals to form agglomerates.</p>