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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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Baldermann, Claudia
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Topics
Publications (5/5 displayed)
- 2021A novel nZVI–bentonite nanocomposite to remove trichloroethene (TCE) from solutioncitations
- 2021Quantitative assessment of microstructural changes of hydrated cement blends due to leaching and carbonation, based on statistical analysis of image datacitations
- 2019Mineralogical and microstructural response of hydrated cement blends to leachingcitations
- 2019Functional and environmental performance optimization of Portland cement-based materials by combined mineral fillerscitations
- 2017Environmental controls and reaction pathways of coupled de-dolomitization and thaumasite formationcitations
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article
Mineralogical and microstructural response of hydrated cement blends to leaching
Abstract
<p>Recent advances in concrete technology have enabled the manufacturing of hydrated cements blended with high levels of supplementary cementitious materials (SCMs). These composites can exhibit mechanical and physical properties similar to ordinary Portland-based cements; yet their equivalent performance in “corrosive” environments has to be proven. In this paper, we describe mineralogical, microstructural and geochemical alteration patterns of hydrated cement pastes, despite adequate curing, containing 10 wt-% up to 70 wt-% replacement of Portland cement by SCMs, due to combined leaching and carbonation attack for 182 days. Such knowledge is highly relevant for assessing degradation features of steel-reinforced concrete in tunnels. The dissolution of portlandite, katoite and tobermorite as well as recrystallization of C-S-H caused the development of a leached layer around the specimen‘s surface. Calcite, vaterite and hydrotalcite precipitated within the altered zone, but no passivation effect due to clogging of pore space by these deposits was observed. The thickness of the altered layer, the amounts of portlandite dissolved and CaCO<sub>3</sub> phases neo-formed, the decrease in the Ca/Si molar ratio of C-S-H and the increase in total porosity were highest in pure cement paste. All hydrated cements blended with different types and levels of SCMs (including metakaolin, silica fume, limestone, granulated slag, and their combinations) have behaved better than the pure cement paste, which demonstrates the equivalent performance of these blended mixes in weakly aggressive environments.</p>