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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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Afzal, Waheed
University of Aberdeen
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024Investigating the quantum size effects of multi-walled carbon nanotubes (MWCNTs) in photocatalytic fermentative biohydrogen productioncitations
- 2024Investigating the effects of nano-Fe₃O₄ and MWCNTs on the filtration and rheological properties of water-based muds at elevated temperature and pressurecitations
- 2024Plant Biomass Seed and Root Mucilagecitations
- 2022Effect of Adding Monohydrocalcite on the Microstructural Change in Cement Hydrationcitations
- 2022Evidence of scawtite and tilleyite formation at ambient conditions in hydrated Portland cement blended with freshly-precipitated nano-size calcium carbonate to reduce greenhouse gas emissionscitations
- 2022The physicochemical properties of Portland cement blended with calcium carbonate with different morphologies as a supplementary cementitious materialcitations
Places of action
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article
Evidence of scawtite and tilleyite formation at ambient conditions in hydrated Portland cement blended with freshly-precipitated nano-size calcium carbonate to reduce greenhouse gas emissions
Abstract
<p>Activated calcium carbonate (a-CaCO<sub>3</sub>) is used partially to replace Portland cement. a-CaCO<sub>3</sub> is comprised of nanoscale calcium carbonate, in amorphous and calcite forms, and its enhanced carbonate activity converts calcium carbonate from being an inert filler to a reactive component. Its reaction with the C–S–H phase alters the conventional hydrate mineralogy with spontaneous formation at ∼20 °C of scawtite, Ca<sub>7</sub>(Si<sub>6</sub>O<sub>18</sub>)CO<sub>3</sub>·2H<sub>2</sub>O and tilleyite, Ca<sub>5</sub>Si<sub>2</sub>O<sub>7</sub>(CO<sub>3</sub>)<sub>2</sub>. Compressive strength measurements show that up to 20 mass% cement replacement by calcium carbonate does not decrease 7- and 28-day compressive strengths compared to a Portland cement benchmark. a-CaCO<sub>3</sub> also accelerates the hydration of silicate clinker minerals. Using activated calcium carbonate as a supplementary cementing material enables substantial reduction of CO<sub>2</sub> emissions, firstly by capturing part of the CO<sub>2</sub> from cement kilns to make nanoscale calcium carbonate and secondly, by using the a-CaCO<sub>3</sub> capture product to replace part of the cement.</p>