Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation
By M. Zając, J. Skibsted, J. Skocek, Paweł T. Durdziński, Frank Bullerjahn, Mohsen Ben Haha. 2020
269 citations recorded by the source corpus.
Abstract Carbonation of fines from recycled concrete can significantly lower the CO2 footprint of concrete. Benefits of this approach come from fines' abundance, easiness of carbonation and their potential reactivity upon carbonation. The mechanisms of enforced carbonation have been investigated in this work. By carbonating well hydrated, dried and ground cement paste in an aqueous solution, it is found that portlandite initially reacts with the dissolved CO2 and upon its depletion, other hydrates progressively decalcify. The main carbonation products are calcite and an alumina-silica gel rich in alkalis. The gel has an amorphous structure similar to silica gel, including a range of different Qn(mAl) environments according to 29Si NMR. Calcite precipitates mainly in the space occupied by the solution and on the surface of grains of the paste. Al and Si from the hydrates do not diffuse out of the grains and remain in the space occupied initially by the hydrates.
Subfields: Building and Construction, Civil and Structural Engineering, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/fafe1bb09304af43bc439aae1366abb3ead7bfee
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In Civil and Structural Engineering
In Environmental Engineering
Citations in the corpus
- Technologies and policies to decarbonize global industry: Review and assessment of mitigation drivers through 2070 (2020, background): “Due to the ability for hydrated cement to carbonate, and in doing so uptake CO2, some work has started to quantify potential carbon capture and storage through using crushed concrete and fines at the end-of-life [62,63].”