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Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation

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Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation. / Zajac, Maciej; Skibsted, Jørgen; Skocek, Jan et al.

In: Cement and Concrete Research, Vol. 130, No. April, 105990, 2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Zajac, M, Skibsted, J, Skocek, J, Durdzinski, P, Bullerjahn, F & Ben Haha, M 2020, 'Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation', Cement and Concrete Research, vol. 130, no. April, 105990. https://doi.org/10.1016/j.cemconres.2020.105990

APA

Zajac, M., Skibsted, J., Skocek, J., Durdzinski, P., Bullerjahn, F., & Ben Haha, M. (2020). Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation. Cement and Concrete Research, 130(April), [105990]. https://doi.org/10.1016/j.cemconres.2020.105990

CBE

Zajac M, Skibsted J, Skocek J, Durdzinski P, Bullerjahn F, Ben Haha M. 2020. Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation. Cement and Concrete Research. 130(April):Article 105990. https://doi.org/10.1016/j.cemconres.2020.105990

MLA

Vancouver

Zajac M, Skibsted J, Skocek J, Durdzinski P, Bullerjahn F, Ben Haha M. Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation. Cement and Concrete Research. 2020;130(April). 105990. https://doi.org/10.1016/j.cemconres.2020.105990

Author

Zajac, Maciej ; Skibsted, Jørgen ; Skocek, Jan et al. / Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation. In: Cement and Concrete Research. 2020 ; Vol. 130, No. April.

Bibtex

@article{870a9cd6ec6c4349abe048bec16d9815,
title = "Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation",
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.",
keywords = "Alumina-silica gel, Calcite, CO, Concrete fines, Re-hydration",
author = "Maciej Zajac and J{\o}rgen Skibsted and Jan Skocek and Pawel Durdzinski and Frank Bullerjahn and {Ben Haha}, Mohsen",
year = "2020",
doi = "10.1016/j.cemconres.2020.105990",
language = "English",
volume = "130",
journal = "Cement and Concrete Research",
issn = "0008-8846",
publisher = "Pergamon Press",
number = "April",

}

RIS

TY - JOUR

T1 - Phase assemblage and microstructure of cement paste subjected to enforced, wet carbonation

AU - Zajac, Maciej

AU - Skibsted, Jørgen

AU - Skocek, Jan

AU - Durdzinski, Pawel

AU - Bullerjahn, Frank

AU - Ben Haha, Mohsen

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

KW - Alumina-silica gel

KW - Calcite

KW - CO

KW - Concrete fines

KW - Re-hydration

UR - http://www.scopus.com/inward/record.url?scp=85079007974&partnerID=8YFLogxK

U2 - 10.1016/j.cemconres.2020.105990

DO - 10.1016/j.cemconres.2020.105990

M3 - Journal article

AN - SCOPUS:85079007974

VL - 130

JO - Cement and Concrete Research

JF - Cement and Concrete Research

SN - 0008-8846

IS - April

M1 - 105990

ER -