Kinetics of enforced carbonation of cement paste

Maciej Zajac; Jørgen Skibsted; Pawel Durdzinski; Frank Bullerjahn; Jan Skocek; Mohsen Ben Haha

doi:10.1016/j.cemconres.2020.106013

Kinetics of enforced carbonation of cement paste

Maciej Zajac^*, Jørgen Skibsted, Pawel Durdzinski, Frank Bullerjahn, Jan Skocek, Mohsen Ben Haha

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

137 Citations (Scopus)

Abstract

The carbonation mechanisms of ground, hydrated cement pastes that mimic recycled concrete fines are investigated under direct wet carbonation. The carbonation is a sequential processes including dissolution of the hydrates, transport of the dissolved material to the precipitation sites and precipitation of the reaction products. During the first stages of carbonation, when portlandite reacts, the reaction is limited by the amount of dissolved CO₂ and potentially by the calcite precipitation rate. When portlandite is depleted, the kinetics is dominated by the dissolution of other hydrates and diffusion of calcium into the solution. The main carbonation products are calcite and an alumina-silica (hydrate) gel. The hydrotalcite-like phase appears to be stable towards carbonation under the experimental conditions employed in this work. The CO₂ concentration and the paste composition have a limited influence on the reaction mechanisms as well as on products formed.

Original language	English
Article number	106013
Journal	Cement and Concrete Research
Volume	131
Number of pages	25
ISSN	0008-8846
DOIs	https://doi.org/10.1016/j.cemconres.2020.106013
Publication status	Published - May 2020

Keywords

Alumina-silica gel
Calcite
CO
Concrete recycling
Reaction kinetics

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title = "Kinetics of enforced carbonation of cement paste",

abstract = "The carbonation mechanisms of ground, hydrated cement pastes that mimic recycled concrete fines are investigated under direct wet carbonation. The carbonation is a sequential processes including dissolution of the hydrates, transport of the dissolved material to the precipitation sites and precipitation of the reaction products. During the first stages of carbonation, when portlandite reacts, the reaction is limited by the amount of dissolved CO2 and potentially by the calcite precipitation rate. When portlandite is depleted, the kinetics is dominated by the dissolution of other hydrates and diffusion of calcium into the solution. The main carbonation products are calcite and an alumina-silica (hydrate) gel. The hydrotalcite-like phase appears to be stable towards carbonation under the experimental conditions employed in this work. The CO2 concentration and the paste composition have a limited influence on the reaction mechanisms as well as on products formed.",

keywords = "Alumina-silica gel, Calcite, CO, Concrete recycling, Reaction kinetics",

author = "Maciej Zajac and J{\o}rgen Skibsted and Pawel Durdzinski and Frank Bullerjahn and Jan Skocek and {Ben Haha}, Mohsen",

year = "2020",

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doi = "10.1016/j.cemconres.2020.106013",

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T1 - Kinetics of enforced carbonation of cement paste

AU - Zajac, Maciej

AU - Skibsted, Jørgen

AU - Durdzinski, Pawel

AU - Bullerjahn, Frank

AU - Skocek, Jan

AU - Ben Haha, Mohsen

PY - 2020/5

Y1 - 2020/5

N2 - The carbonation mechanisms of ground, hydrated cement pastes that mimic recycled concrete fines are investigated under direct wet carbonation. The carbonation is a sequential processes including dissolution of the hydrates, transport of the dissolved material to the precipitation sites and precipitation of the reaction products. During the first stages of carbonation, when portlandite reacts, the reaction is limited by the amount of dissolved CO2 and potentially by the calcite precipitation rate. When portlandite is depleted, the kinetics is dominated by the dissolution of other hydrates and diffusion of calcium into the solution. The main carbonation products are calcite and an alumina-silica (hydrate) gel. The hydrotalcite-like phase appears to be stable towards carbonation under the experimental conditions employed in this work. The CO2 concentration and the paste composition have a limited influence on the reaction mechanisms as well as on products formed.

AB - The carbonation mechanisms of ground, hydrated cement pastes that mimic recycled concrete fines are investigated under direct wet carbonation. The carbonation is a sequential processes including dissolution of the hydrates, transport of the dissolved material to the precipitation sites and precipitation of the reaction products. During the first stages of carbonation, when portlandite reacts, the reaction is limited by the amount of dissolved CO2 and potentially by the calcite precipitation rate. When portlandite is depleted, the kinetics is dominated by the dissolution of other hydrates and diffusion of calcium into the solution. The main carbonation products are calcite and an alumina-silica (hydrate) gel. The hydrotalcite-like phase appears to be stable towards carbonation under the experimental conditions employed in this work. The CO2 concentration and the paste composition have a limited influence on the reaction mechanisms as well as on products formed.

KW - Alumina-silica gel

KW - Calcite

KW - CO

KW - Concrete recycling

KW - Reaction kinetics

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DO - 10.1016/j.cemconres.2020.106013

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SN - 0008-8846

VL - 131

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 106013

ER -

Kinetics of enforced carbonation of cement paste

Abstract

Keywords

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