Details
| Original language | English |
|---|---|
| Article number | 105904 |
| Number of pages | 17 |
| Journal | Cement and Concrete Composites |
| Volume | 157 |
| Early online date | 18 Dec 2024 |
| Publication status | Published - Mar 2025 |
Abstract
This study investigated composite cements with recycled concrete pastes (RCP) and the carbonated analogue, comparing them to Portland and limestone cements. The carbonation curing resulted in a carbonation degree of around 30 %. The presence of supplementary cementitious materials had little impact on the carbonation degree and phase assemblage. Cement pastes consisted of ettringite, calcium carbonate, C-S-H phase and silica gel. This phase assemblage transformed upon further hydration. The alumina-silica gel from cRCP did not contribute significantly to the reactions but modified porosity. The hydrates from RCP carbonated, however did not contributed to the strength evolution. Still, replacing limestone with RCP positively contributes to environmental sustainability by increasing CO2 sequestration. Composite cements had lower strength, but those with carbonated RCP showed higher compressive strength and faster strength evolution. This effect was related to the appreciable porosity distribution compensating for the clinker dilution impact and a fast clinker hydration during the post carbonation curing.
Keywords
- Calcium, Carbonate, Carbonation curing, CO2 sequestration, Kinetics, Phase assemblage, Reaction mechanisms
ASJC Scopus subject areas
- Engineering(all)
- Building and Construction
- Materials Science(all)
- General Materials Science
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In: Cement and Concrete Composites, Vol. 157, 105904, 03.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Carbonation hardening of Portland cement with recycled supplementary cementitious materials
AU - Zajac, Maciej
AU - Bremeier, Raoul
AU - Deja, Jan
AU - Król, Magdalena
AU - Ben Haha, Mohsen
N1 - Publisher Copyright: © 2024 Elsevier Ltd
PY - 2025/3
Y1 - 2025/3
N2 - This study investigated composite cements with recycled concrete pastes (RCP) and the carbonated analogue, comparing them to Portland and limestone cements. The carbonation curing resulted in a carbonation degree of around 30 %. The presence of supplementary cementitious materials had little impact on the carbonation degree and phase assemblage. Cement pastes consisted of ettringite, calcium carbonate, C-S-H phase and silica gel. This phase assemblage transformed upon further hydration. The alumina-silica gel from cRCP did not contribute significantly to the reactions but modified porosity. The hydrates from RCP carbonated, however did not contributed to the strength evolution. Still, replacing limestone with RCP positively contributes to environmental sustainability by increasing CO2 sequestration. Composite cements had lower strength, but those with carbonated RCP showed higher compressive strength and faster strength evolution. This effect was related to the appreciable porosity distribution compensating for the clinker dilution impact and a fast clinker hydration during the post carbonation curing.
AB - This study investigated composite cements with recycled concrete pastes (RCP) and the carbonated analogue, comparing them to Portland and limestone cements. The carbonation curing resulted in a carbonation degree of around 30 %. The presence of supplementary cementitious materials had little impact on the carbonation degree and phase assemblage. Cement pastes consisted of ettringite, calcium carbonate, C-S-H phase and silica gel. This phase assemblage transformed upon further hydration. The alumina-silica gel from cRCP did not contribute significantly to the reactions but modified porosity. The hydrates from RCP carbonated, however did not contributed to the strength evolution. Still, replacing limestone with RCP positively contributes to environmental sustainability by increasing CO2 sequestration. Composite cements had lower strength, but those with carbonated RCP showed higher compressive strength and faster strength evolution. This effect was related to the appreciable porosity distribution compensating for the clinker dilution impact and a fast clinker hydration during the post carbonation curing.
KW - Calcium
KW - Carbonate
KW - Carbonation curing
KW - CO2 sequestration
KW - Kinetics
KW - Phase assemblage
KW - Reaction mechanisms
UR - http://www.scopus.com/inward/record.url?scp=85212834518&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2024.105904
DO - 10.1016/j.cemconcomp.2024.105904
M3 - Article
AN - SCOPUS:85212834518
VL - 157
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
M1 - 105904
ER -