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Improvement of Recycled Aggregates Properties by Means of CO2 Uptake
Open accessAbstract
Concrete from deconstruction can have a second life in the form of recycled concrete aggregates (RCAs). They unfortunately have poor properties (high porosity and water absorption coefficient (WAC)) with respect to natural aggregates. Accelerated carbonation was implemented to improve the RCA properties and to increase their use by storing carbon dioxide (CO2) in the cement matrix and thereby reduce their environmental impact. This paper aims to perform a parametric study of a process for accelerated carbonation of RCAs to store the largest possible amount of CO2 and improve their properties. This study highlights the fact that each of these parameters affects CO2 storage, with an optimum water content for the maximum CO2 uptake depending on the nature and the source of the RCAs. This optimum is related to the RCA water absorption coefficient by a linear relationship. The results show that accelerated carbonation reduces the water absorption coefficient by as much as 67%. Finally, carbonation also decreases porosity, as observed by mercury intrusion porosimetry, by filling the capillary pores.
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“It is believed that too high moisture content prevents CO 2 from penetrating into the inner part of samples [31,87,91,94,95], therefore compromising CO 2 diffusion and overall carbonation effect.”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [87]
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Metadata
- Authors
- Sereng, M., Djerbi, A., Metalssi, O. O., Dangla, P., & Torrenti, J.-M.
- Affiliations
- Université Gustave Eiffel (FR)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Metalssi, Othman Omikrine
- Venue
- Applied Sciences
- Publisher
- MDPI AG
- Published
- 2021-07-16
- Volume
- 11
- Issue
- 14
- Pages
- 6571
- ISSN
- 2076-3417 (ISSN-L)
- OpenAlex
- W3186194754
- Cited by
- 78
- References
- 56
- Citations by year
- 2026: 15 · 2025: 24 · 2024: 16 · 2023: 16 · 2022: 5 · 2021: 2
- FWCI
- 4.47
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Applied Sciences (publishedVersion, cc-by)
- HAL (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- International Research and Exchanges Board
- Topics
- Physical Sciences › Engineering › Building and Construction › Recycled Aggregate Concrete Performance
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete Corrosion and Durability
- Keywords
- recycled concrete aggregate, accelerated carbonation, CO2 uptake, CO2 sequestration, water absorption coefficient, porosity, carbon sequestration, capillary pores
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