Chemical changes and phase analysis of OPC pastes carbonated at different CO2 concentrations
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NMR analysis about the decalcification of C-S-H gel under different CO2 concentrations is rare, and the resolution of NMR testing in previous studies was not good enough for convincing deconvolution results.
“whereas NMR analysis about the decalcification of C-S-H gel, under different CO 2 concentrations, is rare and the resolution of NMR testing in the previous studies was not good enough for convincing deconvolution results [42].”
From XRD and 29Si MAS NMR study on carbonated cement paste under accelerated carbonation using different concentration of CO2 (2019) · cites this paper as [42]
The peak at -71 ppm was Q0, originating from C3S and C2S.
“The peak with the maximum intensity, locked at -71 ppm, was marked as Q 0 , originating from C 3 S and C 2 S [9,42,45].”
From XRD and 29Si MAS NMR study on carbonated cement paste under accelerated carbonation using different concentration of CO2 (2019) · cites this paper as [42]
Little C-S-H remained after carbonation where the corresponding solution pH was more than 10, though the paste showed as colourless with phenolphthalein solution, consistent with previous studies.
“It should be noted that little C-S-H remained after carbonation where the corresponding solution pH was more than 10 [47,48], though the paste showed as colourless with the phenolphthalein solution, which is consistent with the findings in previous studies [9,42].”
From XRD and 29Si MAS NMR study on carbonated cement paste under accelerated carbonation using different concentration of CO2 (2019) · cites this paper as [42]
Rising CO2 concentration would not continuously enhance carbonation of cement paste.
“In [97], a consistent conclusion was obtained claiming that rising CO 2 concentration would not continuously enhance carbonation of cement paste.”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [97]
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“Additionally, when calcium was totally decalcified from the C-S-H chain, the silica gel presented as Q4—Q3(Al), Q3 and Q4 were also identified as Ca-modified silica gels [34,35].”
BackgroundX-ray Total Scattering Study of Phases Formed from Cement Phases Carbonation
Cuesta, A., De la Torre, A. G., & Aranda, M. A. G. (2021) · Minerals · doi:10.3390/min11050519 · Cited by 14 · see citing works
Spatially resolved nanostructural analysis of disordered phases in carbonated alkali-activated slag
McCaslin, E. R., James, M. C., Almer, J., Cai, Z., Kenesei, P., Park, J.-S., & White, C. E. (2025) · Nature Communications · doi:10.1038/s41467-025-67179-5 · Cited by 6 · see citing works
- Authors
- Castellote, M., Fernandez, L., Andrade, C., & Alonso, C.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Corresponding author
- Castellote, Marta
- Venue
- Materials and Structures
- Published
- 2008-07-09
- Volume
- 42
- Issue
- 4
- Pages
- 515-525
- ISSN
- 0025-5432 (ISSN-L)
- 1359-5997
- 1871-6873
- OpenAlex
- W1978089920
- Cited by
- 470
- References
- 0
- Citations by year
- 2026: 30 · 2025: 44 · 2024: 71 · 2023: 48 · 2022: 50 · 2021: 46 · 2020: 34 · 2019: 32 · 2018: 32 · 2017: 16 · 2016: 17 · 2015: 7 · 2014: 9 · 2013: 10 · 2012: 7
- FWCI
- 20.84
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Materials and Structures (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
- Funders
- Universidad Complutense de Madrid
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete Corrosion and Durability
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Building materials and conservation
- Keywords
- accelerated carbonation, CO2 concentration, ordinary Portland cement paste, calcium carbonate formation, Ca/Si ratio, decalcification, microstructure, natural carbonation
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