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Microstructure of cement paste subject to early carbonation curing
Abstract
Abstract Microstructure of Ordinary Portland Cement paste subjected to early age carbonation curing was studied to examine the effect of early carbonation on performance of paste at different ages. The study was intended to understand the mechanism of concrete carbonation at early age through the microstructure development of its cement paste. Early carbonation was carried out after 18-hour initial controlled air curing. The microstructure characterized by XRD, TGA, 29 Si NMR and SEM was correlated to strength gain, CO 2 uptake and pH change. It was found that early carbonation could accelerate early strength while allowing subsequent hydration. The short term carbonation created a microstructure with more strength-contributing solids than conventional hydration. Calcium hydroxide was converted to calcium carbonates, and calcium–silicate–hydrate became intermingled with carbonates, generating an amorphous calcium–silicate–hydrocarbonate binding phase. Carbonation modified C–S–H retained its original gel structure. The re-hydration procedure applied after carbonation was essential in increasing late strength and durability.
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Review on carbonation curing of cement-based materials
Zhang, D., Ghouleh, Z., & Shao, Y. (2017) · Journal of CO2 Utilization · doi:10.1016/j.jcou.2017.07.003 · Cited by 809
Self-citationCarbonation of cement-based materials: Challenges and opportunities
Ashraf, W. (2016) · Construction and Building Materials · doi:10.1016/j.conbuildmat.2016.05.080 · Cited by 657
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
Li, N., Farzadnia, N., & Shi, C. (2017) · Cement and Concrete Research · doi:10.1016/j.cemconres.2017.07.008 · Cited by 488
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Metadata
- Authors
- Rostami, V., Shao, Y., Boyd, A. J., & He, Z.
- Venue
- Cement and Concrete Research
- Publisher
- Elsevier BV
- Published
- 2012-01
- Volume
- 42
- Issue
- 1
- Pages
- 186-193
- ISSN
- 0008-8846 (ISSN-L)
- OpenAlex
- W2054079015
- Cited by
- 686
- References
- 0
- FWCI
- 23.11
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
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- Rostami, V., Shao, Y., Boyd, A. J., & He, Z. (2012). Microstructure of cement paste subject to early carbonation curing. Cement and Concrete Research. https://doi.org/10.1016/j.cemconres.2011.09.010
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