Performance Enhancement of Recycled Concrete Aggregates through Carbonation
Abstract
The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, CO2 reacted with Ca(OH)2 and calcium silicate hydrate (C─S─H) to form CaCO3 and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.
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RCA with small particle sizes appears to have a high CO2 sequestration capacity.
“In general, RCA with small particle sizes appears to have a high CO 2 sequestration capacity [56,81].”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [81]
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References 27 · Cited by 398
- Authors
- Zhang, J., Shi, C., Li, Y., Pan, X., Poon, C.-S., & Xie, Z.
- Affiliations
- Hunan University (CN)
- Engineer, WOWA International Engineering & Consulting Co. Ltd, Shenzhen, Guangzhou 518067, China.
- Hong Kong Polytechnic University (HK)
- Central South University of Forestry and Technology (CN)
- Venue
- Journal of Materials in Civil Engineering
- Published
- 2015-11
- Volume
- 27
- Issue
- 11
- ISSN
- 0899-1561 (ISSN-L)
- 1943-5533
- OpenAlex
- W1972317887
- Cited by
- 398
- References
- 27
- Citations by year
- 2026: 40 · 2025: 43 · 2024: 57 · 2023: 56 · 2022: 53 · 2021: 38 · 2020: 34 · 2019: 21 · 2018: 22 · 2017: 17 · 2016: 14 · 2015: 3
- FWCI
- 25.40
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Materials in Civil Engineering (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
- 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 › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
- Keywords
- recycled concrete aggregate, carbonation, cement paste, porosity, water absorption, crushing value, density, compressive strength, drying shrinkage, flowability, recycled aggregate mortar, calcium silicate hydrate, silica gel
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