Development of low-carbon cement : Carbonation of compounded C2S by β-C2S and γ-C2S
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 105071 |
Journal / Publication | Cement and Concrete Composites |
Volume | 139 |
Online published | 6 Apr 2023 |
Publication status | Published - May 2023 |
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Abstract
Widespread utilization of Portland cement (PC) with a large-scale carbon footprint has caused a vital climate crisis. The application of low-carbon materials rich in belite is hindered by the low hydraulic activity of C2S. Both β-C2S and γ-C2S can rapidly develop compressive strength and sequestrate CO2 after carbonation. To explore the role of β-C2S and γ-C2S played on compressive strength and carbonation degree in C2S paste, several groups of C2S samples composed of pure β-C2S and pure γ-C2S in different weight contents (wt.%) were homogenized and carbonated. Compressive strength was tested, and XRD, TGA, FT-IR, and SEM analysis methods were applied to observe the carbonation properties. Experimental results showed that compressive strength positively correlated with the proportion of β-C2S content, and the carbonation degree positively correlated with the proportion of γ-C2S content. Different ratios of β-C2S and γ-C2S mainly affected the growth rates of compressive strength and carbonation degree. When β-C2S was 60 wt% and γ-C2S was 40 wt%, both compressive strength (54.4 MPa) and carbonation degree (36.7%) of carbonated samples can reach an optimum value. The calcite content increased with γ-C2S content, while the crystallite size of calcite decreased with the γ-C2S content. Through the established carbonation kinetics equation and the measured carbonation heat curves of compounded C2S, the possible synery effect of β-C2S and γ-C2S was proposed. Combined β-C2S and γ-C2S in cement clinker can reduce CO2 emissions. Carbonating high-belite cement composed of a certain proportion of β-C2S and γ-C2S will contribute to developing early compressive strength and improving CO2 sequestration of this low-carbon cementitious material. © 2023 Elsevier Ltd
Research Area(s)
- Calcium carbonate, Carbonation degree, Compressive strength, β-C2S, γ-C2S
Citation Format(s)
Development of low-carbon cement: Carbonation of compounded C2S by β-C2S and γ-C2S. / Jiang, Ting; Cui, Kai; Chang, Jun.
In: Cement and Concrete Composites, Vol. 139, 105071, 05.2023.
In: Cement and Concrete Composites, Vol. 139, 105071, 05.2023.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review