Du, Xiaoyun;
Chang, Jun;
Lin, Leqing;
Peng, Xueping;
Han, Hui;
Bai, Yun;
(2025)
Performance differences and mechanism of carbonation-hardened compacts produced with different C2S polymorphs: A new perspective of carbonatable binder.
Cement and Concrete Composites
, 163
, Article 106216. 10.1016/j.cemconcomp.2025.106216.
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Abstract
This study investigated the carbonation hardening of the compacts produced with three different C2S polymorphs, namely, α′L-C2S, β-C2S and γ-C2S, under identical carbonation conditions. The mechanisms behind the conflict in compressive strength and carbonation degree among the three C2S polymorphs were analyzed by examining the carbonation products, microstructure and pore structure of the compacts. The results indicate a difference in compressive strength among the three C2S compacts as: β>α′L>γ, with a ratio of approximately 1.99:1.64:1. The difference in carbonation degree of the three C2S compacts differ as follows: γ>α′L>β, with a ratio of roughly 1.26:1.13:1. The main reason for the discrepancy in the trend between compressive strength and carbonation degree in the three C2S compacts could be primarily attributed to the proportion of volume increase. A new perspective can be conceptualized as the greater the change in solid phase volume before and after carbonation, the higher the compressive strength and the lower the carbonation degree, and vice versa. The physical characteristics, quantity, and microstructure of the three C2S carbonation products could only be considered as secondary factors. Compacts with a well-balanced aragonite-calcite ratio facilitates tight particle consolidation, which directly contributes to elevated compressive strength.
| Type: | Article |
|---|---|
| Title: | Performance differences and mechanism of carbonation-hardened compacts produced with different C2S polymorphs: A new perspective of carbonatable binder |
| DOI: | 10.1016/j.cemconcomp.2025.106216 |
| Publisher version: | https://doi.org/10.1016/j.cemconcomp.2025.106216 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | BEHAVIOR, CALCIUM SILICATES, Carbon capture, Carbonatable binder, CEMENT, CO2 sequestration binder, Construction & Building Technology, Crystal morphology, Dicalcium silicate, DICALCIUM SILICATE, Materials Science, Materials Science, Composites, MICROSTRUCTURE, REACTIVITY, Science & Technology, Technology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10214772 |
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