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http://bura.brunel.ac.uk/handle/2438/30778| Title: | Hydration behaviors, workability, and strength variations in direct aqueous carbonation (DAC) of Portland cement paste |
| Authors: | Wang, Z Zhou, H Lian, S Meng, T Yu, H Zhou, X Wang, S Ruan, S |
| Keywords: | direct aqueous carbonation;cement paste;carbonization activity;concrete performance;micro-nano structure |
| Issue Date: | 14-Feb-2025 |
| Publisher: | Springer Nature |
| Citation: | Wang, Z. et al. (2025) 'Hydration behaviors, workability, and strength variations in direct aqueous carbonation (DAC) of Portland cement paste', Scientific Reports, 15 (1), 5517, pp. 1 - 21. doi: 10.1038/s41598-025-89875-4. |
| Abstract: | This study investigates the mechanisms behind direct aqueous carbonation in concrete manufacturing, focusing on its effects on workability and strength. Through an analysis of cement paste under varying water-to-cement ratios (0.5, 0.55, and 0.6) and CO2 additive amount (0%, 0.1%, and 1%), the results demonstrate that early carbonation accelerates the setting process. Higher CO2 additive amounts and lower w/c ratios further reduce setting time and fluidity, also increase free water consumption, which negatively affects the pore structure and compressive strength. However, as the transformation of amorphous calcium carbonate to calcite, enhancing hydration during curing and ultimately improving the final compressive strength. This study elucidates the various effects of CO2 addition to cement paste on fresh and hardened paste during the direct aqueous carbonation process, shedding light on how it influences hydration, workability, and strength, contributing to sustainable concrete production. |
| Description: | Data availability: The datasets used and/or analysed during the current study available from the corresponding author on reasonable request. |
| URI: | https://bura.brunel.ac.uk/handle/2438/30778 |
| DOI: | https://doi.org/10.1038/s41598-025-89875-4 |
| Other Identifiers: | ORCiD: Xiangming Zhou https://orcid.org/0000-0001-7977-0718 5517 |
| Appears in Collections: | Dept of Civil and Environmental Engineering Research Papers |
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