Abstract
The coupled CO2–water curing technique has been used for curing Portland cement-based materials, enabling the cement/concrete products with rapid strength development and lower carbon footprints. However, there is still a lack of convincing understanding on the mechanism of the accelerated carbonation reactions of cement. This current work mainly focused on characterizing the C–S–H gel formed in the bulk cement paste prepared with a low water to cement ratio (w/c = 0.18) subjected to a coupled CO2–water curing regime, by using solid state 29Si NMR and infrared spectroscopy together with other common tools. The results indicated that the CO2 curing process led to the formation of C–S–H gel containing more Q2 species than that in the corresponding hydrated pastes. Prolonged CO2 curing incorporated more Al tetrahedra into the C–S–H gel. Meanwhile, both the amorphous carbonates and calcite were formed during the accelerated carbonation reactions, and the calcite crystals could serve as nuclei to accelerate the cement hydration at the early age. Excessive CO2 curing resulted in a deficiency of lime in solution, yielding a structurally modified C–S–H with the absence of interlayered Ca(OH)2, and longer silicate chains as well as a higher polymerization degree when compared to the C–S–H formed in the normally hydrated cement samples.
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Acknowledgements
The authors wish to thank the Hong Kong Polytechnic University (Project of Strategic Importance and Research Institute for Sustainable Urban Development) for funding support. The use of the Solid-State NMR Spectroscopy facility at the College of Materials Science and Engineering, Nanjing Technical University which is supported by Prof. Wang Xiao-Jun, is acknowledged.
Funding
This study was funded by Project of Strategic Importance and Research Institute for Sustainable Urban Development of the Hong Kong Polytechnic University.
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Zhan, B.J., Xuan, D.X., Poon, C.S. et al. Characterization of C–S–H formed in coupled CO2–water cured Portland cement pastes. Mater Struct 51, 92 (2018). https://doi.org/10.1617/s11527-018-1211-2
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DOI: https://doi.org/10.1617/s11527-018-1211-2