Limestone (calcite) calcined clay cement (LC3) is a promising low-CO2 binder, but the low activity of calcite cannot compensate the reduction in clinker factor, resulting in low one-day strength and limiting its broad applications. As recent carbon capture and utilization technologies allow scalable production of vaterite, a more reactive CaCO3 polymorph, we overcome the challenge by introducing vaterite calcined clay cement (VC3), inspired by the vaterite-calcite phase change. In the present study, VC3 exhibits higher compressive strengths and faster hydration than LC3. Compared to hydrated LC3, hydrated VC3 exhibits increased amount of hemi- and mono-carboaluminate formation and decreased amount of strätlingite formation. With gypsum adjustment, the 1-day strength of VC3 is higher than that of pure cement reference. VC3, a low-CO2 binder, presents great potential as a host of the metastable CaCO3 for carbon storage and utilization and as an enabler of carbon capture at gigaton scales.
Y. Li et al., "The Hydration, Microstructure, And Mechanical Properties Of Vaterite Calcined Clay Cement (VC³)," Cement and Concrete Research, vol. 175, article no. 107374, Elsevier, Jan 2024.
The definitive version is available at https://doi.org/10.1016/j.cemconres.2023.107374
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Bio-inspired; Carbon storage; Carbon utilization; CCUS; Low-CO cement 2
International Standard Serial Number (ISSN)
Article - Journal
© 2023 Elsevier, All rights reserved.
01 Jan 2024