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Title: The hydration, microstructure, and mechanical properties of vaterite calcined clay cement (VC3)

Journal Article · · Cement and Concrete Research

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. Finally, 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.

Research Organization:
Office of Scientific and Technical Information (OSTI), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
ostiprod; AC52-07NA27344
OSTI ID:
2341245
Alternate ID(s):
OSTI ID: 2287735
Report Number(s):
LLNL-JRNL-849052
Journal Information:
Cement and Concrete Research, Vol. 175; ISSN 0008-8846
Country of Publication:
United States
Language:
English

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