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10.3390/ma13163582
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Article

Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement

by
Jesús Rodríguez-Sánchez
1,2,
Teresa Liberto
3,4,
Catherine Barentin
4,5 and
Dag Kristian Dysthe
1,*
1
Physics of Geological Processes (PGP), The NJORD Centre, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo, Norway
2
Department of Materials Science and Engineering, University of Sheffield, Sheffield S10 2TN, UK
3
Building Physics and Construction Ecology, Faculty of Civil Engineering, Institute of Materials Technology, Vienna University of Technology, 1030 Vienna, Austria
4
Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, F-69622 Villeurbanne, France
5
Institut Universitaire de France, 75231 Paris, France
*
Author to whom correspondence should be addressed.
Materials 2020, 13(16), 3582; https://doi.org/10.3390/ma13163582
Submission received: 22 July 2020 / Revised: 10 August 2020 / Accepted: 11 August 2020 / Published: 13 August 2020
(This article belongs to the Special Issue Study of Hydraulic Binders: From Mixing to Setting)
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Abstract

Calcium carbonate cements have been synthesized by mixing amorphous calcium carbonate and vaterite powders with water to form a cement paste and study how mechanical strength is created during the setting reaction. In-situ X-ray diffraction (XRD) was used to monitor the transformation of amorphous calcium carbonate (ACC) and vaterite phases into calcite and a rotational rheometer was used to monitor the strength evolution. There are two characteristic timescales of the strengthening of the cement paste. The short timescale of the order 1 h is controlled by smoothening of the vaterite grains, allowing closer and therefore adhesive contacts between the grains. The long timescale of the order 10–50 h is controlled by the phase transformation of vaterite into calcite. This transformation is, unlike in previous studies using stirred reactors, found to be mainly controlled by diffusion in the liquid phase. The evolution of shear strength with solid volume fraction is best explained by a fractal model of the paste structure.
Keywords: phase transformation; hardening; colloidal suspension; calcium carbonate; cement phase transformation; hardening; colloidal suspension; calcium carbonate; cement
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MDPI and ACS Style

Rodríguez-Sánchez, J.; Liberto, T.; Barentin, C.; Dysthe, D.K. Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement. Materials 2020, 13, 3582. https://doi.org/10.3390/ma13163582

AMA Style

Rodríguez-Sánchez J, Liberto T, Barentin C, Dysthe DK. Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement. Materials. 2020; 13(16):3582. https://doi.org/10.3390/ma13163582

Chicago/Turabian Style

Rodríguez-Sánchez, Jesús, Teresa Liberto, Catherine Barentin, and Dag Kristian Dysthe. 2020. "Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement" Materials 13, no. 16: 3582. https://doi.org/10.3390/ma13163582

APA Style

Rodríguez-Sánchez, J., Liberto, T., Barentin, C., & Dysthe, D. K. (2020). Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement. Materials, 13(16), 3582. https://doi.org/10.3390/ma13163582

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