Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 22 October 2018 / Approved: 23 October 2018 / Online: 23 October 2018 (08:10:14 CEST)

How to cite: Rodríguez-Sánchez, J.; Liberto, T.; Barentin, C.; Dysthe, D.K. Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement. Preprints 2018, 2018100526 (doi: 10.20944/preprints201810.0526.v1). Rodríguez-Sánchez, J.; Liberto, T.; Barentin, C.; Dysthe, D.K. Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement. Preprints 2018, 2018100526 (doi: 10.20944/preprints201810.0526.v1).

Abstract

Calcium carbonate cements have been synthesized by mixing amorphous calcium carbonate and vaterite powders with water to unravel the mechanisms of creating mechanical strength during the setting reaction. In-situ XRD was used to monitor the transformation of ACC and vaterite phases into calcite. Unlike this transformation of crystals suspended in a stirred solution, the transformation in the cement is controlled by vaterite dissolution. The supersaturation within the cement paste, Ω, depends not only on the bulk free energy difference of the phases, ΔG, but also on the grain size evolution. Among the strengthening mechanisms, an initial geometric reorganization of CaCO3 particles has been identified by rheological measurements; followed by the formation of an interconnected network of calcite crystals that increases in strength as the crystals grow and form bridges among them. All compositions yield microporous calcite structures with diverse transformation history, crystal bridging efficiency, and hence final mechanical properties.

Subject Areas

calcium carbonate cement; setting reaction; (re)crystallization kinetics; cement strengthening; crystal bridging

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