![]() ![]() Below a critical stress referred to as the yield stress, the system responds like an elastic solid while above this critical stress, it flows like a liquid. 3,8 For pure calcite gels, large solid fraction and/or attraction between calcite particles result in the formation of a gel whose mechanical response depends on the applied stress. 2 Calcium carbonate has been used for thousands of years as construction material, and more recently as a raw material in the chemical industry and as filler in pharmaceutical, paper or cement industries.Īdding calcite to water leads to the formation of colloidal gels which are often used to mimic early age cementitious materials, 3–6 whose mechanical properties depend on the calcite solid fraction, the interparticle forces and the addition of superplasticizers 4,5,7 or of specific ions. 1 It is found in rocks like limestone, chalk or marble, and is one of the largest carbon repositories. 1 Introduction Calcium carbonate, including its most stable polymorph, calcite, is one of the most abundant minerals on Earth. We unveil, for the first time in a colloidal gel, a direct connection between attractive interactions and the occurrence of shear bands, as well as stress fluctuations. We couple rheometry and ultrasonic velocimetry to study experimentally the flow behavior of gels of colloidal calcite particles dispersed in water, while tuning the strength of the interparticle attraction through physico-chemistry.
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