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Aqueous CaCO3 dispersions as reference systems for early-age cementitious materials by Nikola Mikanovic; Kamal Khayat; Monique Pagé; Carmel Jolicoeur is a Materials Science article available to read on EtoBox.

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Cementitious materials are derived from complex colloidal systems in which different minerals react with water to form a variety of hydration products. Moreover, chemical additives are often incorporated in these systems to optimize the behaviour of the fresh slurries, and ultimately, the physical properties of the hardened material. Hence, the solution and interfacial phenomena, which determine the behaviour of cementitious systems, are inherently very complex. In principle, comparative studies on dispersions of portland cement and appropriate 'inert' minerals should help the identification and understanding of processes specific to reactive cementitious components. To this effect, several highly insoluble minerals were selected including TiO 2 , Al 2 O 3 , SiO 2 , Mg(OH) 2 and CaCO 3 . The state of flocculation of these materials in dilute and concentrated slurries was examined through sedimentation and rheological measurements under various conditions, and the results compared to observations on similar slurries containing cement. The comparison showed that calcium carbonate (CaCO 3 ) exhibits surface and colloidal properties very similar to cement particles at early stages of h

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Author

Nikola Mikanovic; Kamal Khayat; Monique Pagé; Carmel Jolicoeur

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)