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Monocalcium aluminate
Monocalcium aluminate (CaAl2O4) is one of the series of calcium aluminates[1]. It does not occur in nature, but is important in the composition of calcium aluminate cements. Additional recommended knowledgePropertiesMonocalcium aluminate is formed when the appropriate proportions of calcium carbonate and aluminium oxide are heated together until the mixture melts. It melts incongruently at 1390°C. The crystal is monoclinic and pseudohexagonal, and has density 2945 kg.m-3. In calcium aluminate cements, it exists as a solid solution in which the amount of minor elements depends upon the bulk composition of the cement. A typical composition[2] is Ca0.93Al1.94Fe0.11Si0.02O4. It reacts rapidly with water, forming the metastable hydrate CaO.Al2O3.10H2O, or a mixture of 2CaO.Al2O3.8H2O, 3CaO.Al2O3.6H2O and Al(OH)3 gel. These reactions form the first stage of strength development in calcium aluminate cements. References
Categories: Cement | Calcium compounds | Aluminates |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Monocalcium_aluminate". A list of authors is available in Wikipedia. |