Abstract
The thermodynamical study of the CaO-Al 2O 3-CO 2-H 2O system, applied to the hydration of monocalcium aluminate at ambient temperature, allows to explain both the experimental precipitation of unstable hydrates (C 2AH 8 and C 4ACH 11) and the apparent complexity of conductimetric curves, by the manifestation of supersaturation phenomena. The role of some anhydrous phases (C 12A 7 and CA 2) present in aluminous cements, and particularly their influence on the acceleration or delay in the precipitation process, are also clearly pointed out from the observation of phase diagrams.
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