engleski

Modeling of Solid Fraction Evolution During Calcium Aluminate Cement Hydration

Calcium aluminate cement (CAC) is a special cement advantageously employed with high performance in many specific applications. Knowledge of the hydration reactions and microstructure evolution is important from the viewpoint of safe usage, good durability and functionality. The hydration of CAC is highly temperature dependent, yielding different hydration products that alter material properties. During the setting and hardening, microstructure of material and amounts of certain phases are changing. The solid fraction comprises the formed hydration products and the fraction of non-reacted cement. This paper presents a study of the solid volume evolution during early age hydration of CAC. The hydration of specimens of commercial iron-rich CAC (Istra 40) has been investigated by thermo-gravimetric analysis, density measurements and powder X-ray diffraction (XRD). Mathematical model of the solid volume evolution based on the main reaction scheme of the principal mineral hydration is presented. The model predictions are compared to the experimental results.

calcium aluminate cement; hydration; mathematical modeling.

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