Influence of Surface Area Variation on the Kinetics of Hydration of Tricalcium Silicate

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Abstract
Tricalcium silicate reacts initially with aqueous solutions according to a rate law that is first order with respect to the mass of the solid. A kinetic investigation of the hydration of tricalcium silicate for fixed solid to solution, w/w, ratio has been conducted using samples of tricalcium silicate of different total surface area to volume ratios. Consideration of the pH independent rate constants indicates that the rate for the initial step in the hydration process is proportional to the surface area of the solid. Subsequent pH independent rate constants in the overall hydration process are surface area independent.

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