A rate equation is developed by which the dissolution rates of multicomponent silicate glasses in diluted aqueous solutions can be calculated as a function of pH, CO, partial pressure, and salinity. Gibbs free energies of hydration are derived by treating the aqueous solution as a diluted system of aqueous species of the various cations in the glass, and by treating the glass as a mixture of the constitutional phases taken from its basic phase diagram.Beside the free energies, the amounts of H+ and OHabsorbed at the glass surface are taken into account as rate determining factors. Calculated dissolution rates of silica, A type., E type, rock, and slag glass fibres agree with experimental values within +30% on a linear scale.
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