For the assessment of the long-term behavior of cement stabilized and municipal solid waste incinerator products, an understanding of the degradation of calcium silicate hydrates is needed. The series CSH- tobermorite- xonotlite were chosen to determine the relationship between ageing crystallinity and stability. Initial dissolution experiments were conducted with xonotlite in a through-flow reactor. The dissolution rates were calculated and interpreted in terms of surface complex theory. The dissolution rates of xonotlite in the pH range 9-11 were found to range 25 µmol.g-1 . h-1 - 3.5 µmol.g-1 .h-1 . The rates were compared to those of naturally occurring minerals. They appear to be faster than those of aluminosilicates but slower than calcite. Supporting evidence from field studies suggest that CSH dissolution could be controlled either by kinetic or thermodynamic factors in a field situation depending on the hydrology of the system.
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