Beta-dicalcium silicate dissolution data by digital holographic microscopy

These data are supplemental data that include digital holographic microscopy
measurements of nanoscale surface topography changes occurring during the dissolution of
beta-dicalcium silicate in water and in water-ethanol mixtures. The dissolution flux in
flowing solutions depends on the water activity to an empirically determined power of
1.7. The heterogeneous distribution of reactive surface sites (e.g., crystalline
defects) at the surface leads to a distribution of local fluxes. Accounting for the
nominally non-reactive and slowly reactive surface sites, the median of the macroscopic
dissolution flux distribution is -0.64 umol m-2 s-1. Ex situ X-ray photoelectron
spectroscopy indicates that the calcium-to-silicon ratio near the surface decreases by
about 10 % after dissolution has taken place for more than 30 minutes.