Modelling the incongruent dissolution

Hi all,

I'm trying to simulate CSH(Ca-Si-H2O) dissolution, which is usually considered as an incongruent solubility behavior. I'm thinking how to simulate the reaction of CSH with high Ca/Si ratio converting to low ratio with Toughreact.

e.g.   CSH:1.7 →CSH:1.2→CSH:0.8 (In this process, CSH is losing Calcium ions.)

Is it possible in Toughreact?

Thanks!