Abstract
Modeling the solubility behavior of calcium silicate hydrate (C-S-H) gel is important to make quantitative predictions of the degradation of hydrated ordinary Portland cement (OPC) based materials. Experimental C-S-H gel solubility data have been compiled from the literature, critically evaluated and supplemented with new data from the current study for molar Ca/Si ratios=0.2-0.83. All these data have been used to derive a discrete solid phase (DSP) type C-S-H gel solubility model based on two binary non-ideal solid solutions in aqueous solution (SSAS). Features of the DSP type C-S-H gel solubility model include satisfactory predictions of pH values and Ca and Si concentrations for all molar Ca/Si ratios=2.7→0 in the C-S-H system, portlandite (CH) for Ca/Si ratios>1.65, congruent dissolution at Ca/Si ratios=0.85, and amorphous silica (SiO2(am)) for Ca/Si ratios<0.55 as identified in the current study by IR spectroscopy.
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