Affiliation:
1. University of Aberdeen
Abstract
A model for the CaO—SiO2—H2O system at 25°C is proposed, and based upon this, more complex systems including the effect of SO42-, Cl-, CO32-, Na+ and K+ on phase relations and solubilities in the title system have been calculated by thermodynamic modelling. At sea-water concentrations of NaCl, mixed sea-water-pore fluid compositions enhance the solubility of calcium from Ca(OH)2 and C-S-H but do not otherwise affect the stabilities of these phases. Carbonate and sulfate, on the other hand, react strongly with cement substances both with and without sodium being present; the complex solubility and reaction paths are quantified. Comparison of calculated reactions with literature data are made where possible; generally good agreement is obtained.
Subject
General Materials Science,Building and Construction