An ion interaction model for the determination of chemical equilibria in cement/water systems

✍ Scribed by E.J. Reardon

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 886 KB
• Volume: 20
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(90)90070-e

✦ Synopsis

A chemical equilibria model is proposed for the simulation of reactions between porewater and the various amorphous and crystalline minerals of cementitious material at 25°C. The model utilizes the Pitzer Ion Interaction model as a basis for the calculation of ion activity coefficients. This allows the simulation of chemical equilibria between minerals and water to high solute concentrations. A variable compositional model for CSH based on the data of Gartner and Jennings is also incorporated into the solving relations. An example simulation of the effect of progressive additions of sulfuric acid on a cement paste are presented to illustrate the basic workings of the model.