Sulphate crystallization modelling and surface reactivity in solution. (15th December 2017)

• Record Type: Journal Article
• Authors: Georgin, J.F.; Maach, N.; Pommay, J.
• Is Part Of: Construction & building materials. Volume 156(2017)
• Page Start: 266
• Page End: 276
• Publication Date: 2017-12-15
• Subjects: Plaster -- Dissolution -- Precipitation -- Crystallization pressure -- Surface reactivity -- Modelling; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.08.155
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Hydratation modelling of plaster in solution. Crystallization pressure is considered in precipitation mechanism. Concept of chemical activity versus particles size is raised. Reactive surface is taking into account in the solid/liquid chemical reaction. Abstract: The hydration of mineral phases corresponds to dissolution – precipitation mechanisms. A model considering crystallization pressure and particle size distribution of both anhydrous and precipitate sulphate is proposed. The model is applied in the case of β-plaster hydration in a solute. Numerical results demonstrate that the hydration process can be viewed as the sequence of nucleation, high growth regime and decreasing growth regime. Modifications in the particle size distribution and reactivity surface are characteristic of each phase.