DEVELOPMENT OF PORE-SCALE MODEL FOR INGRESS OF CO2 BRINE THROUGH CEMENT PASTE

Author(s): Ravi A. Patel (1), Nikolaos I. Prasianakis (1)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 665-670
Total Pages: 6
Language : English

Abstract: Carbonation of cementitious materials is of relevance for a wide range of practical applications. It leads to dissolution of calcium bearing phases in cementitious materials and subsequent precipitation of calcite. This process alters the properties of the material itself. The progression of carbonation and its effect on the microstructure of cementitious materials depends on a variety of parameters. Therefore, a pore-scale modelling approach capable of capturing changes in microstructure under external boundary conditions, can be a useful tool in developing mechanistic understanding. With this aim, a pore-scale modelling approach is presented for carbonation under saturated conditions, and is applied to a stylized pore structure consisting solely of portlandite and open pores. Evolution of this pore structure under different boundary conditions is investigated. Preliminary simulations illustrate that the model is able to capture qualitatively the main trends that are reported in the literature. These simulations also effectively demonstrate that a very small volume fraction of precipitating mineral can have a large effect on transport pathways, inhibiting or slowing down the dissolution.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00