Water permeability of cementitious materials: outstanding issues on measurement and modelling approaches

Author(s): Quoc Tri Phung, Ravi A. Patel, Norbert Maes, Diederik Jacques
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 2
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 521-526
Total Pages: 6
Language : English

Abstract: Permeability is a fundamental material property for characterizing concrete durability as it determines the penetration of aggressive substances responsible for degradation under a pressure gradient. However, measuring permeability of cementitious materials is not a trivial task as is discussed in this work by an extended review of both direct and indirect permeability measurement methods. The main challenges are to cope with the continuous change in microstructure as a result of hydration of early age cementitious materials; to ensure the completely saturated state of samples; and to increase the accuracy of extremely slow flow measurement. These challenges result in a very scattered permeability measured by different techniques, and in many cases the difference can be up to two orders of magnitude. Similarly, while recent advances of computer power has allowed for computing permeability from digitized images or virtual microstructures generated from microstructure and cement hydration models, the question remains on whether the resolution of images is appropriate or whether the virtual microstructures are representative. The validation of permeability predictions from microstructures is still an issue.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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