Numerical analysis of salt crystallization in non-isothermal moist porous materials

Author(s): Dariusz Gawin, Marcin Koniorczyk, Piotr Konca, Witold Grymin
Paper category: Proceedings
Book title: Proceedings on International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Moisture in Materials and Structures
Editor(s): Kurt Kielsgaard Hansen, Carsten Rode and Lars-Olof Nilsson
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 82-89
Total Pages: 9
Language : English

Abstract: Water and salt are important factors influencing porous materials durability, therefore a lot of experimental and theoretical studies are devoted to them. Salt and moisture presence in the material pore system might result in salt crystallization. This may deteriorate a building structure due to efflorescence of salt on its surface and an additional tensile stress, which is produced during the crystallization. The experimental study was performed in order to determine the influence of crystallization of three different salts on the cement mortar microstructure. The mathematical model of salt, moisture and energy transport was developed and based on it the computer code was developed. The kinetics of salt crystallization is taken into account while modelling. The drying and cooling-warming of cement mortar containing salt solution, have been simulated using the developed software. The changes of salt concentration in the pore solution and the amount of precipitated salt due to variation of boundary conditions are analysed. The crystallizing salt generates the additional tensile stress in the surface layer, what might be responsible for its deterioration and spalling.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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