Numerical Modeling of Salt Transport and Precipitation in Non-Isothermal Partially Saturated Porous Media Considering Kinetics of Salt Phase Changes |
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Authors: | Marcin Koniorczyk Dariusz Gawin |
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Institution: | (1) Civil and Environmental Engineering, Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ 08544, USA |
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Abstract: | Water and salts strongly influence the durability of porous materials. One of the most adverse phenomena which is related
to the salt and moisture presence in the pore system of building materials is salt crystallization. The process is associated
with the supersaturation ratio. The salt phase change kinetics is taken into account during the modeling of coupled moisture,
salt, and heat transport. To solve the set of governing, differential equations the finite element and the finite difference
methods are used. Three different rate laws are assumed in modeling the salt phase change. The drying, cooling, and warming
of the cement mortar sample, during which the salt phase change occurs, 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 presented and discussed. The results obtained in the numerical simulation assuming the first, second, and fourth order
rate low indicate that the higher order of the rate law the longer time delay between the change of boundary conditions and
the salt precipitation. Such an analysis might be very useful during the determination of the material parameters by solving
the inverse problem. |
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Keywords: | |
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