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Water vapor diffusion and adsorption in sandstone: effects of rock structure and composition

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Document pages: 7 pages

Abstract: The term "sandstone " is used for various rocks containing quartz clasts, which can be cemented by secondary precipitated quartz or calcite; In addition, the gap between the debris can be filled by the matrix. These facts lead to the existence of a large number of rocks of different properties. Sandstone is used as building material because of its good accessibility and processability. Since most sandstones are porous, water vapor can penetrate the sandstone structure. The water vapor diffusion rate and vapor adsorption isotherm in the range of sandstone types were determined. It is found that the diffusion resistance factor depends on the total porosity of sandstone, but the adsorption behavior is strongly affected by the properties of specific sandstone; Specific Suface area of stone and presence of clay matrix are determining its sorption isotherm. The published data enable estimating (i) diffusion resistance factor of a sandstone via knowledge of its total porosity and (ii) the sorption isotherm via knowledge of the stone’s nature and specific surface area. This approach can significantly reduce the time necessary to acquire vapor-related properties of a sandstone.

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