Editing Building stones of Edinburgh: tests and properties

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The porosity is obtained by filling the pores with a non-reactive fluid. The latter is achieved usually by filling the pores with distilled water under vacuum. This method depends upon the assumption that the pores are interconnected and that all can be filled by a liquid from the outside of the sample. This is usually the case with building sandstones but strictly speaking this yields the 'apparent porosity'. The 'true porosity' can be derived by calculation from the mass density of the solid material and the bulk density of the stone.
 
The porosity is obtained by filling the pores with a non-reactive fluid. The latter is achieved usually by filling the pores with distilled water under vacuum. This method depends upon the assumption that the pores are interconnected and that all can be filled by a liquid from the outside of the sample. This is usually the case with building sandstones but strictly speaking this yields the 'apparent porosity'. The 'true porosity' can be derived by calculation from the mass density of the solid material and the bulk density of the stone.
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The relationship between the volume of fluid absorbed and the vacuum applied gives an indication of the pore-size distribution.
 
The relationship between the volume of fluid absorbed and the vacuum applied gives an indication of the pore-size distribution.

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