Experimental Assessment of Moisture Storage Functions of Different Types of Sandstone
In this paper, sandstones from particular quarries are studied using pressure plate method and a water vapour adsorption device. Firstly, basic material properties are examined. Moisture storage parameters for hygroscopic and over-hygroscopic moisture transport are determined using desorption isotherms and water retention curves. Using Kelvin equation, the combined desorption isotherms and retention curves are presented in a full range of relative humidity (0 – 100 %). Resulting combined isotherms of tested sandstones show the tendency of moisture storage properties in relation to the porosity of the materials. The measured data gives the information on material desorption capacity when exposed to the water vapour pressure.