Abstract
The moisture storage parameters of three different building materials: calcium silicate, ceramic brick and autoclaved aerated concrete, are determined in the hygroscopic range and overhygroscopic range. Measured sorption isotherms and moisture retention curves are then combined into moisture storage functions using the Kelvin equation. A comparison of measured results with global characteristics of the pore space obtained by mercury intrusion porosimetry shows a reasonable agreement; the median pore radii by volume are well within the interval given by the beginning and the end of the characteristic steep parts of the moisture retention curves.
Highlights
Application of mathematical and computational models to simulate transporr processes in building materials requires knowledge of the material parameters that are used as input parameters of the models
Storage parameters need to be defined because transport equations are generally formulated for particular mass and energy densities, and in their original form they do nor contain the basic state variables that appear in the constitutive equations
The main role of storage parameters is that they make it possible to calculate the partial derivatives of the particular mass or energy densities with respect to the basic state variables
Summary
Application of mathematical and computational models to simulate transporr processes in building materials requires knowledge of the material parameters that are used as input parameters of the models. Storage parameters need to be defined because transport equations are generally formulated for particular mass and energy densities, and in their original form they do nor contain the basic state variables that appear (in the form of their gradients) in the constitutive equations. The sorption (or desorption) isotherm is the main parameter used in most models, while in the overhygroscopic range, the moisture retention curve is employed. These nvo moisture storage parameters can be combined in a single relation, the moisture storage function, using the Kelvin equation (see, e.g., [] for more details)
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