Determination of the moisture storage characteristics of porous capillary active materials

Abstract

A B S T R A C T R i~ S U M i~With new improved calculation models a good agreement between computed and measured results of moisture transfer is obtainable on condition that correct material properties are used. Especially when capillary active materials are in hygric connection, their moisture storage characteristics have a predominant influence on the moisture behaviour of the building component. In this contribution, a pressure plate method to determine the moisture storage characteristics in the capillary moisture region is presented, which uses water as a measuring medium and thus assures a more realistic description. Furthermore, it is shown how to combine these results with the sorption isotherm, which describes the storage function in the hygroscopic moisture region, to obtain one continuous storage function over the entire moisture region, from dry material up to capillary saturation. De nouveaux modules amdliords pour le cakul du transfert de l'humiditd permettent d'obtenir des rdsultats qui correspondent bien aux rdsultats des essais, ~ condition de choisir correctement les propri~te's des mat&iaux h dtudier. En particulier

Experimental and Simulation Study on Diffusion Behavior of Chloride Ion in Cracking Concrete and Reinforcement Corrosion

“…In this section, based on the numerical model of the uncracked concrete and amendatory chloride migration equation (6), the e ect of relative humidity in concrete on chloride migration is discussed. In general, moisture exists in pores of concrete in gaseous state and liquid state when the relative humidity in concrete is less than 45% and more than 45%, respectively [29]. erefore, chloride migration concentration distribution pro les under 50%, 70%, and 100% relative humidity in concrete are simulated in this study, and the results are shown in Figure 8.…”

Experimental characterization of moisture transport in brick masonry with natural hydraulic lime mortar

“…above 93-95% RH, the sorption isotherms become extremely steep and slight variations in relative humidity result in large changes in moisture content. Thus, the higher part of the moisture storage curve must be completed by other means, namely pressure plate experiments or results derived from mercury porosimetry [41].…”

Drying-induced deformation behaviour of Shirahama sandstone in no loading regime

“…For comparative studies and characterization, equivalent pore sizes obtained from estimated suctions are often compared with MIP results while considering the Washburn's equation (Washburn, 1921) as a conversion tool (Krus and Kießl, 1998;Aung et al, 2001Aung et al, , 2008. Taking this into consideration, the estimated suctions are converted to equivalent pore size.…”