Simple methods to approximate the liquid transport coefficients describing the absorption and drying
Krus, M. and Holm A.
Symposium Articles
Krus, M. and Holm A.Simple methods to approximate the liquid transport coefficients describing the absorption and drying, Symposium Articles.
| Abstract: |
| 1. INTRODUCTIONFor transient calculations of moisture behaviour with new calculatingmethods, additional parameters are sometimes necessary in order to be able toachieve good correspondence between calculations and measurements. Liquidtransport exercises a particular influence on moisture behaviour. Per unit oftime, it can transport tens of times more water inside materials than diffusion.The correct determination of the transport coefficients for liquid transport isthus of decisive importance. As discussed in [1], a distinction must be madebetween wetting and drying, i.e. these two boundary conditions producedifferent liquid transport coefficients. The determination of these transportcoefficients, which are highly dependent on water content, is made possible bythe measurement of water-content profiles in the building material using anapparatus based on nuclear-magnetic resonance or on radiography [1, 2].Such precise but time-consuming and cost-intensive determination is,however, often not absolutely necessary. For this reason it would be desirableto have procedures permitting good approximations for the liquid transportcoefficients of the wetting and drying processes to be obtained from basichygricparameters already known for most building materials or from simpleadditional experiments. |
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