The Measurement of the moisture transfer properties of paint films using the cup method

The cup method has been used to measure the diffusion coefficient (or permeability) of water in free paint films. A dependence on the layer thickness of the diffusion coefficient could not be measured. The diffusion coefficient depends strongly on the relative humidity. The measured diffusion coefficient is found to be smaller than the measurement results from the literature on non-free paint films

Diffusive transport of radon in a homogeneous column of dry sand

To validate a model for radon transport in soil, measurements of diffusive radon transport under well-defined and controlled conditions have been made in a homogeneous column of dry sand with an air-filled volume on top. This volume simulates a crawl space. The measurements concern time-dependent diffusive transport with several different crawl-space heights and steady-state diffusive transport with different crawl-space ventilation rates. This study forms part of an extensive validation which will also cover more complex situations (e.g., advective transport, presence of pore-water). Properties of the sand that are presently being used in the radon transport model were determined from independent measurements. The comparison between model calculations and experimental results showed a good correspondence with maximum deviations of less that 10%

Diffusive transport of radon in a homogeneous column of dry sand

To validate a model for radon transport in soil, measurements of diffusive radon transport under well-defined and controlled conditions have been made in a homogeneous column of dry sand with an air-filled volume on top. This volume simulates a crawl space. The measurements concern time-dependent diffusive transport with several different crawl-space heights and steady-state diffusive transport with different crawl-space ventilation rates. This study forms part of an extensive validation which will also cover more complex situations (e.g., advective transport, presence of pore-water). Properties of the sand that are presently being used in the radon transport model were determined from independent measurements. The comparison between model calculations and experimental results showed a good correspondence with maximum deviations of less that 10%

Moisture transport in coated plaster

n the framework of the research project: 'Water balance of water-borne paint systems on plaster substrates in relation to fungal growth', a study is carried out to moisture transport mechanisms in coated gypsum plaster. In this contribution, the set-up of the study is described. Besides a description of the experiments to investigate the moisture transport properties of the plaster, coating and coated plaster, attention is given to the effect of slight alterations of the paint formulation on the moisture transport characteristics of the final pain