An Alternative Procedure for the Analysis of Data from the Cup Method Measurements for Determination of Water Vapor Transmission Properties

Petersen, DR; Link, RE; Kumaran, M.K.

doi:10.1520/jte12115j

Cited by 20 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other deficiencies lie in practical issues that have often been noted, for example in [6,11]. Here we discuss two other matters which have not been considered in earlier publications.…”

Section: Critique Of Test Methodsmentioning

confidence: 95%

“…As noted elsewhere [10][11][12][13], the WVP is not a permeability in the Darcian sense of advection in response to a gradient of total hydraulic pressure, but rather it is a tracer diffusivity. In Fig 1, the mass flux arises from molecular diffusion of dilute water vapour in air, where the air is essentially stationary.…”

Section: Definitions and Theorymentioning

confidence: 91%

“…The data (26 values, some no doubt the mean of replicates) include both wet-cup and drycup measurements made at several different RH conditions. (Other data [11] on an unspecified calcium silicate insulation material of lower bulk density are included only in Fig 8).…”

Section: Other Materialsmentioning

confidence: 99%

“…by an individual laboratory at several RH values on a single material. Notable examples are reported in [11,38,39], from which two datasets are shown in…”

Section: Dependence Of Resistance Factor On Humiditymentioning

confidence: 99%

See 3 more Smart Citations

Water-vapour permeability of inorganic construction materials

Hamilton

2023

Preprint

View full text Add to dashboard Cite

Water-vapour permeability (WVP) data on brick, stone, plaster and cement-based materials from some some seventy publications are reviewed and assessed. Almost all sources use standard cup-test methods or close variants. Comparisons of WVP values from different sources on similar materials confirm that reproducibility between different laboratories is poor. Some deficiencies of cup-test methods are discussed, including uncertainties arising from the use of saturated-salt humidistats and desiccants. There is some evidence that the water-vapour resistance factor decreases with increasing mean relative humidity across the test specimen; and weak evidence that the resistance factor increases with volume-fraction porosity. The contribution of liquid film flow to the measured permeability is discussed. It is concluded that (1) available data are inadequate to establish the fundamental physics of WVP; (2) vapouronly permeability data for engineering purposes should be obtained in dry-cup tests at low humidity; and (3) research studies should aim to integrate the WVP into the framework of unsaturated flow theory.

show abstract

“…Other deficiencies lie in practical issues that have often been noted, for example in [6,11]. Here we discuss two other matters which have not been considered in earlier publications.…”

Section: Critique Of Test Methodsmentioning

confidence: 95%

Section: Definitions and Theorymentioning

confidence: 91%

Section: Other Materialsmentioning

confidence: 99%

“…by an individual laboratory at several RH values on a single material. Notable examples are reported in [11,38,39], from which two datasets are shown in…”

Section: Dependence Of Resistance Factor On Humiditymentioning

confidence: 99%

See 2 more Smart Citations