New approach for the measurement of gas permeability and porosity accessible to gas in vacuum and under pressure

This study proposes new approaches for measuring the gas permeability and the accessible porosity of porous media. Two techniques are used: the usual permeameter, of the Cembureau type (measurement under pressure), and a new technique named a “double-cell” permeameter, based on a vacuum technique. T...

Full description

Saved in:
Bibliographic Details
Published inCement & concrete composites Vol. 103; pp. 59 - 70
Main Authors Sogbossi, Hognon, Verdier, Jérôme, Multon, Stéphane
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2019
Elsevier
Subjects
Civil Engineering
Engineering Sciences
Knudsen flow
Laminar flow
Permeability
Porosity
Transfer
Vacuum
Transfer
Vacuum
Permeability
Porosity
Laminar flow
Knudsen flow
knudsen flow
laminar flow
transfer
vacuum
porosity
permeability
Online AccessGet full text

Cover

More Information
Summary:This study proposes new approaches for measuring the gas permeability and the accessible porosity of porous media. Two techniques are used: the usual permeameter, of the Cembureau type (measurement under pressure), and a new technique named a “double-cell” permeameter, based on a vacuum technique. Theoretical and experimental results point out that the apparent permeability measured in vacuum is proportional to the permeability measured under pressure. For a given pressure, the theoretical expression of the coefficients of proportionality leads to a quasi-constant value for a very large range of concrete permeability. A new equation is also proposed to evaluate the accessible porosity from the Time to Reach Steady State (TRSS) recorded during permeability tests. Concordance between the porosity accessible to gas obtained in this way and the porosity measured by the usual technique of hydrostatic weighing is discussed.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2019.04.032