Numerical simulation of air permeability in covercrete assuming molecular flow in circular tubes

•The surface air permeability test was numerically simulated assuming molecular flow.•The numerically obtained air permeability agreed well with the theoretical one.•The relationships between air permeability, pore radius and pore volume were summarised. Torrent’s testing method is extensively used...

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Bibliographic Details
Published inConstruction & building materials Vol. 125; pp. 784 - 789
Main Authors Sakai, Yuya, Kishi, Toshiharu
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 30.10.2016
Elsevier B.V
Subjects
Analysis
Concrete
Mechanical properties
Molecular flow
Non-destructive testing
Numerical simulation
Permeability
Porosity
Surface air permeability
Japan
Surface air permeability
Molecular flow
Numerical simulation
Concrete
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Summary:•The surface air permeability test was numerically simulated assuming molecular flow.•The numerically obtained air permeability agreed well with the theoretical one.•The relationships between air permeability, pore radius and pore volume were summarised. Torrent’s testing method is extensively used for measuring the surface air permeability of concrete. However, the equation for the coefficient of surface air permeability adopted in the test has not been well validated. We numerically simulated the surface air permeability test assuming molecular flow in different number of circular tubes of different radii. Our numerically obtained coefficients agreed well with the theoretical one and also with Torrent’s coefficients of surface air permeability when the correct porosity was input. The relationships between the surface air permeability, pore (tube) radius, and porosity (effective area) were summarised.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2016.08.105