Gas-Permeability of Concrete In Situ: Theory and Practice


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Title: Gas-Permeability of Concrete In Situ: Theory and Practice

Author(s): Anker Jon Hansen, Niels Saabye Ottosen, and Claus Germann Petersen

Publication: Special Publication

Volume: 82


Appears on pages(s): 543-556

Keywords: air; concretes; gases; nondestructive tests; permeability.

Date: 9/1/1984

able and First, the main test susqested appplies low air pressure to ease over time for a siven depth as a measure of the air-permeability. And hre .40, compressive strength respectively 10 MPa (1450 psi) , 26 MPa (3770 psi), and 86 MPa (12500 psi) all types of concretes having 90% The paper describes methods, theory, and port apparatus for estimating gas-permeability of concrete in situ, the users’ preliminary field experiences.the surface of the concrete, and monitors the pressure incr We present a theory of induced transient air flow in concrete substantiate the theory by laboratory measurements in qualities of concrete ( w/c-ratios 1.00, 0.55 and 0 relative humidity). We also outline field experience with The relative humidity must be monitored and, if nee corrected for. Second, other types of in-situ test applications of reveal other properties, including microcracks and porositie the outer surface layer, resistance to carbonation of concreting for a depth of down to 50 mm. The ded,gas s in the reinforcement cover, and bleeding below aggregates during