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Standards
The Torrent method to determine the air-permeability of concrete is standardized in Switzerland SIA 262-1.
The Torrent method measures the air-permeability of covercrete. i.e. the surface layer of the concrete. So it gives an indication of how resistant the concrete is to gaseous contaminants. It is one of the few tests that...
The Torrent method measures the air-permeability of covercrete. i.e. the surface layer of the concrete. So it gives an indication of how resistant the concrete is to gaseous contaminants. It is one of the few tests that can determine how well the concrete has been installed and compacted.
The Swiss standard SIA 262-1 provides a list of acceptable kT values depending on the environmental conditions. The values are based on an extensive study carried out by the Swiss Highway Authorities.
The calculation for the co-efficient of permeability is shown below:
TORRENT Permeability Tester
Calculation Formulas
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