Abstract
The report concerns a method of measuring the apparent air permeability in cover concrete and the effects of air flow geometry, cracks and concrete moisture conditions. The method involved pressurizing a 20 mm diameter cavity cut 35 mm deep into the concrete and measuring the rate of pressure decay. A positive testing pressure coupled with the application of liquid soap solution permitted direct observation of air permeation as bubbles. The depth of the cavity was a critical factor and it was desirable to locate the cavity so that its centre-line was at least 40 mm from the nearest lateral surface. Cracks in the concrete increased the permeability and the variability of results. Pore water restricted air permeation through the cover concrete. Moisture conditions were conveniently monitored using a relative humidity probe in the cavity and by measuring weight losses during drying and wetting.
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