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Water vapour and liquid permeability measurements in concrete

Abstract This chapter shows how water permeability may be calculated from measurements of drying under a vacuum. The results obtained are for water vapour transport at low pressures, and gas slippage theory is then used to compare them with liquid water permeability measurements on samples of the same mixes. The experimental work includes the drying procedure and also the ISAT and the high pressure test for direct permeability measurements. The results from all of these tests are compared and additional gas and liquid permeability data from Chapter 5 are included for comparison. It is concluded that, with appropriate analysis, all of the procedures give comparable values for intrinsic permeability.