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The measurement of the intrinsic permeability of concrete is described. The tests developed are rapid and reliable. It is shown that the intrinsic permeability of concrete can be characterised using the air permeability test. Hydraulic permeability data can also be derived if required. The permeability of concrete in the surface layer (that comprising the cover to reinforcement) is greatly affected by both the water/cement ratio and curing. Concrete quality should not be estimated from strength data alone.

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