morecoffeeplz:
From the ACI website:
Q. How is the permeability of concrete determined?
A. With difficulty and usually indirectly, indications of the permeability of concrete are determined by air and water permeability tests (ACI 228.2R); or by the ponding test (ASTM C1543); or by the rapid chloride penetration test (ASTM C1202).
Regards,
DB