Coefficient of pneumatic permeability
This test method covers the laboratory determination of the coefficient of permeability for the flow of air (pneumatic permeability) through partially saturated porous materials. This test method may be used with undisturbed or compacted coarse grained soils, silts, or lean cohesive soils that have a low degree of saturation and that have pneumatic permeability between 0.001 square micrometer (1.01 millidarcy) and 100 square micrometre (101 darcy).
Right circular cylinder, with diameter of at least 51 mm (2.0 in) and a length to diameter ratio of 1.3 or greater. Also greater than 6 times the largest grain size particle.
airflow, flexible wall permeameter, permeability, permeameter, pneumatic permeability, rigid wall permeameter