Published: Jan 1970
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The drive-cylinder method for determining in-place density involves obtaining a relatively undisturbed soil sample by driving a thin-walled cylinder into the soil with a special driving head. Two procedures are described for performing this test, one for testing at the surface or at very shallow depths, usually less than 3 ft (1 m), and one for testing at greater depths.
Engineer of Soils, Geology, and Foundations Highway Research Board, Washington, D. C.
Senior Research Civil Engineer, Air Force Weapons Laboratory, Civil Engineering Branch,/WLCC/, Kirtland AFB, N. Mex.