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Introduction
-The Torvane shear device (ELE International model 26-2261; Figure 13) enables the user to quickly determine the shear strength of cohesive soils.
Three sizes of vanes are supplied with torvane. The standard vane has a stress from 0 to 1 kg/cm2, this is also the approximate range of torque that can be easily applied by finger pressure.
It is used for fully saturated cohesive soils with undrained strength independent of normal pressure. The stress range permits it to be used for clays varying in consistency from very soft to stiff. A large vane is provided for use with remolded samples, and has a ratio of 0.2. A smaller vane with a ratio of 2.5 is used with stiffer clays
-The pocket penetrometer was develop by Soiltest Inc. for use for field engineers to check the visual classification of soils. The readings of the penetrometer were compiled from several thousand unconfined compression tests of silty and clay-like soils
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