Discussion
Which one of the following statements is NOT appropriate regarding cone index
Answer: C
The statement that is not appropriate is It is dimensionless.
Cone index is the force needed to push a standard cone penetrometer into the soil divided by the area of the cone's base. It is therefore a pressure, reported in kPa or MPa, and has dimensions of force per unit area.
The other statements are accepted. Cone index is used as an index of soil strength for trafficability and tillage work. It is a composite parameter, because the penetration resistance mixes shear, compression and soil-metal friction rather than measuring one soil property. The ASAE standard penetrometer is pushed at a constant rate of about 30 mm/s (1829 mm/min).
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