A cone penetrometer is an instrument used to perform a cone penetrometer test (CTP), from which preliminarily geotechnical engineering properties of soils, such as the soil strength, can be evaluated, and the delineation of soil horizons can be interpreted (ASTM D3441 2005; ASTM D5778 2000). There are different types of cone penetrometers, including mechanical, mechanical friction, electrical friction, and piezocone penetrometers. Mechanical cone penetrometers are known for their low cost and easy operation, where as the electrical cone and piezocone penetrometers can potentially extend the range of soil engineering property measurements (NRCS 2012).
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