Pavement Dynamic Cone Penetrometer (DCP) – Model TO-567

The Pavement Dynamic Cone Penetrometer (DCP) from Tinius Olsen is a highly robust instrument, designed for fast in-situ assessment of strength of sub-grade and the bases for roads and runway pavements. Nonstop measurements can be made down to a depth of 800 mm or, when an extension is fitted, to a depth of 1200 mm. In cases where pavement layers have varying strengths, the boundaries can be identified and the thickness of the layers established.

A standard test just takes a few minutes, so this instrument provides a highly efficient technique of attaining information that would usually require test-pits. Correlations have been determined between measurements with DCP and California Bearing Ratio (CBR) so that the results can be inferred and compared with CBR specifications for pavement design. Agreement is usually good over most of the range but variances are obvious at low values of CBR, particularly for fine grained materials.

The design of the pavement DCP is similar to the one illustrated by Kleyn, Maree and Savage (1982) in their paper “The application of the pavement DCP to determine the bearing properties and performance of road pavements”, published in proceedings of International Symposium on Bearing Capacity of Roads and Airfields, Vol.1. (The Norwegian Institute of Technology) and developed by TRRL, UK.

It integrates an 8 kg weight dropping through a height of 575 mm and a 60° cone possessing a diameter of 20 mm. It is supplied whole with assembly tools and weighs about 20 kg.

The DCP requires three operators, one to hold the instrument, another to raise and drop the weight, and a technician to note the results. The instrument is held vertically and the weight cautiously raised to the handle limit and then allowed to fall onto the anvil. This equipment is supplied with top bottom rod, hammer, cone, handle, scale, and anvil with a wooden carrying case.

Key Features

  • Simple and robust instrument for fast in situ measurement of the structural properties of road pavements
  • Portable and can be housed in a carrying case
  • Provides quick and efficient technique of attaining information
  • For continuous measurements up to a depth of 800 mm and 1200 mm with the extension rod

Supplied as Standard

  • TO-56701 Top and bottom rod
  • TO-56706 Anvil
  • TO-56704 Scale
  • TO-56702 Handle
  • TO-56705 Cone 60°
  • TO-56703 Hammer

Optional Accessories

  • TO-56701 Top and bottom rod
  • TO-56704 Scale
  • TO-56705 Cone 60°
  • TO-56706 Anvil
  • TO-56702 Handle
  • TO-56703 Hammer
  • TO-56707 Bottom rod

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