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CBR & Plate Load Tests

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CBR & Plate Load Tests

The Californian Bearing Ratio (CBR) is a well-established scale for assessing the relative state of compaction of different road bases. There are a number of different tests that can assess the CBR value of different materials.
The principal tests we offer are:

  • In-situ testing using truck mounted apparatus in accordance with BS1377: Part 9: 1990
  • In-situ testing using a TRL Dynamic Cone Penetrometer (DCP)
  • Laboratory CBR testing in accordance with BS1377: Part 4: 1990)

The truck mounted apparatus is considered the most reliable method, but is more expensive and usually charged on a day-rate. A DCP is indicative and only reliable in finer grained soils, but has the benefit of providing a results profile with depth to 950mm and is more cost effective. A laboratory CBR test can be charged per sample, and can be done at different moisture contents, but it is ex-situ and the sample is recompacted in the lab which may differ from the field conditions.

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Plate Load Test (or Plate Bearing Test) measures load-settlement data for soils in-situ. That data can be processed to obtain a CBR value for pavements, determine settlement parameters for foundations in granular soil, or estimate the shear strength of cohesive soils.

 

We offer one form of the test:

  • Plate Load Test to BS1377: Part 9: 1990

Things to consider:

  • The test is useful in that it tests a volume of material rather than a point.
  • Care is needed to interpret the results where the size of plate needs to be such that a sufficient depth of soil is tested
  • This is especially the case in foundation design and verification, where the results need to be scaled-up reliably to the size of the foundation
  • The test also requires a suitable Kentledge, such as a 10-ton tipper truck or tracked excavator, which can pose access issues

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