Light percussion sounding apparatus – BRRC information leaflet A25

A significant correlation between test results from a percussion sounding apparatus and the California Bearing Ratio (CBR value) has been established for fine soils ranging from silt to fine sandy soils I (D < 0,2 mm).

In a standardized form this equipment and test method can render invaluable services:

  • when making the preliminary investigation of a site prior to designing a pavement;
  • when checking the quality of works during execution and when accepting earthworks, subbase layers and trench fills;
  • when diagnosing certain deficiencies observed during road condition surveys.
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