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California Bearing Ratio (CBR) Test System

What is the California Bearing Ratio test?

California Bearing Ratio (CBR) Data Sheet
Sample Geotechnical Report

LoadTrac II

The California Bearing Ratio (CBR) test is used in evalutating subgrade, subbase and base materials as an aid to the design of pavements. The laboratory test uses a circular piston to penetrate material compacted in a mold at a constant rate of penetration. The CBR is expressed as the ratio of the unit load on the piston required to penetrate 0.1 in. (2.5mm) and 0.2 in. (5.1 mm) of the test material to the unit load required to penetrate a standard material of well-graded crushed stone.

Applicable Test Standards

  • ASTM D1883
  • AASHTO T 193
  • BS 1377-4
  • AS 1289


  • Choose capacity to fit user needs from 45 kN (10,000 lbs.) to 90 kN (20,000 lbs.) models
  • Total automation, control, data collection and reporting of test results
  • Prepare tables and plots of report quality within minutes of completing a test.
  • Geo-NET compatibility lets unit be accessed and controlled over a computer network
  • Generate columns of data for easy reduction using your own spreadsheet software


  • Capacity: 45 kN (10,000 lbs) or 90 kN (20,000 lbs)
  • Rate of displacement: 0.00003 to 25 mm/min (0.000001 to 1.0 in/min)
  • Platen travel: 76 mm (3.0 in)
  • Dimensions: 464 x 546 x 1206 mm (18 x 21.5 x 47.5 in)
  • Weight: 55 kg (120 lbs)

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