CBR Test



The California Bearing Ratio (CBR) is a degree of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The CBR is the ratio of the bearing load that penetrates a material to a specific depth compared with the load giving the same penetration into crushed stone. Penetration is measured by applying the bearing load on the sample using a standard plunger of diameter 50 mm at the rate of 1.25 mm/min. The CBR is expressed as a percentage of the actual load causing the penetrations of 2.5 mm or 5.0 mm to the standard loads on crushed stone. A load penetration curve is drawn. The load values on standard crushed stones are 1,370 kgf (13.44 kN) and 2,055 kgf (20.15 kN) at 2.5 mm and 5.0 mm penetrations respectively

With "CiviLab", you can easily do the calculations for this test, plot the various curves and correctly archive them. CiviLab also provides high quality reports.

In the CBR test you can use CiviLab to:

  • Perform the calculations according to the standards:
    • ASTM D1883-99;
    • AASHTO T 193;
    • VTM-8;
    • NF P 94-078;
    • NM 13.1.128.
  • Draw the stress (or loads) -penetration curve ;
  • Draw the CBR index-Water content curve;
  • Draw the CBR index-density curve ;
  • Save and print results appropriately;
User manual: CBR test


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What is CiviLab ?



CiviLab is a civil engineering laboratory software (Soil and concrete). Our laboratory software allows you to perform the tests with your preferred language and provides you a multilingual reports. Designed by civil engineers to meet your expectations. Easiness of usage, allowing members of your laboratory to master CiviLab in record time.

Our soil and concrete laboratory software supports the following languages

  • English;
  • French.

CiviLab supports the following unit systems:

  • Metric;
  • Imperial.

CiviLab manages the following tests and calculations:


  1. Geometric properties (density, Moisture content, Void ratio ...etc.);
  2. Grain size distribution test;
  3. Atterberg limits test;
  4. Sand equivalent test;
  5. Micro deval abrasion test;
  6. Los angeles abrasion test;
  7. Proctor compaction test;
  8. CBR test;
  9. Direct shear test;
  10. Oedometer test;
  11. Drill hole log;
  12. Heavy dynamic penetrometer test;
  13. Cone penetration test;
  14. Menard pressuremeter test;
  15. Concrete mix design- ACI method;
  16. Concrete mix design- Dreux- Gorisse method;
  17. Concrete mix design- Bolomey method;
  18. Concrete mix design- Faury method;
  19. Compression test on concrete;
  20. Ultrasonic testing;
  21. Bitumen Extraction test;
  22. Bulk relative density of bituminous specimen;
  23. In-Situ Density Measurements.
  24. Shallow foundations:
    • Evaluation of bearing capacity from: laboratory tests, dynamic penetrometer test, cone penetration test and Menard pressuremeter test;
    • Settlement evaluation from the pressuremeter test.

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