CiviLab 2027 · Soil tests

CBR test

The CBR test is used to determine the bearing capacity of a given soil by comparing it with that of a standard soil from the state of California, USA. The general principle is to measure the forces required to drive a cylindrical plunger at a constant rate into a specimen of material. The two forces causing two conventional penetrations are compared with the forces observed on a reference material for the same penetrations.

With our soil software "CiviLab", you can easily perform the calculations for this test, plot the various curves and archive the test reports properly. CiviLab also produces high-quality reports and archives them properly


CiviLab allows you to:

  • Perform the calculations according to the standards:
    • ASTM D1883-99;
    • AASHTO T 193;
    • VTM-8;
    • NF P 94-078;
    • BS 1377-9:1990;
    • NA 5252.
  • Plot the curves using one of the methods;
    • Linear;
    • Cubic spline;
    • Akima cubic spline;
    • Pchip cubic spline;
    • B-spline.
  • Plot the load-penetration curve;
  • Plot the CBR index vs. water content curve;
  • Plot the CBR index vs. unit weight curve;
  • Save and print the results properly;

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