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The California Bearing Ratio (CBR) is used to evaluate the potential strength of sub-grade, sub-base, and base course material for use in pavements. This test method determines the CBR of pavement materials from laboratory compacted specimens. It is intended for, but not limited to, evaluating the strength of cohesive materials with a maximum particle size of 3/4 in (19 mm).

 

Data entry and calculations for this test are performed on the California Bearing Ratio form described in the next section. After the data and calculations have been performed the results are displayed in a test report as described in the reporting section below. The format of this report is controlled by the geotechnical template used for the test.

 

The methodology and calculations for this test adhere to "ASTM D1883-99 Standard Test Method for CBR (California Bearing Ratio) of Laboratory-Compacted Soils". For more detailed information on the methodology and calculations please review this standard.