The California bearing ratio (CBR) is a penetration test for evaluation of the mechanical strength of road subgrades and basecourses. It was developed by the California Department of Transportation before World War II. The test is performed by measuring the pressure required to penetrate a soil sample with a plunger of standard area. The measured ...
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http://en.wikipedia.org/wiki/California_bearing_ratio
The ratio of the force per unit area required to penetrate a soil mass with a 19.4 sq cm circular piston at the rate of 1.27 mm per min to the force required for corresponding penetration of a standard crushed-rock base material; the ratio is usually determined at 2.5 mm penetration.
Found on
https://www.encyclo.co.uk/local/21122
No exact match found.
