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The California bearing ratio (CBR) is a penetration test for evaluation of the mechanical strength of road subgrades and basecourses.

The study of "Effect of soaking period and surcharge load on resilient modulus and California bearing ratio of gypsiferous soils" revealed that the resilient modulus increased with surcharge load and a correlation to soaked CBR was developed. The correlation between the strength ratio CBRL/CBR45 and surcharge load is insensitive to soil type.

Surcharge is the volume of the test, like weights testing how a balance works.

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