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The laboratory CBR test is performed by measuring the pressure required to penetrate a soil sample with a plunger of a standard area. The measured pressure is then divided by the pressure required to achieve an equal penetration on a standard crushed rock material.
The harder the surface, the higher the CBR value. Typically, a value of 2% equates to clay, while some sands may have a CBR value of 10%. High quality sub-base will have a value over 30%.
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The laboratory CBR test is performed by measuring the pressure required to penetrate a soil sample with a plunger of a standard area. The measured pressure is then divided by the pressure required to achieve an equal penetration on a standard crushed rock material.
The harder the surface, the higher the CBR value. Typically, a value of 2% equates to clay, while some sands may have a CBR value of 10%. High quality sub-base will have a value over 30%.