Lesson 5/Learning Event 2
FIGURE 35. TYPICAL CBR PENETRATION TEST RESULTS
The next question that arises is which value should be used. The larger of the two CBR values is used
and should CBR(.2) be the largest it must be verified by testing another sample. This selection criteria
implies that:
Strengths used to design a pavement will be measured at no more than 0.2 inch of soil
deformation.
If CBR(.1) is greater than CBR(.2), the soil sample has begun plastic failure between these limits
of deformation and soil strengths obtained at plastic failure will not be used.
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