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CBR for base-course in roadworks

CBR for base-course in roadworks

CBR for base-course in roadworks

(OP)
I would like to find out if an unsoaked CBR value can exceed 100% for a base-course material: maximum size aggregate 37.5mmm and having a continuous grading curve, sourced from a borrow pit.
Thanks for your help.

RE: CBR for base-course in roadworks

Yes, it's possible.  After all CBR is a ratio (California Bearing Ratio) and is based on the subgrade response of a reference aggregate material.  If your aggregate material has a greater strength then the reference aggregate material, then the subgrade support will be greater.  One word of caution:  What is your justification for using unsoaked CBR value?  There is a potential for your subgrade strength to be affected by the dry strength of the compacted sample.

f-d

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