Inputs
Method (ASTM D1883)
- CBR @ 2.5 = (P/13.24)·100, CBR @ 5.0 = (P/19.96)·100 (loads in kN; standard test).
- Reported CBR = larger of the two penetration values (typically 2.5 mm).
- Subgrade rating: <3 very poor, 3–7 poor-fair, 7–20 fair-good, 20–50 good-excellent.
Results
CBR @ 2.5 mm—
CBR @ 5.0 mm—
Reported CBR—
Rating—