USCS Classification of Clean Gravel
MediumUSCSgradation
A clean gravel has D10 = 5.0 mm, D30 = 9.5 mm and D60 = 15 mm. Its USCS classification is most nearly:
- AGP
- BGW
- CSW
- DSP
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Answer: A. GP
The particle sizes are above 4.75 mm, so this is a gravel. Cu = 15/5 = 3.0 and Cc = 9.5²/(5 × 15) = 1.20. A gravel needs Cu ≥ 4 to be well graded, so this soil is poorly graded, GP. SW and SP apply to sands.
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