Question

Coarse grained soils, containing fines between 5-12%, are designated by ___________ Symbol.

(a) GW-GM and SP-SM

(b) CL-ML

(c) None of the mentioned

(d) All of the mentioned

This question was addressed to me in examination.

I'm obligated to ask this question of Unified Soil Classification topic in chapter Classification of Soils of Geotechnical Engineering I

Answer 1

Correct option is (a) GW-GM and SP-SM

The explanation is: If the percentage of fines lies between 5 to 12 %, coarse grained soils are designated by dual symbols GW-GM or SP-SM.