Classify the following soils according to the USCS a) A sample of well-graded gr
ID: 1845043 • Letter: C
Question
Classify the following soils according to the USCS
a) A sample of well-graded gravel with sand has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand, and 2% fines. The maximum size of the particles is 75 mm. The coefficient of curvature is 2.7, while the uniformity coefficient is 12.4.
b) A dark brown, wet, organic-odor soil has 100% passing the No. 200 sieve. The liquid limit is 32% (not dried, and is 21% when oven dried!) and the plastic index is 21% (not dried).
c) This sand has 61% predominately fine sand, 23% silty fines, and 16% fine surrounded gravel size. The maximum size is 20 mm. The liquid limit is 33% and the plastic limit is 27%.
d) This material has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. The liquid limit (not dried) is 37% while it is 26% when oven dried. The plastic index (not dried) is 6.
Explanation / Answer
(a) GW - well graded gravel with sand.
(b) OL- organic clay
(c) SM - slity sand with gravel
(d) SM- silty sand with organic fines