Use the Unified Soil Classification System (USCS) to classify (group symbol and

Question

Use the Unified Soil Classification System (USCS) to classify (group symbol and group name) the following soils. Please answer soil No. 1-6 and give solutions to the answers aswell.

Soil Use the Unified Soil Classification System (USCS) to classify (group symbol and group name) the followings soils: Soil Soil Group Group No. Soil Properties Symbol Name From sieve analysis: 15% passing No. 4 sieve; 2% passing No. 1200 sieve: coefficient of uniformity = 5.0; coefficient of gradations 2.00. From sieve analysis: 72% passing No. 4 sieve; 33% passing No. 200 sieve. From Atterberg limit tests on fine fraction: Liquid limit = 35%; plasticity index = 21%. 100 pm 80 60 E 40 20 1000 100 10 0.1 0.01 Particle Size (mm) From sieve analysis: 20% retained on No. 4 sieve; 49% retained on No. 200 sieve. From Atterberg limit tests on fine fraction: Liquid limit = 10%; plasticity limit = 5%. 5 From sieve analysis: 0% retained on No. 4 sieve; 24% retained on No. 200 sieve. From Atterberg limit tests on fine fraction: Liquid limit = 60%; plastic limit = 30%. 6 Soil contains primarily organic material and is dark in color

Explanation / Answer

1) GW- well graded gravel

2) CL- Inorganic clays of low to medium plasticity, clays, sandy clays, silty clays, lean clays

3) SW- Well graded sands

4)CL_ML inorganic clays, inorganic silts

5)CH- inorganic clay of plasticity, fat clays

6)pt- peat

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