1.4.2. Unified Soil Classification System (USCS)

Try these first

1. 1.

   What are the two main categories of soils in the USCS?

   Hint

   Think about what passes through the No. 200 sieve.

2. 2.

   What does the symbol 'W' indicate in USCS?

   Hint

   It starts with the letter that stands for good soil.

3. 3.

   What are the major divisions in USCS?

   • A. Coarse-Grained
   • Fine-Grained
   • B. Organic
   • Inorganic
   • C. Sandy
   • Clayey

   Hint

   Think about grain size when classifying.

4. 4.

   The A-Line in the plasticity chart separates which types of soils?

   • A. Clay and Gravel
   • B. Silt and Clay
   • C. Sandy and Gravel

   Hint

   Consider what each type is known for.

5. 5.

   Given a soil sample with a moisture content of 25%, a plasticity index of 15, and a liquid limit of 32, determine its USCS classification.

   Hint

   Use the characteristics related to plasticity index and liquid limit to determine classification.

6. 6.

   Analyze a mixed soil sample consisting of 40% gravel, 30% sand, and 30% silt. Discuss its USCS classification.

   Hint

   Identify the dominant soil type based on composition percentages for classification.