1.4. Soil Classification Systems

Try these first

1. 1.

   What does AASHTO stand for?

   Hint

   Consider its relevance in pavement design.

2. 2.

   What is the primary focus of the Unified Soil Classification System?

   Hint

   Think about how soils are categorized.

3. 3.

   Which of the following is an empirical measure used in the AASHTO classification?

   • Group Index
   • Plasticity Index
   • Liquid Limit

   Hint

   Think about what each of these terms refers to in classification.

4. 4.

   True or False: The USCS system categorizes soils only based on Atterberg limits.

   • True
   • False

   Hint

   Consider what grain size means in soil classification.

5. 5.

   Given a soil sample with a GI of 10 and a PI of 15, analyze whether it would be suitable for A-2 classification and justify your reasoning.

   Hint

   Relate GI and PI to AASHTO standards for classification.

6. 6.

   If a project requires good drainage and low plasticity, which soils would you prioritize in your USCS classification and why?

   Hint

   Consider permeability and plasticity levels in the context of your project needs.