6. Indian Standard Soil Classification System

Try these first

1. 1.

   What defines fine-grained soils?

   Hint

   Think about the particle size.

2. 2.

   Name two types of fine-grained soils.

   Hint

   These are differentiated based on their plasticity.

3. 3.

   What percentage of fine-grained soils must be smaller than 0.075 mm?

   • 50%
   • 60%
   • 40%

   Hint

   Recall the definition of fine-grained soils.

4. 4.

   True or False: The liquidity index indicates the moisture content in relation to consistency limits.

   • True
   • False

   Hint

   Focus on the relationship between water content and soil state.

5. 5.

   A soil has a liquid limit of 55% and a plastic limit of 35%. If the clay content is 65%, determine the plasticity index, activity, and categorize the soil.

   Hint

   Perform each calculation step by step.

6. 6.

   Given a liquid limit of 70%, plastic limit of 40%, and moisture content of 65%, classify the consistency of the soil and its liquidity index.

   Hint

   Make sure to check all definitions for classification.