6.3. Divisions of plasticity

Try these first

1. 1.

   What is considered low plasticity according to the liquid limit?

   Hint

   Think about the numerical value compared to 35%.

2. 2.

   What does the A line on the plasticity chart represent?

   Hint

   It's linked with the plasticity index.

3. 3.

   What classification corresponds to a liquid limit greater than 50%?

   • CL
   • CH
   • ML

   Hint

   Think about the group symbols for different plasticity levels.

4. 4.

   True or False: The plasticity index is calculated as the difference of the liquid limit and plastic limit.

   • True
   • False

   Hint

   Recall the definition of the plasticity index.

5. 5.

   Given a soil sample with a plasticity index of 30%, liquid limit of 60%, and clay content of 70%, classify the soil and determine its liquidity index.

   Hint

   Remember to calculate the plasticity index and use it to understand the liquidity.

6. 6.

   A soil with well-defined low plasticity shows an activity of 0.5. What can we infer about its clay content?

   Hint

   Reference the definition of activity and consider how it compares to the percentages discussed.