1.4.1. AASHTO Soil Classification System

Try these first

1. 1.

   What is the primary purpose of the AASHTO Soil Classification System?

   Hint

   Think about what classification helps engineers achieve.

2. 2.

   What does A-1 soil indicate?

   Hint

   Consider which group supports road infrastructure best.

3. 3.

   What is the primary function of the AASHTO classification system?

   • To measure soil depth
   • To assess soil suitability for pavement
   • To calculate soil density

   Hint

   Think about paving roads.

4. 4.

   True or False: A higher Group Index indicates better soil quality for subgrade.

   • True
   • False

   Hint

   Recall how the Group Index is defined.

5. 5.

   A project requires a subgrade with a Group Index lower than 2. Given a soil with 35% passing No. 200 sieve, LL of 48, and PI of 12, evaluate if this soil meets the requirement by calculating the GI.

   Hint

   Follow the formula closely, noting each element's impact.

6. 6.

   Discuss how improper soil classification can lead to pavement failure and what preventive measures should be taken.

   Hint

   Think about the impacts of incorrect assessments on infrastructure.