6.3. Aggregate Gradation and Its Importance

Try these first

1. 1.

   What does 'gradation' refer to in aggregate terms?

   Hint

   Think about how the sizes of rocks are arranged.

2. 2.

   What type of gradation provides maximum density?

   Hint

   It’s not open or gap graded.

3. 3.

   What is the purpose of aggregate gradation?

   • To enhance color
   • To ensure proper compaction
   • To increase weight

   Hint

   Think about how tightly packed something needs to be.

4. 4.

   True or False: Open graded aggregates are used to maximize weight.

   • True
   • False

   Hint

   Consider what water does in aggregates.

5. 5.

   Given a specific traffic load and environmental conditions, design a suitable aggregate gradation strategy for a new pavement project.

   Hint

   Balance traffic needs with water management.

6. 6.

   Evaluate the advantages and disadvantages of selecting open graded aggregates for a major highway compared to dense graded aggregates. Provide your conclusions.

   Hint

   What compromises exist between drainage and load capacity?