15.4. Superpave Aggregate Specifications

Try these first

1. 1.

   What does CAA stand for?

   Hint

   Think about how it describes the shape of larger aggregates.

2. 2.

   What is the purpose of the Sand Equivalent Test?

   Hint

   Consider what impurities might affect pavement performance.

3. 3.

   What is the primary role of coarse aggregate angularity in asphalt performance?

   • To improve water drainage
   • To enhance interlock and stability
   • To reduce density

   Hint

   Think about how the shape of aggregates affects their packing.

4. 4.

   True or False: Flat and elongated particles improve the performance of asphalt pavements.

   • True
   • False

   Hint

   Consider how shape influences the stability of a mix.

5. 5.

   Design a Superpave mix, ensuring proper aggregate gradation for a windy coastal area. Discuss how you'll choose and balance aggregate sizes.

   Hint

   Think about local environmental conditions and their impact on mix design.

6. 6.

   Explain the potential impacts of using overly rounded aggregates in a Superpave mix for a high-traffic urban road.

   Hint

   Consider how shape influences performance in high-traffic situations.