2. Aggregates

Try these first

1. 1.

   What are fine aggregates?

   Hint

   Think about smaller particles that help with concrete's workability.

2. 2.

   Why is grading important for aggregates?

   Hint

   Consider how the size distribution might affect strength.

3. 3.

   What are aggregates primarily used for in concrete?

   • To bind other materials
   • To occupy space and provide bulk
   • To reduce weight

   Hint

   Think about the composition of concrete.

4. 4.

   True or False: Coarse aggregates can be larger than 40 mm.

   • True
   • False

   Hint

   Recall the standard classification sizes for aggregates.

5. 5.

   Given an aggregate with a water absorption rate of 6%, calculate how this would affect the water-cement ratio when using a mix design for concrete. If the specific gravity of the aggregate is 2.5, what considerations must be placed in the design?

   Hint

   Recall how absorption impacts mixing ratios.

6. 6.

   If an engineer has both rounded and angular coarse aggregates, explain how to decide which is more appropriate for a specific concrete application.

   Hint

   Consider the function of the concrete in the overall structure.