3.7.3. Maximum Size of Aggregates

Try these first

1. 1.

   What is the maximum size of aggregates recommended for thin sections?

   Hint

   Think about concrete sections that are thinner, like slabs.

2. 2.

   How does a larger aggregate size benefit concrete mixtures?

   Hint

   Consider what the size might do with surface area.

3. 3.

   What is the maximum size of aggregates for thin sections of concrete?

   • 10 mm
   • 20 mm
   • 30 mm

   Hint

   Think about the thickness of concrete you're working with.

4. 4.

   True or False: Larger aggregates always lead to stronger concrete.

   • True
   • False

   Hint

   Consider the balance between size and bonding.

5. 5.

   Design a concrete mix for a load-bearing column where the minimum member thickness is 150 mm. What is the maximum allowable aggregate size?

   Hint

   Use the 1/4 rule to determine how big the aggregates can be.

6. 6.

   You need to create a concrete mix for a floor slab that is 80 mm thick. Discuss the trade-offs of using larger versus smaller aggregates in this application.

   Hint

   Think about how thickness impacts the requirements.