5. Aggregates – Properties, Grading, Testing

Try these first

1. 1.

   What is the main difference between fine and coarse aggregates?

   Hint

   Think about the size distinction.

2. 2.

   Name a common natural aggregate.

   Hint

   Look around construction sites for examples.

3. 3.

   What defines fine aggregates?

   • Passed through a 4.75 mm IS sieve
   • Retained on a 4.75 mm IS sieve
   • Aggregates over 20 mm size

   Hint

   Refer to the classification based on particle size.

4. 4.

   True or False: Recycled aggregates can include materials from demolished concrete.

   • True
   • False

   Hint

   Think about sustainability in construction practices.

5. 5.

   Explain how the use of recycled aggregates can impact concrete durability and strength. Provide examples where recycled aggregates have been successfully used.

   Hint

   Consider the balance between sustainability and quality.

6. 6.

   Evaluate the importance of conducting multiple tests on aggregates prior to concrete mix design. What might happen if one test is overlooked?

   Hint

   Think about how different tests contribute to the overall performance of concrete.