3.3. Grading of Aggregates

Try these first

1. 1.

   List the four grading zones for fine aggregates.

   Hint

   Think about the order from coarsest to finest.

2. 2.

   What is the fineness modulus used for?

   Hint

   It's an empirical value.

3. 3.

   Which grading zone is the coarsest?

   • Zone I
   • Zone II
   • Zone III
   • Zone IV

   Hint

   Recall the classification from coarsest to finest.

4. 4.

   True or False: Continuous grading enhances void space in concrete mixtures.

   • True
   • False

   Hint

   Think about the packing of aggregate sizes.

5. 5.

   Analyze a situation where a contractor chooses gap grading for a concrete project. Discuss both the benefits and drawbacks emphasizing workability and durability.

   Hint

   Think about the requirements for different concrete applications.

6. 6.

   A concrete engineer has a fineness modulus of 2.5 for their aggregate. What adjustments should they make to their water-cement ratio during mix design?

   Hint

   Consider how aggregate size affects water absorption.