17.5.5. Step 5: Selection of Aggregate Ratio and Grading

Try these first

1. 1.

   Define coarse aggregate in the context of concrete mix design.

   Hint

   Think about the size of the aggregate.

2. 2.

   What is a grading limit?

   Hint

   Consider how sizes are classified.

3. 3.

   What is the primary focus when selecting aggregate ratios for concrete mix design?

   • Visual appeal
   • Aggregate size only
   • Strength and workability

   Hint

   Remember the relationship between aggregates and performance.

4. 4.

   True or False: Zone II sand is preferred in concrete mix for its compatibility with other aggregates.

   • True
   • False

   Hint

   Think about classifying sands.

5. 5.

   Design a concrete mix for a pavement considering varying traffic loads. Discuss how you would select the aggregate ratio and what grading limits to consider.

   Hint

   Reflect on how aggregates contribute to load-bearing capacity.

6. 6.

   Imagine a scenario where a concrete pavement fails prematurely. Assess how improper aggregate selection could lead to this issue and propose remedial actions.

   Hint

   Think about the physical properties affected by the aggregates.