5.3.3. Grading Limits and Zones

Try these first

1. 1.

   What is meant by grading of aggregates?

   Hint

   Think about how size affects concrete properties.

2. 2.

   How many grading zones are there for fine aggregates?

   Hint

   Recall the zones we discussed.

3. 3.

   What are the four grading zones for fine aggregates?

   Hint

   Recall the zones discussed in class.

4. 4.

   True or False: Coarse aggregates grading depends solely on shape.

   Hint

   Focus on what determines coarse aggregate properties.

5. 5.

   A concrete mix is designed using only Zone I aggregates. What would be the anticipated effects on workability and strength?

   Hint

   Consider how larger particles interact with water and cement.

6. 6.

   If a contractor used a mix primarily composed of Zone IV aggregates, discuss the implications for the overall cost of the concrete mix.

   Hint

   Reflect on the balance between material costs and performance needs.