5.1.C.4. Flaky and Elongated Aggregates

Try these first

1. 1.

   Define flaky aggregates.

   Hint

   Think about the thickness comparison.

2. 2.

   What are elongated aggregates?

   Hint

   Focus on the length comparison.

3. 3.

   What defines flaky aggregates?

   • Thickness less than 0.6 times mean size
   • Length greater than 1.8 times mean size
   • Angular-shaped aggregates

   Hint

   Focus on the thickness measurement.

4. 4.

   True or False: Elongated aggregates improve workability in concrete.

   • True
   • False

   Hint

   Recall the definition and effects.

5. 5.

   In a construction scenario, you are tasked with designing a concrete mix for a structural support beam. Given a sample of aggregates with a high flakiness and elongation index, discuss the potential impact on the beam’s structural integrity.

   Hint

   Analyze how aggregate properties affect concrete performance.

6. 6.

   Evaluate a case where a ready-mix concrete supplier has received complaints about cracks forming in concrete structures. The aggregates used were, upon testing, found to be high in flaky and elongated particles. Propose a method for remedying this issue in future mixes.

   Hint

   Consider how preventive measures can improve quality.