3.5. Testing of Aggregates

Try these first

1. 1.

   What does sieve analysis measure?

   Hint

   Think about how we separate different sizes.

2. 2.

   Why is specific gravity important in concrete?

   Hint

   What does density impact?

3. 3.

   What does the sieve analysis help to determine?

   • Water absorption
   • Particle size distribution
   • Aggregates' color

   Hint

   Think about how we sort materials based on size.

4. 4.

   True or False: A high aggregate crushing value is preferable for high-quality concrete.

   • True
   • False

   Hint

   Higher values generally suggest weaker material.

5. 5.

   Design a concrete mix for a highway that needs aggregates with a crushing value of less than 25%. Describe the testing methods you would employ to ensure quality.

   Hint

   Consider the types of tests previously discussed.

6. 6.

   An engineer discovers that the aggregates used in a concrete mix exhibit high alkali reactivity. Suggest mitigation strategies and explain their importance.

   Hint

   Review the alkali-aggregate reactivity section for strategies.