6.4.1. Origin and Production

Try these first

1. 1.

   What is Fly Ash?

   Hint

   Think about where electricity comes from and what is produced as waste.

2. 2.

   Name the two classes of Fly Ash.

   Hint

   Consider their calcium content.

3. 3.

   What is the main purpose of using Fly Ash in concrete?

   • Increase cost
   • Enhance workability
   • Decrease durability

   Hint

   Focus on the performance benefits.

4. 4.

   Class C Fly Ash is known for its high calcium content.

   • True
   • False

   Hint

   Think about the classification criteria.

5. 5.

   Given a concrete mix with 20% Fly Ash, calculate the total binder content needed if the total cement weight is 500 kg.

   Hint

   Think about how Fly Ash replaces a percentage of the total binder.

6. 6.

   You are designing a mix for mass concrete using Class C Fly Ash. Describe how you would adjust for early strength gain and explain why.

   Hint

   Consider the typical performance properties of Class C Fly Ash.