6.2.1. Origin and Production

Try these first

1. 1.

   What is fly ash?

   Hint

   Think about what is produced when coal is burned?

2. 2.

   What are the two types of fly ash?

   Hint

   Recall the letters used to categorize fly ash.

3. 3.

   What is the primary source of fly ash?

   • Burning of natural gas
   • Combustion of coal
   • Solar power generation

   Hint

   Think about fossil fuels commonly used for energy.

4. 4.

   True or False: Class F fly ash is high in calcium.

   • True
   • False

   Hint

   Recall the characteristics of Class F.

5. 5.

   Describe the effects of replacing 30% of cement with Class C fly ash in a concrete mix. Include considerations of strength, durability, and hydration heat.

   Hint

   Consider the trade-offs in short-term vs. long-term performance.

6. 6.

   How would you approach a project requiring mass concrete where heat generation needs to be controlled using fly ash? Outline the steps you would take.

   Hint

   Think about combining environmental considerations with material choice.