6.4.2. Properties

Try these first

1. 1.

   What is fly ash?

   Hint

   Think of what is left after coal combustion.

2. 2.

   What property does silica fume significantly improve?

   Hint

   It has a very high surface area.

3. 3.

   What is the main benefit of using fly ash in concrete?

   • It increases early strength
   • It slows hydration
   • It improves workability

   Hint

   Recall the functions of fly ash.

4. 4.

   Silica fume can increase the water demand of concrete mixes.

   • True
   • False

   Hint

   Think about its particle size.

5. 5.

   Describe a scenario where using silica fume would be advantageous in construction. Explain your reasoning.

   Hint

   Consider structural integrity and environmental factors.

6. 6.

   Design a concrete mix for a marine environment, identifying which mineral admixtures to include and their intended benefits.

   Hint

   Think about the challenges posed by seawater exposure.