11.2. Silica Fume

Try these first

1. 1.

   What is silica fume?

   Hint

   Think about its source in industry.

2. 2.

   What does silica fume help to reduce in concrete?

   Hint

   It keeps water and chemicals out.

3. 3.

   What does silica fume primarily enhance in concrete?

   • Workability
   • Durability
   • Color

   Hint

   Think about the environmental factors it protects against.

4. 4.

   True or False: Silica fume is less effective than fly ash in reducing permeability.

   • True
   • False

   Hint

   Consider their physical properties.

5. 5.

   Given a concrete mix with a w/c ratio of 0.50, how would the introduction of silica fume affect this ratio if aiming for a durable mix? Discuss the implications.

   Hint

   Think about how water interacts with silica fume.

6. 6.

   You are tasked with designing a concrete mix for a coastal structure. Discuss the role of silica fume and considerations in the design process.

   Hint

   Recall the challenges presented by marine environments.