3.5. Mineral Admixtures

Try these first

1. 1.

   What is a mineral admixture?

   Hint

   Think about what changes are desired in concrete.

2. 2.

   Name one type of mineral admixture.

   Hint

   This material is a byproduct of burning coal.

3. 3.

   What is the primary purpose of mineral admixtures in concrete?

   • To increase cost
   • To enhance performance
   • To add weight

   Hint

   Consider why we want to change concrete properties.

4. 4.

   True or False: Silica fume increases the permeability of concrete.

   • True
   • False

   Hint

   Think about whether more permeability is desirable.

5. 5.

   Design a mix for SCC using both fly ash and silica fume. Explain the reasoning behind your proportions.

   Hint

   Consider how each admixture influences the mix properties.

6. 6.

   Evaluate a scenario where an SCC mix contains an excessive amount of GGBFS. What potential issues could arise?

   Hint

   Think about how GGBFS interacts with other components in a mix.