6.6.3. Effects on Concrete

Try these first

1. 1.

   What is the primary effect of fly ash in concrete?

   Hint

   Consider how materials can enhance mixing.

2. 2.

   What does silica fume primarily increase in concrete?

   Hint

   Think about strength attributes.

3. 3.

   What effect does fly ash have on concrete workability?

   • It decreases it
   • It enhances it
   • No effect

   Hint

   Think about how finer particles behave during mixing.

4. 4.

   Silica fume is classified as what type of material?

   • True
   • False

   Hint

   Consider the properties of pozzolans.

5. 5.

   A contractor is using a mix with high fly ash content. How should they adjust for early strength loss in competitive schedules?

   Hint

   Consider the interactions of materials that impact strength.

6. 6.

   Discuss how using a combination of mineral admixtures could improve a concrete mix destined for a marine environment.

   Hint

   Think about the environmental conditions that could challenge concrete durability.