3.9. Admixtures (if any)

Try these first

1. 1.

   What are admixtures in concrete?

   Hint

   Think about what additives do to a mixture.

2. 2.

   Name one type of admixture.

   Hint

   Consider which admixture enhances workability first.

3. 3.

   What is the primary purpose of admixtures in concrete?

   • To increase water content
   • To enhance concrete properties
   • To reduce strength

   Hint

   Think about what additives are for in mixtures.

4. 4.

   True or False: Superplasticizers decrease workability in concrete.

   • True
   • False

   Hint

   Consider how superplasticizers function within a mix.

5. 5.

   You are designing a mix for a high-performance concrete structure. Which admixture would you choose and why? Consider environmental factors in your decision.

   Hint

   Focus on the properties required for high-performance applications.

6. 6.

   A contractor reported issues with achieving required workability despite high water content. Suggest potential remedies using admixtures.

   Hint

   Consider the benefits of reducing water content relative to workability.