7.4. Viscosity-Modifying Admixtures (VMAs)

Try these first

1. 1.

   What does VMA stand for?

   Hint

   Think about viscosity in concrete.

2. 2.

   Name one benefit of using VMAs.

   Hint

   Think about how it makes concrete easier to handle.

3. 3.

   What does a VMA improve in concrete?

   • Flexibility
   • Viscosity
   • Color

   Hint

   Focus on what VMA stands for.

4. 4.

   True or False: VMAs help reduce bleeding in concrete.

   • True
   • False

   Hint

   Consider the actions of VMAs in preventing separation.

5. 5.

   Design a concrete mix for a vertical application that requires high viscosity. What VMAs would you utilize, and why?

   Hint

   Think about the characteristics of the blend and setting times.

6. 6.

   Evaluate a scenario where a construction site oversupplied VMAs to the mix. What effects would you anticipate?

   Hint

   Consider how increased viscosity impacts flow and application.