10.1. Types of Admixtures

Try these first

1. 1.

   What is an admixture?

   Hint

   Think about what is mixed with concrete besides water and aggregates.

2. 2.

   Name one type of admixture.

   Hint

   Remember the list we discussed in class.

3. 3.

   What does a plasticizer do in concrete?

   • Increases water content
   • Improves workability
   • Accelerates setting time

   Hint

   Think about how they function in mixing.

4. 4.

   True or False: Retarders speed up the setting time of concrete.

   • True
   • False

   Hint

   Focus on the purpose of retarders discussed in class.

5. 5.

   You are tasked with preparing a large concrete structure in a hot climate. Which admixtures would you consider using and why?

   Hint

   Think about the challenges posed by high temperatures.

6. 6.

   Analyze the implications of using too much air-entraining agent in a mix. What effects might this have on the concrete?

   Hint

   Consider the balance needed in concrete properties.