7.6. Modern Practices to Improve Workability

Try these first

1. 1.

   What is a plasticizer?

   Hint

   Think about the role of plastics in keeping things flexible.

2. 2.

   Name one mineral admixture.

   Hint

   This material often comes from power plants.

3. 3.

   What is the purpose of plasticizers in concrete?

   • To increase water content
   • To improve workability
   • To speed up setting time

   Hint

   Think about how they affect mixing.

4. 4.

   True or False: Superplasticizers can increase the flow ability of concrete significantly.

   • True
   • False

   Hint

   Remember their extreme enhancement capabilities.

5. 5.

   You are tasked with a project in a hot climate where high-performance concrete is needed. Describe your approach concerning chemical and mineral admixtures you would select to ensure workability.

   Hint

   Consider the effects of temperature on concrete and which admixtures would help.

6. 6.

   Discuss how you would balance the use of chemical admixtures without compromising strength in a concrete mix required for heavy-load beams.

   Hint

   Think about the relationship between workability and strength and how admixtures can mediate this.