4.7. Effects on Properties of Concrete

Try these first

1. 1.

   What do admixtures do to the workability of concrete?

   Hint

   Think about how they help with flow and handling.

2. 2.

   Name one effect that accelerators have on concrete.

   Hint

   Recall what happens in cold weather conditions.

3. 3.

   What is the primary benefit of using water reducers in concrete?

   • Increase water content
   • Decrease water content while maintaining workability
   • Reduce setting time

   Hint

   Think about the goal of reducing excess water.

4. 4.

   True or False: Retarders can be used to hasten the setting time of concrete.

   • True
   • False

   Hint

   Reflect on the terminology of 'retard' and 'accelerate'.

5. 5.

   You are constructing a bridge in a coastal area where there is a high risk of corrosion. Describe what type of admixtures you would recommend and justify your choice.

   Hint

   Consider the specific issues of salt and moisture in coastal environments.

6. 6.

   During a hot summer construction project, the workers have a short window to pour concrete before it sets too quickly. Which admixture would you utilize, and why?

   Hint

   Think about the conditions and how they affect concrete setting.