4.1.2. Retarding Admixtures

Try these first

1. 1.

   What is the primary purpose of retarding admixtures?

   Hint

   Think about why you might need more time to work with concrete.

2. 2.

   Name one common retarding admixture.

   Hint

   Remember I mentioned common examples.

3. 3.

   What is the main function of retarding admixtures?

   • Speed up setting time
   • Delay setting time
   • No effect on setting time

   Hint

   Think about why you might need more time before concrete hardens.

4. 4.

   True or False: Sugar can be used as a retarding admixture.

   • True
   • False

   Hint

   Recall our discussion about common retarding substances.

5. 5.

   You are tasked with pouring concrete in a particularly hot climate. You want to avoid cold joints and ensure the quality of the concrete. What considerations and admixtures would you choose?

   Hint

   Think about the environmental conditions and their effects on setting time.

6. 6.

   A contractor used too much of a retarding admixture in a mix. What steps could you take to rectify the situation before the concrete sets?

   Hint

   What options do you have to address curing and hydration delays?