4.1. Types of Admixtures

Try these first

1. 1.

   What is the main purpose of an admixture?

   Hint

   Think about why additives are used in mixtures.

2. 2.

   Name one type of admixture.

   Hint

   Look at the roles each plays.

3. 3.

   What is the function of superplasticizers in concrete?

   • To delay setting time
   • To increase workability and strength
   • To reduce water requirement
   • To introduce air bubbles

   Hint

   Think about how they differ from regular plasticizers.

4. 4.

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

   • True
   • False

   Hint

   Remember the effects of temperature on concrete setting.

5. 5.

   Considering a construction project in a very humid environment, which admixtures would be prioritized for ensuring optimal performance and why?

   Hint

   Reflect on the properties of concrete under varying humidity.

6. 6.

   Explain how the use of silica fume would be advantageous in a project requiring high early strength concrete.

   Hint

   Think about how particle size and material characteristics contribute to performance.