3.6. Use of Admixtures

Try these first

1. 1.

   What are admixtures?

   Hint

   Think about the purpose they serve in the mix.

2. 2.

   Name one type of mineral admixture.

   Hint

   It's often used to improve durability.

3. 3.

   What is the primary purpose of admixtures in concrete?

   • To increase water content
   • To modify the properties of concrete
   • To decrease strength

   Hint

   Think about why we need to change concrete mixes.

4. 4.

   True or False: Mineral admixtures can help reduce the density of concrete.

   • True
   • False

   Hint

   Reflect on how they fill space in the mix.

5. 5.

   A construction team is designing concrete for a highway that will experience heavy snowfall. What admixtures should be considered to enhance performance, and why?

   Hint

   Think about how snow and rapid temperature changes affect concrete.

6. 6.

   A concrete sample containing a high water-cement ratio is tested for durability under accelerated weathering conditions. Predict its performance and suggest suitable admixtures to improve its characteristics.

   Hint

   Consider the impact of water on concrete's structural integrity.