18.2.5. Admixtures

Try these first

1. 1.

   What is an admixture in concrete?

   Hint

   Think about why we would want to change how concrete behaves.

2. 2.

   Name one benefit of using plasticizers.

   Hint

   Consider how they help in mixing the concrete.

3. 3.

   What is the purpose of air-entraining agents in concrete?

   • To reduce setting time
   • To enhance freeze-thaw resistance
   • To improve workability

   Hint

   Think about how air can prevent damage from expanding water.

4. 4.

   True or False: Accelerators slow down the curing process.

   • True
   • False

   Hint

   Consider the role of accelerators in cold conditions.

5. 5.

   Design a concrete mix for a cold environment considering admixtures. Recommend types and explain your choices.

   Hint

   Consider the properties you need to ensure before freezing temperatures are reached.

6. 6.

   Evaluate the environmental impact of reducing cement through the use of mineral admixtures. What considerations must be made?

   Hint

   Think about how sustainability fits in with engineering requirements.