6.4.3. Effects on Concrete

Try these first

1. 1.

   What does 'workability' refer to in concrete?

   Hint

   Think about mixing and pouring concrete.

2. 2.

   Name one advantage of using mineral admixtures in concrete.

   Hint

   Consider what happens when you add materials to the mix.

3. 3.

   Which of the following mineral admixtures improves workability?

   • Silica fume
   • Fly ash
   • GGBS

   Hint

   Think about the shape of particles in the mix.

4. 4.

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

   • True
   • False

   Hint

   What is one main purpose of adding admixtures?

5. 5.

   Evaluate a concrete mix design for a marine structure that must withstand chloride exposure. Explain how you would incorporate mineral admixtures to enhance durability.

   Hint

   Consider both strength and environmental resistance in your design.

6. 6.

   Design a construction schedule that considers the delayed initial strength gain due to silica fume in your concrete formulation. How would you mitigate risks during construction?

   Hint

   Think about how construction timelines are impacted by strength gains.