2.3. Influence of Aggregate and Mix Design

Try these first

1. 1.

   What is the effect of using denser aggregates in concrete?

   Hint

   Think about how heavier materials behave under stress.

2. 2.

   What does a higher water-cement ratio generally result in?

   Hint

   Consider the trade-offs between workability and strength.

3. 3.

   Which factor enhances the compressive strength of concrete?

   • Lighter aggregates
   • Denser aggregates
   • Higher water-cement ratio

   Hint

   Think about materials that can withstand more load.

4. 4.

   True or False: A higher water-cement ratio makes concrete less prone to cracking.

   • True
   • False

   Hint

   Consider what happens when the structure is under stress.

5. 5.

   If a concrete mix originally had a water-cement ratio of 0.40 and was changed to 0.55, how would you expect the performance to differ, especially in terms of structural applications?

   Hint

   Consider how strength and ductility relate to this change.

6. 6.

   Design a concrete mix targeting high durability in a marine environment. Discuss your choice of aggregates, water-cement ratios, and admixtures.

   Hint

   Think about what properties are critical for marine applications.