3.1. Mechanism

Try these first

1. 1.

   What is durability in concrete?

   Hint

   Think about how materials stand up to wear and tear.

2. 2.

   What happens when water in concrete freezes?

   Hint

   Consider the physical properties of water when frozen.

3. 3.

   What expansion occurs when water in concrete freezes?

   • 5%
   • 9%
   • 10%

   Hint

   Consider the physical change water undergoes in cold temperatures.

4. 4.

   True or False: Low permeability in concrete helps prevent sulphate attacks.

   • True
   • False

   Hint

   Think back to how permeability affects water movement.

5. 5.

   Design a concrete mix for a bridge in a cold climate. Discuss considerations for freeze-thaw resistance.

   Hint

   What ingredients help manage moisture in harsh climates?

6. 6.

   Evaluate the impact of sulphate-rich soil on foundation design for a commercial building.

   Hint

   Consider how external factors affect concrete durability.