2.1. Types of Transport Mechanisms

Try these first

1. 1.

   Define permeation in the context of concrete.

   Hint

   Think about how fluids flow through soil.

2. 2.

   What is diffusion?

   Hint

   Consider how perfume spreads in a room.

3. 3.

   What does permeation refer to?

   • Movement of fluids under pressure
   • Movement of heat
   • Movement of solid particles

   Hint

   Think about how water moves through soil.

4. 4.

   True or False: Diffusion is not important for concrete durability.

   • True
   • False

   Hint

   Reflect on how gases can enter through tiny openings.

5. 5.

   Imagine a scenario where a concrete structure is failing due to extensive chloride ingress. Discuss how the mechanisms of permeation and diffusion may have contributed to this failure.

   Hint

   Consider the environmental conditions affecting the concrete.

6. 6.

   A recent study shows high moisture levels are saturating the concrete mix. How could capillary action and wick action affect the integrity of a concrete wall?

   Hint

   Think about how moisture can move both horizontally and vertically.