3. Gas and Fluid Transport in Concrete

Try these first

1. 1.

   What is carbonation in concrete?

   Hint

   Think about how gases interact with concrete.

2. 2.

   What is permeability?

   Hint

   Consider how water moves through materials.

3. 3.

   What gas primarily affects concrete durability by causing corrosion?

   • O₂
   • CO₂
   • N₂

   Hint

   Think about the chemical reactions occurring in concrete.

4. 4.

   True or False: Higher permeability generally leads to better durability in concrete.

   • True
   • False

   Hint

   Consider how substitutions impact structure.

5. 5.

   Given a concrete sample with significant chloride ingress, describe how this could impact the structural integrity over a 20-year period.

   Hint

   Think about metal exposed to saltwater.

6. 6.

   If a new type of pozzolanic material is introduced that significantly reduces the permeability of concrete, predict the effects on durability.

   Hint

   What do you think happens to materials that resist moisture?