11. Cracks and Their Role in Accelerating Permeability

Try these first

1. 1.

   What is meant by permeability in concrete?

   Hint

   Think about how water interacts with concrete.

2. 2.

   What happens to durability when cracks appear?

   Hint

   Remember how roads can deteriorate with cracks.

3. 3.

   What effect do cracks larger than 0.3 mm have on concrete?

   • Decrease permeability
   • Increase chloride ingress
   • Improve durability

   Hint

   Consider how much easier it is for water to flow through a larger hole.

4. 4.

   True or False: Autogenous healing is effective for all sizes of cracks.

   • True
   • False

   Hint

   Recall the limitations of concrete self-repair abilities.

5. 5.

   You have a concrete structure with a crack measuring 0.4 mm. Explain the potential risks associated with such a crack and suggest a remedy.

   Hint

   Think of how repair methods can restore integrity.

6. 6.

   Describe the role of environmental conditions in the effectiveness of autogenous healing in concrete and provide examples.

   Hint

   Evaluate the location of the structure in terms of humidity and temperature.