8. Role of Microstructure in Durability and Permeability

Try these first

1. 1.

   What are capillary pores?

   Hint

   Think about size and function in concrete.

2. 2.

   What is the role of gel pores?

   Hint

   Consider their size compared to capillary pores.

3. 3.

   What are the two types of pores in the microstructure of hardened cement?

   • Capillary and Gel
   • Gel and Thermal
   • Capillary and Fiber

   Hint

   Think about the terms we've just discussed.

4. 4.

   True or False: Unhydrated cement grains can strengthen concrete.

   • True
   • False

   Hint

   Consider how hydration impacts concrete's performance.

5. 5.

   Given a concrete mix with high capillary porosity, predict the potential long-term durability issues. What strategies could mitigate these issues?

   Hint

   Consider the relationship between porosity and fluid penetration.

6. 6.

   Analyze how controlling the formation of crystalline products can enhance concrete durability in a heavily saturated environment.

   Hint

   Think about how internal stresses affect surface integrity.