8.1. Microstructure of Hardened Cement Paste

Try these first

1. 1.

   What are capillary pores?

   Hint

   Think about the size range and connection in the pore structure.

2. 2.

   Why are gel pores important?

   Hint

   Consider their size compared to capillary pores.

3. 3.

   What is the primary function of capillary pores in hardened cement paste?

   • Reduce strength
   • Increase fluid ingress
   • Improve durability

   Hint

   Think about what larger pores can do in concrete.

4. 4.

   True or False: Gel pores are larger than capillary pores.

   • True
   • False

   Hint

   Remember the size differences described earlier.

5. 5.

   How would you design a concrete mix to optimize the microstructure for a marine environment where durability is essential?

   Hint

   Consider all factors that contribute to both hydration and pore structure.

6. 6.

   Analyze the potential failure modes of concrete in an area with high chloride exposure due to capillary and gel pore characteristics.

   Hint

   Think about how pore size contributes to fluid movement and vulnerability.