2.4. Hydration Reactions

Try these first

1. 1.

   What does C-S-H stand for?

   Hint

   Think about what the products of hydration contribute to strength.

2. 2.

   Which compound is formed when C₃A hydrates?

   Hint

   Remember the role of gypsum in this reaction.

3. 3.

   What is the primary product formed when C₃S hydrates?

   • Monosulphate
   • C-S-H
   • Ettringite

   Hint

   Focus on the products of C₃S reaction.

4. 4.

   True or False: The hydration of C₃A does not require the addition of gypsum.

   • True
   • False

   Hint

   Consider the consequences of uncontrolled reactions.

5. 5.

   What would happen if no gypsum were added during the mixing of cement containing C₃A?

   Hint

   Consider the effects of rapid reactions without control.

6. 6.

   Analyze the significance of heat generation from the hydration of C₃S versus C₂S regarding practical applications in cold weather.

   Hint

   Think about how temperature affects concrete curing in different weather.