3.2. Carbonation Front

Try these first

1. 1.

   What is carbonation?

   Hint

   Think about what gas interacts with concrete.

2. 2.

   What does phenolphthalein indicate in concrete?

   Hint

   What color shows alkalinity?

3. 3.

   What is the main chemical reaction occurring in carbonation?

   • Ca(OH)₂ + CO₂ → CaCO₃
   • CaCO₃ + H₂O → Ca(OH)₂
   • CO₂ + H₂O → C₆H₁₂O₆

   Hint

   Focus on the primary ingredients involved in the reaction.

4. 4.

   Carbonation can lead to which of the following?

   • True
   • False

   Hint

   Think about the consequences of acidity in concrete.

5. 5.

   Evaluate how different environmental conditions (high humidity vs. low humidity) affect the carbonation rate of concrete structures placed in marine environments.

   Hint

   Consider the relationship between moisture and gas penetration.

6. 6.

   Propose a project to monitor carbonation development in a new concrete bridge. What methods would you use, and what factors would you consider?

   Hint

   Think about the tools used to measure carbonation and how environmental factors are controlled.