3. Carbonation of Concrete

Try these first

1. 1.

   What is carbonation in concrete?

   Hint

   Think of the gas that reacts with concrete.

2. 2.

   What color does phenolphthalein turn in alkaline conditions?

   Hint

   What color indicates a basic reaction?

3. 3.

   What chemical process occurs when CO₂ interacts with concrete?

   • Oxidation
   • Carbonation
   • Hydration

   Hint

   Consider the name of the process.

4. 4.

   True or False: Carbonation increases the pH level of concrete.

   • True
   • False

   Hint

   Think about whether carbonation is making something more or less alkaline.

5. 5.

   Assess a theoretical concrete mix with high permeability. Describe how this would influence carbonation depth over 10 years and suggest mitigative measures.

   Hint

   Consider permeability's role and how to enhance durability.

6. 6.

   Devise an experimental method to measure the rate of carbonation in two different concrete compositions. Discuss expected outcomes.

   Hint

   Think about which factors will alter your experimental results.