5.5. Carbonation Depth Test (Phenolphthalein Indicator)

Try these first

1. 1.

   What is carbonation in concrete?

   Hint

   Think about how CO₂ affects concrete chemistry.

2. 2.

   What does a pink color in phenolphthalein indicate?

   Hint

   Consider what pH levels lead to the pink color.

3. 3.

   What does the phenolphthalein indicator test in concrete?

   • A. Temperature changes
   • B. Carbonation depth
   • C. Compressive strength

   Hint

   What aspect of chemical reaction does it measure?

4. 4.

   True or False: A depth of carbonation less than 20 mm is considered safe for structural integrity.

   • True
   • False

   Hint

   What is the common threshold for safety?

5. 5.

   A field study shows that a concrete sample has a carbonation depth of 45 mm after 10 years. Discuss potential remedial measures.

   Hint

   Consider both chemical and physical protective strategies.

6. 6.

   Evaluate the impact of curing practices on the carbonation depth and overall structural performance over time.

   Hint

   Think about the relationships between hydration, pore structure, and carbonation rates.