What is the typical pH value of fresh concrete?
- A7 – 8
- B9 – 10
- C11 – 13Correct
- D14 – 15
Solution
Concept
Alkalinity of concrete
Step-by-step solution
1. Fresh concrete pore solution has pH about 12.5–13.
Explanation
The high pH protects steel by passivation.
Why the other options are wrong
7–8 is neutral, 14–15 is not typical.
Shortcut
pH 12–13.
Correct answer: C) 11 – 13