The initial and final setting time of the Ordinary Portland Cement is
- ALess than 30 minutes and less than 600 minutes
- BMore than 30 minutes and more than 600 minutes
- CMore than 30 minutes and less than 600 minutesCorrect
- DLess than 30 minutes and more than 600 minutes
Solution
Concept
Setting times of OPC
Step-by-step solution
1. IS 4031: initial setting time not less than 30 minutes. 2. Final setting time not more than 600 minutes.
Explanation
Cement must stay workable for 30 minutes and harden within 10 hours.
Why the other options are wrong
Others reverse the limits.
Shortcut
≥30 min, ≤600 min.
Correct answer: C) More than 30 minutes and less than 600 minutes