Which of the following pairs in respect of Ordinary Portland Cement (OPC) are correctly matched?
1. Initial setting time ... 30 minutes
2. Final setting time ….10 hours
3. Normal consistency …. 10%
Select the correct answer using the codes given below:
• Statement 1 – Correct: The initial setting time of OPC should not be less than 30 minutes.
• Statement 2 – Correct: The final setting time of OPC should not be more than 600 minutes (10 hours).
• Statement 3 – Incorrect: Normal consistency of OPC is not 10%. It is generally around 26–30% water by mass of cement and is determined experimentally using the Vicat apparatus.Preparing students for success in a changing World.
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