Question
Download Solution PDFThe initial setting time for ordinary Portland cement as per BIS specifications should not be less than:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
As per IS 269,
The initial setting time of OPC is 30 minutes.
The final setting time of OPC is 10 hours.
Important Points The ordinary Portland cement has been classified as 33 Grade (IS 269:1989), 43 Grade (IS 8112:1989), and 53 Grade (IS 12669-1987).
The physical requirements of all these three types of cement are almost the same except for compressive strength and are as follows:
| Physical Requirement | Method of Testing |
| Soundness | Le Chatelier |
| Autoclave | |
| Fineness (Specific surface in m2/kg) | Blaine's air permissibility |
|
Setting time |
Vicat's Apparatus |
| Initial (min) | |
| Final (max) | |
| Compressive Strength (MPa) not less than | Compression test |
| 72 ± 1 hr | |
| 168 ± 2 hr | |
| 672 ± 4 hr |
Last updated on Jun 4, 2025
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