The slab is the biggest single pour in a house, so cement choice gets the most debate. The answer is simpler than the debate.
OPC 53 or PPC?
| OPC 53 | PPC | |
|---|---|---|
| Early strength | High — props off sooner | Lower early |
| Long-term durability | Good | Very good, denser |
| Heat while setting | Higher; more crack risk in summer | Lower |
| Curing | At least 7 days (10 in hot weather) | At least 10 days (14 in hot weather) |
| Price | Slightly higher | Usually lower |
Both are used for house slabs in Hyderabad. If the schedule needs early de-propping, OPC 53; otherwise PPC is an excellent, economical choice — always as your drawing specifies.
What Matters More Than the Cement
- Concrete grade — M20 or M25 as specified.
- Water — no extra water at the mixer.
- Compaction — needle vibrator throughout.
- Curing — ponding for 10–14 days.
- Freshness — cement packed within about four weeks.
- One brand, one type for the whole pour.
How Much to Buy
| Slab | Concrete | Cement (M20) |
|---|---|---|
| 500 sq ft, 125 mm | 5.8 m³ | about 47 bags |
| 1,000 sq ft, 125 mm | 11.6 m³ | about 94 bags |
| 1,200 sq ft, 150 mm | 16.7 m³ | about 135 bags |
Add a few bags spare. Order the whole slab's cement in one lot so it is consistent and reaches a better quantity price.
The Short Version
OPC 53 or PPC as specified, one fresh brand for the whole slab, and good concreting practice. The process makes more difference than the logo.
