Every concrete grade is written as a letter and a number — M-20, M-30, and so on. The 'M' stands for mix, and the number is the characteristic compressive strength in megapascals (MPa) the concrete should reach 28 days after pouring. A higher number means stronger concrete.
The common grades and where they go
| Grade | Strength | Typical use |
|---|---|---|
| M-7.5 / M-10 | 7.5–10 MPa | PCC, levelling course, non-structural fill |
| M-15 | 15 MPa | Plain footings, flooring base |
| M-20 | 20 MPa | Standard residential RCC — slabs, beams |
| M-25 | 25 MPa | Reinforced structural work, most buildings |
| M-30 – M-40 | 30–40 MPa | Columns, high-rise, heavily loaded members |
| M-45 – M-60 | 45–60 MPa | High-rise, bridges, special structural design |
Nominal mix vs design mix
Lower grades (up to about M-20) can be made with a nominal mix — fixed cement:sand:aggregate ratios. Higher grades use a design mix, where proportions are calculated and tested for the target strength. Ready-mix concrete (RMC) is always batched to a design mix at the plant, which is why it gives consistent strength pour after pour.
Why RMC over site mixing for higher grades
- Precise, lab-controlled proportions
- Consistent quality across large pours
- No site storage of cement, sand and aggregate
- Faster placement with transit mixers and pumps
Unique Sales Corporation arranges UltraTech ready-mix concrete from M-7.5 to M-60 in Gurugram, delivered to site by transit mixer.
Need ready-mix concrete (rmc)?
Authorized supply in Gurugram with delivery to site.