RECOMMENDED CONCRETE MIXES FOR VARIOUS TYPES OF CONSTRUCTION WORKS:
Type of work | App. Concrete Mix | Max. size of aggregates (mm) | Water for one cement bag batch (ltr) | ||
Total for dry aggregates | For aggregates condition from dry to moist | Best consistency | |||
Small precast work, fence posts, poles, garden furniture and other work of very thin sections | 1:2:2 | 16 | 20 | 15 to 16 | Soft |
Storage tanks, cisterns, sewers, well knerbs, watertight work, and columns or other structural parts subjected to high stresses | 1:2:3 | 20 | 25 | 19 to 22 | Medium |
Reinforced concrete work, floor slab, beams, columns, arches, stairs etc | 1:2.5:3.5 | 20 | 32 | 23 to 27 | Medium or soft |
Ordinary floors, footpaths, drive ways, steps, roads, pavements | 1:2.5:3.5 | 20 | 23 | 20 to 23 | Stiff |
Building and basement walls, silos, sills, lintels, machine foundations subject to vibration, bridges, dams, piers, etc exposed to action of water and frost foundation concrete for masonry walls | 1:2:4 | 40 | 30 | 23 to 26 | Stiff or Medium |
Culverts, retaining walls, compound walls, ordinary machine bases, etc. | 1:3:5 | 40 | 34 | 26 to 30 | Stiff or Medium |
Mass concrete for heavy walls, lean concrete for levelling course of RCC foundations | 1:3:6 | 63 | 36 | 30 to 32 | Medium |
NOTES: When both fine and coarse aggregates are poorly graded, the following general rules regarding suitable proportioning of these will be found helpful:
- For maximum size of coarse aggregates as 40mm and over, sand should be half as much as coarse aggregates.
- For maximum size of coarse aggregates as 20mm and over, sand should be two-thirds as much as coarse aggregates.
- For maximum size of coarse aggregates as 16mm, sand and coarse aggregates should be in equal parts.
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