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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

concrete-construction

NOTES: When both fine and coarse aggregates are poorly graded, the following general rules regarding suitable proportioning of these will be found helpful:

  1. For maximum size of coarse aggregates as 40mm and over, sand should be half as much as coarse aggregates.
  2. For maximum size of coarse aggregates as 20mm and over, sand should be two-thirds as much as coarse aggregates.
  3. For maximum size of coarse aggregates as 16mm, sand and coarse aggregates should be in equal parts.