ABSTRACT
Aggregate, coarse 1500
Stone, crushed 1350
Ballast, all-in 1800
Concrete 2450
Suitability of mixes
Precast work in small sectional areas 1:1:2
Watertight reinforced concrete structures 1:1.5:3
Normal reinforced concrete work 1:2:4
Mass unreinforced concrete work 1:2.5:5
Rough concrete work 1:3:6
290 Concrete work
Concrete mixes (per m3) Mix Cement Sand Aggregate Water
t m3 m3 litres
1:1.5:3 0.37 0.50 0.80 185
1:2.5:5 0.25 0.55 0.85 166
Grade
20/20 0.32 0.62 1.20 170
25/20 0.35 0.60 1.17 180
30/20 0.80 0.59 1.11 200
7/40 all-in 0.18 - 1.95 150
20/20 all-in 0.32 - 1.85 170
25/20 all-in 0.36 - 1.75 180
Steel bar reinforcement
Diameter Nominal weight Length Sectional area mm kg/m m/tonne mm 2
6 0.222 4505 28.30 8 0.395 2532 50.30
10 0.616 1623 78.50 12 0.888 1126 113.10 16 1.579 633 201.10 20 2.466 406 314.20
Diameter mm
25 32 40 50
Ref.