CIVIL SITE ENGINEERS DATA
CONCRETE GRADE:
Normal Grades of Concrete-
- M5 = 1:4:8
- M10 = 1:3:6
- M15 = 1:2:4
- M20 = 1:1.5:3
- M25 = 1:1:2
- M30, M35, M40, M45 (Design mix)
High Strength Concrete grades-
- M50, M55, M60, M65, M70 (Design mix)
CLEAR COVER TO MAIN REINFORCEMENT:
- Footings..................................50 mm
- Raft Foundation top................50 mm
- Raft Foundation bottom..........75 mm
- Strap Beam..............................50 mm
- Grade Slab...............................20 mm
- Columns..................................40 mm
- Shear Wall...............................25 mm
- Beams......................................25 mm
- Slabs........................................15 mm
- Flat Slab..................................20 mm
- Stair case.................................15 mm
- Retaining Wall........................20/25 mm on earth
- Water Retaining Structures.....20/30 mm
WEIGHT OF ROD PER METER LENGTH (Dia. weight per meter):
- 6 mm = 0.222 Kg
- 8 mm = 0.395 Kg
- 10 mm = 0.616 Kg
- 12 mm = 0.888 Kg
- 16 mm = 1.578 Kg
- 20 mm = 2.466 Kg
- 25 mm = 3.853 Kg
- 32 mm = 6.313 Kg
- 40 mm = 9.865 Kg
UNIT CONVERSIONS:
- 1 feet = 0.3048 m
- 1 m = 3.28 ft
- 1 sqm = 10.76 sq.ft
- 1 cum = 35.28 cu.ft
- 1 acre = 43560 sq.ft
- 1 cent = 435.6 sq.ft
- 1 hectare = 2.47 acre
- 1 acre = 100 cent
- 1 ground = 2400 sq.ft
- 1 unit = 100 cu.ft
DESIGN MIX:
M10 (1:3.92:5.62)
- Cement = 210 Kg/m3
- 20 mm Jelly = 708 Kg/m3
- 12.5 mm Jelly = 472 Kg/m3
- River Sand = 823 Kg/m3
- Total Water = 185 Kg/m3
- Fresh concrete density = 2398 Kg/m3
M20 (1:2.48:3.55)
- Cement = 320 Kg/m3
- 20 mm Jelly = 683 Kg/m3
- 12.5 mm Jelly = 455 Kg/m3
- River Sand = 794 Kg/m3
- Total Water = 176 Kg/m3
- Admixture = 0.7 %
- Fresh concrete density = 22430 Kg/m3
M25 (1:2.28:3.27)
- Cement = 340 Kg/m3
- 20 mm Jelly = 667 Kg/m3
- 12.5 mm Jelly = 445 Kg/m3
- River Sand = 755 Kg/m3
- Total Water = 185 Kg/m3
- Admixture = 0.6 %
- Fresh concrete density = 2414 Kg/m3
- Note: Sand 755 + 20% moisture, water 185-20.5 = 164 Liters, Admixture = 0.5% is 100 ml
M30 (1:2:2.87)
- Cement = 380 Kg/m3
- 20 mm Jelly = 654 Kg/m3
- 12.5 mm Jelly = 436 Kg/m3
- River Sand = 760 Kg/m3
- Total Water = 187 Kg/m3
- Admixture = 0.7 %
- Fresh concrete density = 2420 Kg/m3
- Note: Sand = 760Kg with 2% moisture (170.80+15.20)
M35 (1:1.79:2.57)
- Cement = 410 Kg/m3
- 20 mm Jelly = 632 Kg/m3
- 12.5 mm Jelly = 421 Kg/m3
- River Sand = 735 Kg/m3
- Total Water = 200 Kg/m3
- Admixture = 0.7 %
- Fresh concrete density = 2400 Kg/m3
- Note: Sand = 735+2%, Water = 200-14.7 = 185.30
M40 (1:1.67:2.39)
- Cement = 430 Kg/m3
- 20 mm Jelly = 618 Kg/m3
- 12.5 mm Jelly = 412 Kg/m3
- River Sand = 718 Kg/m3
- Water Cement Ration = 0.43
- Admixture = 0.7 %
- Note: Sand = 718+ Bulk age 1%
M45 (1:1.58:2.26)
- Cement = 450 Kg/m3
- 20 mm Jelly = 626 Kg/m3
- 12.5 mm Jelly = 417 Kg/m3
- River Sand = 727 Kg/m3
- Water Cement Ration = 0.43
- Admixture = 0.7 %
- Note: Sand = 727+ Bulk age 1%
M50 (1:1.44:2.23)
- Cement = 450 Kg/m3
- 20 mm Jelly = 590 Kg/m3
- 12.5 mm Jelly = 483 Kg/m3
- River Sand = 689 Kg/m3
- Water Cement Ration = 0.36
- Admixture = 1.20%
- Micro silica = 30 Kg
- Super flow = 6.7 % of cement
- Note: Sand= 689 + Bulk age 12%
UNIT WEIGHT OF MATERIALS:
- Concrete = 2400 Kg/m3
- Brick = 1600 Kg/m3
- Steel = 7850 Kg/m3
- Water = 1000 Lt/m3
- Cement = 1440 Kg/m3
- Cement mortar = 2000 Kg/m3
- Aggregate = 1750 Kg/m3
- R.C.C. = 2500 Kg/m3
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