Useful Notes for Civil Engineers

CONCRETE GRADE:

M5 = 1:4:8

M10= 1:3:6

M15= 1:2:4

M20= 1:1.5:3

M25= 1:1:2

CLEAR COVER TO MAIN REINFORCEMENT:

1.FOOTINGS : 50 mm

2.RAFT FOUNDATION.TOP : 50 mm

3.RAFT FOUNDATION.BOTTOM/SIDES : 75 mm

4.STRAP BEAM : 50 mm

5.GRADE SLAB : 20 mm

6.COLUMN : 40 mm

7.SHEAR WALL : 25 mm

8.BEAMS : 25 mm

9.SLABS : 15 mm

10.FLAT SLAB : 20 mm

11.STAIRCASE : 15 mm

12.RET. WALL : 20/ 25 mm on earth

13.WATER RETAINING STRUCTURES : 20/30 mm

WEIGHT OF ROD PER METER LENGTH:

DIA WEIGHT PER METER

6mm = 0.222Kg

8mm = 0.395 Kg

10mm = 0.616 Kg

12mm = 0.888 Kg

16mm = 1.578 Kg

20mm = 2.466 Kg

25mm = 3.853 Kg

32mm = 6.313 Kg

40mm = 9.865 Kg

1bag cement-50kg

1feet-0.3048m

1m-3.28ft

1sq.m-10.76sq.ft

1cu.m-35.28cu.ft

1acre-43560sq.ft

1cent-435.6sq.ft

1hectare-2.47acre

1acre-100cent-4046.724sq.m

1ground-2400sq.ft

1unit-100cu.ft- ¬2.83cu.m 1square-100sq.f ¬t

1 M LENGTH STEEL ROD I ITS VOLUME

V=(Pi/4)*Dia x DiaX L=(3.14/4)x D x D X 1 (for

1m length) Density of Steel=7850 kg/ cub meter

Weight = Volume x Density=(3.14/4)x D x D X

1×7850 (if D is in mm ) So = ((3.14/4)x D x D X

1×7850)/(1000×1000) = Dodd/162.27

DESIGN MIX:

M10 ( 1 : 3.92 : 5.62)

Cement : 210 Kg/ M 3

20 mm Jelly : 708 Kg/ M 3

12.5 mm Jelly : 472 Kg/ M 3

River sand : 823 Kg/ M 3

Total water : 185 Kg/ M 3

Fresh concrete density: 2398 Kg/M 3

M20 ( 1 : 2.48 : 3.55)

Cement : 320 Kg/ M 3

20 mm Jelly : 683 Kg/ M 3

12.5 mm Jelly : 455 Kg/ M 3

River sand : 794 Kg/ M 3

Total water : 176 Kg/ M 3

Admixture : 0.7%

Fresh concrete density: 2430 Kg/ M 3

M25 ( 1 : 2.28 : 3.27)

Cement : 340 Kg/ M 3

20 mm Jelly : 667 Kg/ M 3

12.5 mm Jelly : 445 Kg/ M 3

River sand : 775 Kg/ M 3

Total water : 185 Kg/ M 3

Admixture : 0.6%

Fresh concrete density: 2414 Kg/ M 3

Note: sand 775 + 2% moisture, Water185 -20.5 =

164 Liters,

Admixture = 0.5% is 100ml

M30 ( 1 : 2 : 2.87)

Cement : 380 Kg/ M 3

20 mm Jelly : 654 Kg/ M 3

12.5 mm Jelly : 436 Kg/ M 3

River sand : 760 Kg/ M 3

Total water : 187 Kg/ M 3

Admixture : 0.7%

Fresh concrete density: 2420 Kg/ M 3

Note: Sand = 760 Kg with 2% moisture

(170.80+15.20)

M35 ( 1 : 1.79 : 2.57)

Cement : 410 Kg/ M 3

20 mm Jelly : 632 Kg/ M 3

12.5 mm Jelly : 421 Kg/ M 3

River sand : 735 Kg/ M 3

Total water : 200 Kg/ M 3

Admixture : 0.7%

Fresh concrete density: 2400 Kg/ M 3

Note: sand = 735 + 2%, Water = 200- 14.7 =

185.30,

Admixture = 0.7%

M40 ( 1 : 1.67 : 2.39)

Cement : 430 Kg/ M 3

20 mm Jelly : 618 Kg/ M 3

12.5 mm Jelly : 412 Kg/ M 3

River sand : 718 Kg/ M 3

Water Cement ratio : 0.43

Admixture : 0.7%

Note: Sand = 718 + Bulk age 1%

M45 ( 1 : 1.58 : 2.26)

Cement : 450 Kg/ M 3

20 mm Jelly : 626 Kg/ M 3

12.5 mm Jelly : 417 Kg/ M 3

River sand : 727 Kg/ M 3 + Bulk age 1%

Water Cement ratio : 0.43

Admixture : 0.7%

M50 ( 1 : 1.44 : 2.23)

Cement : 450 Kg/ M 3

20 mm Jelly : 590 Kg/ M 3

12.5 mm Jelly : 483 Kg/ M 3

River sand : 689 Kg/ M 3 + Bulk age 12%

Water Cement ratio : 0.36 (188 Kg)

Admixture : 1.20%3

Micro silica : 30 Kg

Super flow 6.7% of cement

1 cubic meter contains 500 bricks

The Standard size of the 1st class brick is 190mm

x 90mm x

90mm and motor joint should be 10mm thick

So brick with motor=200 x 100 x 100.

Volume of 1st class brick = 0.19 x 0.09 X 0.09 =

0.001539

cu.m

Volume of 1st class brick with motor =0.2 x 0.1 x

0.1=0.002

cu.m

No. on bricks per 1cu.m= 1/volume of1st class

brick with

motor

=1/0.002

= 500 no’s of bricks

STANDARD CONVERSION FACTORS

INCH = 25.4 MILLIMETRE

FOOT = 0.3048 METRE

YARD = 0.9144 METRE

MILE = 1.6093 KILOMETER

ACRE = 0.4047 HECTARE

POUND = 0.4536 KILOGRAM

DEGREE FARENHEIT X 5/9 – 32 = DEGREE

CELSIUS

MILLIMETRE= 0.0394 INCH

METRE = 3.2808FOOT

METRE = 1.0936YARD

A rope having length 100cm.You can form any

shape using this rope (Example: Triangle,

Rectangle, etc.,). Which shape will covers

maximum area

1 Newton = o.101971 kg

1 mm2 = 0.01 cm2

1 cm2 = 100 mm2

1 mm2 = 20 N

100 mm2 = 2000N

1 cm2 = 2000N

2000 N = 203.942 kg

So 20 N/ mm2 = 203.942 kg / cm2

RATIO IS 1:1.5:3

then volume is 1+1.5+3=5.5 and the total volume

for using mix=1.57 m3 then cement required=1/

5.5*1.57=0.285m3*1440=411 kg. (8+bag)

sandrequried=1.5/5.5*1.57=0.471m3

aggregaterequired=3/5.5*1.57=0.853m3

the standard volume of dry mix mortar=1.57.. U

can check it in IS code also. Then volume is

1+1.5+3=5.5 and the total volume for using

mix=1.57 m3 then cement required=1/

5.5*1.57=0.285m3*1440=411 kg.(8+bag)

sandrequried=1.5/5.5*1.57=0.471m3

aggregaterequired=3/5.5*1.57=0.853m3

the standard volume of dry mix mortar=1.57.. U

can check it in IS code also.

MATERIAL CALCULATION:

CEMENT IN BAGS

01. PCC 1:5:10 1440/5*0.45 129.60Kg 2.59

02. PCC 1:4:8(M 7.5) 1440/4*0.45 162.00Kg 3.24

03. PCC 1:2:4(M 15) 1440/2*0.45 324.00Kg 6.48

04. PCC 1:3:6(M 10) 1440/3*0.45 216.00Kg 4.32

05. RCC 1:2:4(M 15) 144/2*0.45 324.00Kg 6.48

06. RCC 1:1.5:3(M 20) 1440/1.5*0.45 32.00Kg

8.64

07. RCC 1:1:2(M 25) 370.00Kg 7.40

08. RCC M 30 410.00Kg 8.20

09. RCC M35 445.00Kg 8.90

10. RCC M40 480.00Kg 9.60

11. Damp Proof Course

CM1:3,20mm tk 1440/3*0.022 10.56Kg 0.21

12. 2″tk precast slab M15 324*0.05 16.20Kg 0.32

13. 3″tk precast slab M15 324*0.075 24.30Kg

0.49

14. GC Masonry CM 1:7 1440/7*0.34 70.00Kg

1.40

15. Brick Work CM 1:6 1440/6*0.25 60.00Kg 1.20

16. Brick Work CM 1:4, 115tk 1440/4*0.25*0.115

10.35Kg 0.21

17. Grano Flooring CC 1:1.5:3 1440/1.5*0.45*0.05

21.60Kg 0.43

18. Plastering CM 1:3, 12mm tk 1440/3*0.014

6.72Kg 0.13

19. Wall Plastering CM 1:4,

12mm tk 1440/4*0.014 5.00Kg 0.10

20. Laying Pressed Tiles Over

a CM 1:4, 20mm tk 1440/4*0.022 7.92Kg 0.16

21. Ceramic Tiles, Marble,

Granite, Caddapah Slab

CM 1:4, 20mm tk 1440/4*0.022 7.92Kg 0.16

22. Hollow Block Masonry

CM 1:6, 200mm tk/m¬2¬ 10.00Kg 0.20

SAND CALCULATION (CFT):

01. Any Concrete Work

(PCC, RCC) 0.45*35.315= 20.00

02. Damp Proof Course

CM `1:3, 20mm tk 1.00

03. 2″tk Precast slab M15 1.00

04. 3″tk Precast slab M15 1.50

05. SS Masonry in CM 1:7 15.00

06. Brick Work in CM 1:6 15.00

07. Brick Work in CM 1:4,115mm tk 2.00

08. Grano Flooring in CC 1:1.5:3 1.00

09. Plastering in CM 1:3, 12mm tk 1.00

10. Wall Plastering CM 1:4, 12mm tk 1.00

11. Laying Pressed Tiles over a CM 1:4, 20mm tk

1.00

12. Ceramic Tiles, Marble, Granite, Cuddapah slab

CM 1:4, 20mm tk 1.00

METAL CALCULATION:

01. Any Concrete Work 32.00 cft

02. Grano Flooring in CC 1:1.5:3, 50mm tk 1.60

cft

03. Grano Flooring in CC 1:1.5:3, 75mm tk 2.40

cft

04. Grano Flooring in CC 1:1.5:3, 100mm tk 3.20

cft

05. Bricks/cum 450.00 Nos

06. Size Stone/ cum 90.00 Nos

07. Rough Stone 10.00 cft

08. Bond Stone/ cum 10.00 Nos

09. Cement Paint/100 Sft 2.00 Kg

10. White Cement/100 Sft 2.00 Kg

11. Janathacem/100 Sft 1.50 Kg

12. Enamel Paint/100 Sft – 2 Coats 1.25 Litre

13. Wall Putty/100 Sft 10.00 Kg

14. Plaster of Paris/100 Sft 25.00 Kg

15. Distember/100 Sft 2.00 Kg

16. Cement Primer 0.60 Litre

0.40 Litre

17. Weathering Course

Lime 12.50 Kg

Brick bats 32.00 Kg

18. Providing Sand Gravel Mix- Cum

Sand 20.00 Cft

Gravel 40.00 Cft

19.WBM – 75mm tk – 1st Layer – 10 Sqm

Metel(60-40 mm) 35.00 Cft

Gravel 10.00 Cft

20. Pressed Tiles – Sqm 20.00 Nos

21. Hollow Block – 200mm tk 14.00 Nos

CONVERSION TABLE:

01. 1 RM 3.28 Rft

02. 1 Sqm 10.76 Sft

03. 1 Cum 35.32 Cft

04. 1 Inch 2.54 cm

05. 1 sft 0.09Sqm

06. 1 Acre 0.04 Hectare

07. 1 Hectare 2.47 Acres

08. 1 Cft 0.028 Cum

09. 1 Feet 12.00 Inch

10. 1 Feet 0.305 M

11. 1 Cum 1000.00 Litre

UNIT WEIGHT:

01. Concrete 25 kN/m3

02. Brick 19 kN/m3

03. Steel 7850 Kg/m3

04. Water 1000 Lt/m3

05. Cement 1440 Kg/m3

06. 1Gallon 4.81 Litres

07. Link 8″ = 200mm

08. 1 Hectare 2.471 acr(10000m2)

09. 1 Acr 4046.82m2 = 100 cent

DEVELOPMENT LENGTH:

01. Compression 38d

02. Tension 47 & 60d

03. 1 Cent 435.60 Sft

04. 1 Meter 3.2808 ft

05. 1 M2 10.76 ft2

06. 1 Feet 0.3048m

07. 1 KN 100Kg

08. 1kN 1000N

09. 1 Ton 1000Kg = 10,000 N = 10 kN

10. 1 kG 9.81N

M5=2.54Bg/m3, M7.5=3.18Bg/m3, M10=4.32Bg/

m3,

M20=8.64Bg/m3, M25=12.9 Bg/m3,

M40=500+100Kg/m3

1m3 Conrete = 0.9 m3 Jelly + 0.55 m3 Sand +

0.225 m3

BRICK:

Weight = 3.17 – 3.80 Kg

Water absorption 12 to 15%

Compressive strength = 36Kn/cm2

230mm Wall/m3 = 460 Bricks + 20Cft Sand +

66Kg Cement

SSM 1:7/m3 = Slize 95 + Soiling 8 Cft +60.5 Kg

Current = 1000 Watts = 1 Unit, 25Watt*40Hr = 1

Unit

Sunshade = 65mm – 0.56 bag/m2,

= 90mm – 0.78