Calculation of Materials

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Calculation of Materials

a)  For 1 m 3  of concrete Mix 1:2:4 (M15)
Add 50% for wet concrete = 1.50 m3
= 1.50/(1+2+4)  = 0.214 m 3 
For 1 m 3  = 30 bags of cement required (1440/50) say 30 bags
Cement  =          0.214 x 30 = 6.42 bags
Sand      =          0.214 x 2 = 0.428 m 3 
Aggregate       =          0.214 x 4 = 0.856 m 3   

b)  Wall plastering in CM 1:4 of 12 mm thick for 100 m 2 :-

Volume  = 100 x (12/1000)       = 1.20 m 3 
Add 30 to 35% as bulking of sand     = 0.36 m 3 
Add 20 as wastage of sand       = 0.312 m 3 
      Total     = 1.872 m 3 
      = (1.872/1+4)    =          0.374 m 3 
      Cement    =          0.374 x 30       = 10.77 bags
      Sand        =          0.374 x 4         = 1.496 m 3 

c)  For 100 m 3  of solid Block masonry in CM 1:6 mix 8” thick:-

Volume  = 100 x 0.2 (Thickness of wall)
    = 20 m 3 

No. of blocks required    = 20/(0.4 x 0.2 x 0.2)
          = 12502 No’s

Volume of mortar           = 20-{0.39 x 0.19 x 0.19 x 1250}
          = 20 – 17.598
          = 2.40 m 3 

Note: 200mm – 10 mm for mortar thickness = 190 mm

Blocks         =17.598/(0.4 x 0.2 x 0.2)
          =1100 No’s
    Add 2% wastage         = 22
        Total   = 1122 No’s

Increase by 25% for dry mortar         = 3 M 3
          = 3/ (1+6)
          = 0.429 M 3 
Cement        = 0.429 x 30 = 12.50 bags
Sand            = 0.429 x 6   = 2.57 M 3             
Blocks         =1122 No’s
STEEL:-
   Weight of rod per meter length          = d 2  / 162 where d in mm
 “L” for column main rod in footing is minimum of 300mm
  Hook for stirrups is 9D for one side
  For Cantilever anchorage length for main steel is 69D
  No. of stirrups = (clear span/Spanning) + 1
  Design strength is M 40, target strength is 1.25 x 40 = 50 Mpa

TRAPEZOIDAL FOOTING FORMULA:- 
Volume, V = (L x B x D) = H/3{A1 + A2 + sq.rt (A1+A2)}
   Where  A1 = L x B      
    A2 = l x b  B
    H   = D-d (Overall depth of footing – depth of 
             Rectangular footing)

THEROTICAL WEIGHT:-

Cement  =          1440 Kg/m 3 
Steel      =          7850 Kg/m 3 
Bricks    =          1600 – 1920 Kg/m 3 
1 HP      =          745.7 watts    
WEIGHT OF ROD PER METER LENGTH:-

DIA      WEIGHT PER METER
6mm      =          0.222
8mm      =          0.395
10mm    =          0.616
12mm    =          0.888
16mm    =          1.578
20mm    =          2.466
25mm    =          3.853
32mm    =          6.313
40mm    =          9.865

CMENT REQUIREMENTS:-

M10    :           210 Kg
M20    :           320 Kg
M25    :           340 Kg
M30    :           380 Kg
M35    :           410 Kg
M40    :           430 Kg
M45    :           450 Kg
M50    :           450 + M.S 7.5%
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