HOW TO CALCULATE MATERIALS REQUIRED

 CALCULATION OF MATERIALS

 FOR CONCRETE

For  Concrete Mix 1:2: 4 (M15) -1 Cum

Add 50% for Wet Concrete, ie., 1.5 Cum    (1.54 also can be taken)

Cement -1 part = 1.5/ (1+2+4)  = 0.214 Cum

                     1 Cum of Cement = 30 Bags of Cement  ( 1 Cum = 1440 Kg /50 = 30bags)

Cement required      = 0.214 x 30 = 6.42 bags

Sand required            = 0.214 x 2 = 0.428 Cum

Aggregate required = 0.214 x 4 = 0.856 Cum

FOR SOLID BLOCK MASONRY 8" tk. in CM 1:6 mix - 100 Sqm

Volume = 100 x 0.2 (Thickness of wall)   Block size - 0.4 x 0.2 x 0.2

                 =  20 Cum

Approx. no. of blocks required  = 20 / (0.4 x 0.2 x 0.2)

                                               = 1250 Nos.

Volume of Mortar          = 20-(0.39 x 0.19 x 0.19 x 1250)   (Deduct 10mm for mortar thickness)

                                              = 20 - 17.598

                                              = 2.40 Cum

Blocks                                 = 17.598 / (0.4 x 0.2 x 0.2)

                                               = 1100 Nos.

        Add 2% wastage     = 22

Total Blocks required   = 1122 Nos.

FOR WALL PLASTERING CM 1:4, 12 mm tk. - 100 Sqm

Volume              = 100 x (12/1000)          = 1.20 Cum

Add 30 - 35% as bulking of Sand        = 0.36 Cum

Add 20% wastage of Sand                     = 0.312 Cum

                                                  Total              = 1.872 Cum

 For 1: 4 mix, 1 part     = 1.872 / (1+4)  = 0.374 Cum

 Cement required        = 0.374 x 30       = 10.77 bags

Sand required               = 0.374 x 4         = 1.496 Cum

Mortar - increase 25% for dry mortar  = 2.4 + 0.6 = 3.0 Cum   (Upto 33% can be increased)

                                         For 1: 6 mix            = 3 / (1+6)

                                                                            = 0.429 Cum

               Cement Required   = 0.429 x 30 = 12.50 bags

                Sand                           = 0.429 x 6   = 2.57 Cum

FOR RED CLAY BRICK MASONRY 9" tk. in CM 1:6 mix - 100 Sqm

Size of Bricks (Traditional in India) - 225 x 112.5 x 75 incl. 10mm mortar joint.

Volume = 100 x 0.225 (Thickness of wall)   

                 =  22.5 Cum

Approx. no. of bricks required  = 22.5 / (0.225 x 0.1125 x 0.075)

                                               = 11852 Nos.

Volume of Mortar          = 22.5-(0.215 x 0.1025 x 0.065 x 11852)   (Deduct 10mm for mortar thickness)

                                              = 22.5 - 16.98

                                              = 5.52 Cum

Bricks                                 = 16.98 / (0.225 x 0.1125 x 0.075)

                                               = 8944 Nos.

        Add 2% wastage     = 179

Total Bricks required   = 9123 Nos. For 100 Sqm 9" tk. wall

CONVENTIONAL METHOD OF CALCULATION OF BRICKS

Size of Brick - 9" x 4.5" x 3" (0.75 x 0.375 x 0.25 ft)

Volume of Brick  = 0.75 x 0.375 x 0.25 = 0.07 Cft.

No. of Bricks in 1Cft. = 1 / 0.07 =14.285 Bricks

Quantity of Bricks without mortar = 14.285 - 1.4285  (Deduct 10% for mortar coverage)

                                                                       = 12.856 Bricks

Adding 5% wastage of Bricks            = 0.6428

                   Total no of bricks                 = 13.49 for 1 Cft of Brick work

                For 100 Cft Brick work           = 1349 Bricks

CALCULATION OF AGGREGATES

For 1:1.5:3 mix

Quantity of Aggregate  = Aggregate / (Cement+ Sand + Aggregate ) x 1.57

                                               = 3/ (1+1.5+3) x 1.57   = 0.85 Cum

! Cum of Aggregate        = 1500 to 1800 Kg 

  Let us assume 1650 Kg, Then 0.85 Cum Aggregate = 1650 x 0.85 = 1402.5 Kg.