All about civil construction knowledge- PARAM VISIONS

Calculating the quantity of materials in 1 cum. & 1cuft. of plastering mortar in different mix ratios.

 Let us consider a 1 cum. of plastering mortar in a 1:4 ratio 

The wet volume of the mortar = 1 cum.

Dry volume of the plaster mortar 

    = 1.33 × wet volume

    = 1.33 × 1 cum.

    = 1.33 cum.


The volume of cement required

   = dry volume of plaster mortar ×  (ratio of cement  ÷ total ratio)

   = 1.33 cum ×  ( 1 ÷ (1+4 ))

  = 1.33 × 0.2

  = 0.266 cum.

 = 9.393 cu ft.


As you know, the density of cement = 1440kg/cum.

So, the total quantity of cement required in kgs.

   = 0.266 × 1440

   = 383.04 kg

One bag of cement weighs 50kg 

The number of cement bags required

  = 383.04 ÷ 50

  = 7.66 bags.


The volume of sand required

  = dry volume of plaster mortar ×  (ratio of sand  ÷ total ratio)

  = 1.33 cum ×  ( 4 ÷ (1+4 ))

  = 1.33 × 0.8

  = 1.064 cum.

  = 37.575 cu.ft.

   ( 1cu.m = 35.315 cu.ft. )

        or

Volume of sand

   = volume of cement × 4

   = 0.266 cum.× 4

  = 1.064 cum.

          or

Volume of sand

    = total dry volume- the volume of cement

    = 1.33 cum - 0.266 cum

    =1.064 cum.


Density of dry sand = 1602 kg/cum.

Weight of sand required

= 1.064 cum × 1602 kg/cum

= 1704.528 kg.


Quantity of water required

  = weight of cement × w/c ratio

  = 383.04kg × 0.6 

  = 229.82 kg i.e. 229.82 liter.

Note: Water is mixed depending upon the consistency required for the plastering. If you use plasticizers the requirement for water reduces. 


Now we will consider plaster mortar in a 1:6 ratio.


The volume of cement required

  = 1.33 cum ×  ( 1 ÷ (1+6 ))

  = 1.33 × 0.14285

  = 0.19 cum.

 = 6.709 cu ft.


The total quantity of cement required in kgs.

   = 0.19 × 1440

   = 273.6 kg


One bag of cement weighs 50kg 

The number of cement bags required

     = 273.6 ÷ 50

    = 5.472 bags.


Volume of sand

     = volume of cement × 6

     = 0.19 cum.× 6

    = 1.14 cum.


Weight of the sand

    = 1.14 cum. × 1602 kg /cum.

    = 1826.28 kg.


 To get the quantity of materials for 1 cu ft. of plastering mortar, you have to replace the unit cum. from cu ft. 


sl.no.  particulars mix ratio cement     sand         cement
                                                         in cu ft.    in cu ft.     in bags
 1          plaster               1: 4           0.266         1.064       0.217 
             mortar

  2                                     1: 6             0.19           1.14          0.155          

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