# PARAM VISIONS

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 × 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