how to calculate quantity of cement mortar in plastering and what is plastering work and its type and How to calculate quantity cement mortar in plaster and also cement mortar calculation for plastering.

## **What is plastering ?**

Plastering is a thin layer of mortar applied over the rough surface of brick wall and it acts as “damp proof coat” over the brick work .plastering also provide fine and finish surface over the brick wall that is firm and smooth and it enhances the appearance of of brick wall building.

Plaster work |

### **What is ****thickness of plastering ?**

There is a two types of plastering work first one is internal plastering of brick wall and second one is external plastering of brick wall.

In internal plastering of brick wall plaster thickness is about **12 mm** and in the case of external plastering work of brick wall plaster thickness is about **18 mm to 20 mm**

and also plastering work is done on the RCC slab ,in the case of RCC plastering thickness is about **6 mm.**

** What are ****types of plastering?**

●(1) **lime plaster:- in** the case of lime plaster lime is used as binding material for the plastering work of brick wall

●( 2**) cement plaster**:- in the case of cement plaster cement is used as binding material for the plastering work of brick wall

● **(3) mud plaster :**– in the case of mud plaster mud is used as binding material for the plastering work of brick wall

**calculate the quantity of cement and sand for plastering **

**●Given dimension:-**

Brick wall size = 1 m× 1m

Mortar thickness in the case of internal plaster work t = 12 mm

● **solve:-**

Wet volume of mortar = A× t

Vw = wet volume

Vw = 1m× 1m × 12mm

Vw = 1m2 × 0.012m

Wet volume = 0.012 m3

You know that wet volumes contains water and its bubble it can be remove by pressing the Plaster that’s require more quantity of mortar material mixture of sand and cement ,that is dry volume

hence dry volume is increased by **33% of wet volume . so we have to convert wet volume** in dry volume by conversion factor multiplying 1.33

● dry volume = 1.33×wet volume

Dry volume = 1.33×0.012 m3

Dry volume = 0.01596 m3

**Mix Ratio of cement mortar for plastering**

mix ratio of sand and cement which are used in plastering work of brick wall is 1:6, in this ratio 1 part is cement and 6 part is sand.

Plaster work |

● mix ratio = 1:6

Total R = 1+6 =7

Dry volume =0.01596 m3

#### **Quantity of cement required for plastering**

Weight of cement = volume ×density

Density of cement= 1440 kg/m3

Weight = 1/7×0.01596 m3×1440 kg/m3

Weight of cement =3.28 kg

Some amount of Cement Solution are also used as binding material for plastering work it will be about 25%

Weight of Cement Solution=3.28×25/100

=0.82 kg

Now Total weight of cement required for plastering work= 3.28 kg+ 0.82 kg=4.1kg

4.1 kg of cement is required for for 1 square metre (m2) plastering of brick wall

**Quantity of sand required for 1m2 plastering**

● **quantity of sand in CFT:- in** the mix ratio of mortar 6 part is sand used in plastering work of brick wall

Volume of sand = 6/7×0.01596m3

1 m3 = 35.3147 ft3

Putting this value we get

Volume of sand =6/7×0.01596 × 35.3147 cft

**Quantity of sand =0.483 CFT**

0.483 cuft sand is required for plastering of 1 square metre brick wall

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