Unit weight of construction materials- How to calculate it?


What is Unit weight of construction materials?

The ratio of the weight of a material to its volume is known as the unit weight of that materials. Sometimes it is termed specific weight or weight density. It is denoted by (y) Gama.

Unit weight of construction materials- How to calculate it?

If you want to calculate the unit weight of materials then you have to take unit volume of materials and its weight.

As we know that the volume is expressed in the terms of liters or  m3 and weight is measured in terms of Kg or KN. So, Unit weight can be expressed in Kg/L or  KG/m3 or KN/m3 .

The formula of unit weight is given below;

Read Also, Easy way to calculate unit weight of steel rod

Why we need the unit weight of different constructional materials?

  1. To estimate the total cost and materials as per volume.
  2. Unit weight let us know how heavy is the materials.
  3. The unit weight helps to calculate the total load which will be acted on the structure.
  4. The unit weight helps to calculate the dead load and live load on the structure.
  5. It helps to know the different characteristics of materials like permeability, compactness, etc.

There are many materials which are used in construction. The table below shows the Unit weight of construction materials which is commonly used in the construction sites.

Unit weight of construction materials

MaterialUnit weight
Water980 Kg/m3
Bricks ( common )1600 Kg/m3
Bricks ( broken )1420 Kg/m3
Cement ( ordinary)1440 Kg/m3
Cement (rapid hardening)1250 Kg/m3
Cement concrete (reinforced)2500 Kg/m3
Cement concrete (plain)2400 Kg/m3
Cement mortar2000 Kg/m3
Lime concrete1900 Kg/m3
Cement plaster2000 Kg/m3
Lime plaster1700 Kg/m3
Glass2500 Kg/m3
Stones ( ballast)1720 Kg/m3
Stone (basalt)2850 Kg/m3
Stone (granite)2450 Kg/m3
Stone (aggregates)1750 Kg/m3
Stone (marble)2650 Kg/m3
Timber (Oak, sal)510 Kg/m3
Timber (teak)625 Kg/m3
Timber (mango)650 Kg/m3
Coal600 Kg/m3
Plastics1250 Kg/m3
Ashes650 Kg/m3
Clinker750 Kg/m3
Oils800 Kg/m3
Rubber1300 Kg/m3
Slag1500 Kg/m3
Clay soil1900 Kg/m3
Sand (wet)1760 to 2000 Kg/m3
Sand ( dry)1540 to 1600 Kg/m3
Steel7850 Kg/m3
chalk2100 Kg/m3
Bitumen1040 Kg/m3
Gravel2000 Kg/m3
Sedimentary rock2600 Kg/m3
Igneous rock2700 to 3000 Kg/m3
Metamorphic rock2700 Kg/m3
Mud1600 to 1920 Kg/m3
Alcohol780 Kg/m3
Gasoline670 Kg/m3
Ice910 Kg/m3
Graphite500 Kg/m3
Rubber1300 Kg/m3

I hope this article remains helpful for you.

Happy Learning – Civil Concept

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