How do you Calculate the Number of Bricks per Cubic Meter/SITE VIDEO By Civil Guruji
Channel: Civil Engineers Training Institute
Date: 06/08/2020

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A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term brick denotes a block composed of dried clay, but is now also used informally to denote other chemically cured construction blocks. Bricks can be joined together using mortar, adhesives or by interlocking them.[1][2] Bricks are produced in numerous classes, types, materials, and sizes which vary with region and time period, and are produced in bulk quantities.

Block is a similar term referring to a rectangular building unit composed of similar materials, but is usually larger than a brick. Lightweight bricks (also called lightweight blocks) are made from expanded clay aggregate.

Fired bricks are one of the longest-lasting and strongest building materials, sometimes referred to as artificial stone, and have been used since circa 4000 BC. Air-dried bricks, also known as mudbricks, have a history older than fired bricks, and have an additional ingredient of a mechanical binder such as straw.

Bricks are laid in courses and numerous patterns known as bonds, collectively known as brickwork, and may be laid in various kinds of mortar to hold the bricks together to make a durable structure.
In India, the recommended standard size of an ideal brick is 19 x 9 x 9 cm which with mortar joint gives net dimensions of 20 x 10 x 10 cm.

These dimensions have been found very convenient in handling and making quantity estimates. Five hundred such bricks will be required for completing 1 m3 brick masonry.
These properties of bricks include shape, size, color, and density of a brick.

(i) Shape.
The standard shape of an ideal brick is truly rectangular. It has Well defined and sharp edges. The surface of the bricks is regular and even.

Special purpose bricks may, however, be either cut or manufactured in various other shapes. These are generally modifications of rectangular shapes.

(ii) Size.
The size of brick used in construction varies from country to country and from place to place in the same country
(iii) Color.
The most common color of building bricks falls under the class RED. It may vary from deep red to light red to buff and purple.

Very dark shades of red indicate over burnt bricks whereas yellow color is often indicative of under-burning.

(iv) Density.
The density of bricks or weight per unit volume depends mostly on the type of clay used and the method of brick molding (soft-mud, Stiff-mud, hard-pressed etc.).

In the case of standard bricks, density varies from 1600 kg/cubic meter to 1900 kg/cubic meter.

A single brick (19 x 9 x 9 cm) will weigh between 3.2 to 3.5 kg. depending upon its density.
2) Mechanical Brick Properties.
Under this heading of properties of bricks, compressive strength and flexure strength are included.

(i) Compressive Strength of Bricks.
It is the most important property of bricks especially when they are used in load-bearing walls.

The compressive strength of a brick depends on the composition of the clay and degree of burning. It may vary from 35 kg/cm2 to more than 200 kg/cm2 in India.

It is specified under the I.S.S. codes that an ordinary type building brick must possess a minimum compressive strength of 35 kg/cm2 .

The first and 2nd class bricks shall have a compressive strength not less than 70 kg/cm2 and 140 kg/cm2 respectively.

(ii) Flexure Strength.
Bricks are often used in situations where bending loads are possible in a building. As such, they should possess sufficient strength against transverse loads.

It is specified that the flexural strength of a common building brick shall not be less than 10 kg/cm2.

Best grade bricks often possess flexural strength over 20 kg/cm2.

Similarly, it is required that a good building brick shall possess a shearing strength of 50-70 kg/cm2.

Read More: Reinforced Cement Concrete | Advantages, Uses, Types, & Purpose.

(3) Thermal Properties of Building Bricks.
Besides being hard and strong, ideal bricks should also provide an adequate insulation against heat, cold and noise.

The heat and sound conductivity of bricks vary greatly with their density and porosity.

Very dense and heavy bricks conduct heat and sound at a greater rate. They have, therefore, poor thermal and acoustic (sound) insulation qualities.

For this reason, bricks should be so designed that they are light and strong and give adequate insulation.

(4) Durability.
By durability of bricks, it is understood that the maximum time for which they remain unaltered and strong when used in construction.

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