HISTORY OF BRICKS • Bricks are one of the oldest types of building blocks. • They are an ideal building material because they are relatively cheap to make. • A brick is a block of ceramic material used in masonry construction. • The ﬁrst sun-dried bricks were made in Mesopotamia (what is now Iraq).
Constituents of good brick earth • Bricks are the most commonly used construction material. Bricks are prepared by moulding clay in rectangular blocks of uniform size and then drying and burning these blocks. In order to get a good quality brick, the brick earth should contain the following constituents. • Silica • Alumina • Lime • Iron oxide • Magnesia
Silica • Brick earth should contain about 50 % of silica. • It is responsible for preventing cracking, shrinking and warping of raw bricks. • It also affects the durability of bricks. • If present in excess, then it destroys the cohesion between particles and the brick becomes brittle.