Red Brick. Red colored brick is the most common color you can find in residential as well as commercial building projects. The red color comes from the type of clay that brick is made from, which contains red iron oxide. Not all, but most bricks contain variations of red within them.
Engineering bricks were traditionally used in civil engineering; the bricks were useful for damp courses and structural design. A common type of engineering brick is the Accrington brick; it is an iron hard engineering brick that was famously used for the foundations of the Empire State Building.
Of course Fly ash bricks! Fly ash bricks are frequently used for different types of construction purposes and it's often preferred due to their strength and moisture resistant features. These bricks are made from fly ash residue which is created when specimens of coal are burned for producing electricity.
Soundness test of bricks shows the nature of bricks against sudden impact. In this test, 2 bricks are chosen randomly and struck with one another. Then sound produced should be clear bell ringing sound and brick should not break. Then it is said to be good brick.
Compressive strength test on bricks are carried out to determine the load carrying capacity of bricks under compression. This test is carried out with the help of compression testing machine. Bricks are generally used for construction of load bearing masonry walls, columns and footings.