Today we are going to learn about types of defects in bricks.Brick is mainly used for taking compressive load acting on the structure.The major component of brick is clay.We have discussed about types and properties of clay used in the brick.To acquire sufficient strength we have to take precaution against involvement of defects in bricks.
Today we are going to learn about types of defects in bricks
Types of Defects in Bricks
1.Over burning of Bricks
We know that,clay is used for the production of bricks.For the production of brick,we have to change the nature of clay from loosen state to harden state by heating.
During the production of bricks,we have to burnt bricks to achieve sufficient hardness after moulding clay into a required shape.During heating,if the brick overburnt,then soft molten mass is produced and the brick looses its required shape.
To know about different shapes of bricks read this article.
2.Under Burning of bricks
Another defect in bricks is due to underburning of bricks. This causes non softening of clay, it could not complete the vitrification process. The result of underburning of clay is a less compressive strength.
If the clay contains bituminous particles, creates black core. The bituminous matter cannot be completely removed by oxidation
This type of defects in bricks is caused during the absorption of moisture present in the surroundings. If the brick contains alkaline nature. During the contact of moisture with brick, the alkaline substance absorbs moisture. During drying small powder patches will appear on the surface of the brick. Efflorescence will effect in the deterioration of plasterings.
The deterioration of bricks caused by falling of rain fall on the bricks is called chuffs.
Iron sulphide in the brick causes dark surface spots in the surface of bricks.
They are caused due the entrapping of air in the void space of the clay.