HOW TO CHECK QUALITY OF BRICK AT SITE


Bricks will take place major parts of the building . If the quality of brick is worst , then it can cause serious damage to whole parts of the building . Therefore it is necessary to check the minimum quality of brick before using of construction. there some simple field tests that we can conduct in the field in order to check the quality of brick 

THE FOLLOWING TESTS ARE

1. Water absorption test
2. Size colour and shape
3. Dimension
4. Hardness
5. Soundness
6. Structure 
7. Efflorescence test

WATER ABSORPTION TEST

For the proposer of find out the water absorption test. Taken for five procurement bricks . Then weight it in dry condition and the average dry weight is calculated.

Then immerse this five bricks into water for 24 hours. After 24 hours taken it out and weight it again in wet condition and calculate the average weight of five bricks. 

The difference between average weights of the of wet bricks to the dry brick Indicate the water absorption of brick . The water absorption does not exceed 20 % of weight of dry brick .

If the brick tend to absorb more water than its limits. it will cause decrease the strength of mortar because the brick absorb water from mortar.

SIZE COLOUR AND SHAPE.



The colour of well burnt brick is red or copper . other than this two colors that bricks are over burnt or under burnt . So this bricks are not used for any construction works.

Size of brick is uniform does not bulk in any sides. More bulk need more mortar so the cost of construction is exceed actual cost.

DIMENSION 



Edges of bricks should be sharp. Variation in dimensions are allowed only with this limit +- 3 % tolerance for first class and +,- 8 % tolerance of second and third class bricks.

HARDNESS AND SOUNDNESS



Good quality brick so hard. In this test just scratch a brick with your finger nail .if the brick is good then there is no impression on the brick.



Struck one brick to another brick. if a good brick make clear ring sound. Otherwise the quality of brick is low.



Take  a brick and drop it above the hard floor from 1.2 m to 1.5 m height . if the brick is  good then the brick not break.

EFFLORESCENCE 



If sodium and potassium salts are presence in the brick this will cause white patches on the brick surface that is called efflorescence.

 Brick production soil should be free from sulphate, potassium and sodium . When bricks are contact to water this sale dissolved and this will cause major defects on plastering surface. So this bricks are not allowed for construction.

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