Qualities of Good Bricks | Tests for Bricks | Grading of Bricks
Qualities of Good Brick:
(i) Bricks should be table moulded, well burnt in kilns, copper colored, free from cracks and with sharp and square edges.
(ii) Bricks should be uniform shape and should be of standard size.
(iii) Bricks should give clear ringing sound when struck each other.
(iv) Bricks when broken should show a bright homogeneous and compact structure free from voids.
(v) Bricks should not absorb water more than 20 percent by weight for first class bricks and 22 percent by weight for second class bricks, when soaked in cold water for a period of 24 hours.
(vi) Bricks should be sufficiently hard no impression, should be left on brick surface, when it is scratched with finger nail.
(vii) Bricks should be low thermal conductivity and they should be sound proof.
(viii) Bricks should not break when dropped flat on hard ground from a height of about one meter.
(ix) Bricks, when soaked in water for 24hours, should not show deposits of white salts when allowed to dry in shade.
(x) No brick should have crushing strength below 55kg/cm2
Tests for bricks :
A brick is generally subjected to following tests to find out its
suitability of the construction work.
i. Absorption
ii. Crushing strength or compression strength
iii. Hardness
iv. Presence soluble salts
v. Shape and size
vi. Soundness
vii. Structure
1) Absorption: A good should not absorb not more than 20 percent of weight of dry brick
2) Compressive strength: crushing or compressive strength of brick is found out by placing it in compression testing machine. It is pressed till it breaks. Minimum crushing strength of brick is 35kg/cm2 and for superior bricks, it may vary from 70 to 140 kg/cm2
3) Hardness: No impression is left on the surface the brick is treated to be sufficiently hard
4) Presence of soluble salts: The bricks should not show any grey or white deposits after immerted in water for 24 hours
5) Shape and size: It should be standard size and shape with sharp edges
6) Soundness: The brick should give clear ringing sound struck each other
7) Structure: The structure should be homogeneous, compact and free from any defects
Grading of Bricks
As per IS10719557 and 1970 code specifications,
a) Bricks with compressive strength not less than 140kg/cm2 – Grade A-A class.
b) Bricks with compressive strength not less than 105kg/cm2 – First class bricks - Grade A.
c) Bricks with compressive strength not less than 70kg/cm2 – Second class bricks – Grade B.
d) Bricks with compressive strength not less than the average value 35kg/cm2 – class III bricks – Grade C.
Conclusion:
Full article on Qualities of Good Bricks | Tests for Bricks | Grading of Bricks | Characteristics of Good Bricks | Good Bricks for Construction | Properties of Bricks | Brick Masonry | Brick Properties and Uses | Compressive Strength of Brick. Thank you for the full reading of this article in "QA QC Civil Engineering" platform in English. If you find this post helpful, then help others by sharing it on social media.
Full article on Qualities of Good Bricks | Tests for Bricks | Grading of Bricks | Characteristics of Good Bricks | Good Bricks for Construction | Properties of Bricks | Brick Masonry | Brick Properties and Uses | Compressive Strength of Brick. Thank you for the full reading of this article in "QA QC Civil Engineering" platform in English. If you find this post helpful, then help others by sharing it on social media.