Basic Civil & Mechanical Engineering: UNIT II: h. Bricks
Testing of bricks
The shape of bricks should be truly rectangular with sharp edges. Bricks should be of standard size (190 mm × 90 mm × 90 mm).
TESTING OF BRICKS
1.
Shape and Size Test: The shape of bricks should be truly
rectangular with sharp edges. Bricks should be of standard size (190 mm × 90 mm
× 90 mm).
2.
Soundness Test: This test is performed by striking two
specimen bricks with each other. The bricks should not break. A clear ringing
sound should be produced.
3.
Structure Test: A specimen brick is broken. Its
structure is studied. Its structure should be homogeneous, compact and free
from any defects such as holes, lumps, etc.
4.
Test for Colour Uniformity: Bricks should have a uniform deep
red or cherry colour.
5.
Hardness Test: It is conducted by making a scratch on
brick surface with finger nail. If no impression is left on the surface, the
brick is hard. The brick should not break when dropped flat on hard ground from
a height of about one meter.
6.
Crushing or Compressive Strength Test: Brick is tested in
Compression Testing Machine.
7.
Test for the Presence of Soluble Salts / Efflorescence Test: Efflorescence
is a defect caused by soluble salts. Patches of white or grey deposits on its
surface indicates the presence of soluble salts. It spoils both the appearance
and the strength of the bricks.
8.
Water Absorption Test: The specimen brick is first weighed
dry. It is then immersed in water for 16 hours and weighed again. The
difference in weight indicates the amount of water absorbed by the brick. It
should not exceed 20% of the weight of dry brick.
Basic Civil & Mechanical Engineering: UNIT II: h. Bricks : Tag: : - Testing of bricks
Basic Civil & Mechanical Engineering: UNIT II: h. Bricks
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Basic Civil and Mechanical Engineering
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