General and Technical Specifications For Construction of Hostels at ...

General and Technical Specifications For Construction of Hostels at PDPU Campus,
Gandhinagar.
Section: D
Title – Material Specifications – Civil Works Sheet 7 OF 44
M-14 Brick Bats Aggregates :
14.1 Brick bat aggregate shall be broken from well burnt or slightly over burnt and dense bricks. It shall be homogeneous
in texture, roughly cubical in shape, clean and free from dirt or any other foreign material. The brick bats shall be less
than 40 mm. size, unless otherwise specified in the item. The under-burnt or over-burnt brick bats and brick dust
shall not be allowed.
14.2 The brick bats shall be hand measured by suitable boxes or as directed.
M-15 Bricks :
15.1 The bricks shall be of first quality hand or machine moulded and made from suitable soils and kiln burnt. They shall
be free from cracks, flaws and modules of free lime. They shall have smooth rectangular faces with sharp corners
and shall be of uniform In colour. The bricks shall be moulded with a frog of size 100 mm. x 40 mm., and 10 mm. to
20 mm. deep on one of its flat sides. The bricks shall not break when thrown on the ground from a height of 1 m.
15.2 The size of modular bricks shall be 190 mm. x 90 mm. x 90 mm.
15.3 The size of the conventional bricks shall be (9"x4.5" x 3") 230 mm. x 110 mm. x 76.5 mm.
15.4 Only bricks of one standard size shall be used on a particular work site. The following tolerances shall be permitted in
the conventional size adopted in a particular work site.
Length : + 1/8"(3.0 mm.). Width : + 1/6" (1.50 mm.). Height : + 1/6"(1.50 mm.).
15.5 The crushing strength of the bricks shall not be less than 50 Kg./cm 2,
. No unburned/over burnt bricks shall be used
for any structure. The bricks should have dimensional stability as per IS standards. The average water absorption
shall not be more than 20% by weight. Necessary tests for crushing strength and water absorption etc. shall be
carried out as per IS : 3495 (Part I to IV) .
Testing Standards :
A. Efflorescence :
Sampling :
Test of 20 bricks is carried out from a stock of 20,000 bricks.
Results :
Moderate.
B. Water Absorption :
Sampling :
Test of 32 bricks is carried out from a stock of 35,000 bricks.
Results :
Absorption shall not be more than 20%.
C. Compressive Strength :
Sampling :
Test of 50 bricks is carried out from a stock of 1,00,000 ( 1 Lac) bricks.
Results :
On average the compressive strength shall not be less than 50 Kg/cm 2 . And every result shall not be less than 20%
of the IS standards.
M-15A First Class Bricks for Exposed brickwork :
15A.1 First class bricks are those which strictly conform to the standard size of modular bricks, i.e. 19 cm. x 19 cm. x 9 cm.
actual size, such that ten layers of brick laid in mortar shall form masonry of 1 m. height. Conventional bricks should
have quality standard as per modular brick except size.
15A.2 These bricks are manufactured from good quality plastic earth, which is free from saline deposits. They are of good
uniform colour. They are well burnt, giving a hard ringing sound when two bricks are struck together.
15A.3 They should have straight edges and even surfaces. They are free from cracks, chips, flaws and modules of lime.
15A.4 When immersed in water for an hour, they do not absorb water more than 1/6th of their weight. On drying, these
bricks do not show any sign of efflorescence.
HCP Design and Project Management Pvt. Ltd. Ahmedabad