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 3 OF 44
3A.3 It shall capable of giving required workability, final strength and better surface finish.
M-3B Sulphate Resistant Cement (SRC) :
3B.1 Sulphate resistant cement shall be from source like Gujarat High Tech or equivalent as approved by the Architect and
Engineer-in-charge. It shall conform to relevant IS code or BS-4027 & ASTM C-150 Type-II. Test certificates showing
that the cement complies to the specifications must be submitted to the Architect.
3B.2 It shall be used for structures in or near sea water, where the soil conditions are aggressive, where repeated cycles of
drying and wetting are occur, and also for structures which are exposed to Sulphate attack & salty weather like
foundations, bridges, dams, tunnels, industrial drains, sewage pipes.
3B.3 It should possess low heat of hydration, more compressive strength at 3,7 and 28 days than OPC. It should be
capable of withstanding attack of aggressive substances which damage concrete structure like Sulphates of Sodium,
Magnesium, Calcium etc. It should have low co-efficient of expansion.
M-4 White Cement :
4.1 The white cement shall conform to IS : 8042-E
M-5 Coloured Cement :
5.1 Coloured cement shall be with white or grey Portland cement mixed with pigments as specified in the item of the
work.
5.2 The pigments used for coloured cement shall be of approved quality and its quantity shall not exceed 10% of the
cement used in the mix. The mixture of pigment and cement shall be properly ground to have a uniform colour and
shade. The pigments shall have such properties as to provide for durability for colour under exposure to sunlight and
weather.
5.3 The pigment shall have the property such that it is neither affected by the cement nor detrimental to it.
M-6 Sand :
6.1 Sand shall be medium/coarse natural sand, clean, well graded, hard, strong, durable and gritty. Sand particles should
be free from injurious amounts of dust, clay, kankar nodules, soft or flaky particles of shale, alkali, salts, organic
matter loam, mica or other deleterious substances and shall be got approved from the Engineer-in-charge and
Architects. The sand shall not contain more than 8% of silt as determined by field test and 3% by laboratory test , if
necessary the sand shall be washed to make it clean. All sand to be used for plaster, brickwork , concrete shall
be strictly sieved by 4.75 mm seive.
Testing Standards :
A. Silt Content :
Sampling :
Test shall be carried out for every 150 m 3 of sand. The sample taken for testing shall weigh 10 Kg.
Results :
Permissible content shall be 3% in laboratory test & 8 % in field Test.
B. Fineness Modulus :
Sampling :
Sampling shall be as in A.
Results :
Fine sand : 2.2 to 2.6 shall be used as earth filling in plinth, zari, etc.
Medium sand : 2.6 to 2.9 shall be sued for Brickwork and plaster.
Coarse sand : 2.9 to 3.2 shall be used for concrete.
In general, the fineness modulus of sand shall not be less than 2.5 and shall not exceed 3.0. A sand having a
fineness modulus more than 3.2 will be unsuitable for making satisfactory concrete.
HCP Design and Project Management Pvt. Ltd. Ahmedabad