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

General and Technical Specifications For Construction of Hostels at PDPU Campus,
Gandhinagar.
Title – Material Specifications – Civil Works
CHEMICAL COMPOSITION OF STEEL
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Steel designation Maximum percentage
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Carbon Sulphur Phosphorous
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ST-42 W 0.23 0.06 0.06
ST-42 S 0.25/0.28 0.06 0.06
ST-42 O 0.07 0.07
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22.3 The following variety of steel shall be used for structural purposes :
HCP Design and Project Management Pvt. Ltd. Ahmedabad
Section: D
Sheet 11 OF
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ST-42 S : It shall be used for all types of structure (riveted or bolted), including those subjected to dynamic loading
and where fatigue, wide fluctuations of stresses, reversal of stresses and great restraint are involved. It shall be
suitable for welded structures, provided that the thickness of the material does not exceed 20 mm.
22.4 When the steel is supplied by the Contractor, test certificate of the manufacture shall be obtained according to IS :
226 and other relevant Indian Standards.
M-23 Galvanised Iron Sheets :
23.1 The galvanised iron sheets shall be from Tata or equivalent of approved zinc coating class , as approved by the
Architect and Engineer-in-charge. It shall be plain or corrugated, of gauge as specified in item. The GI sheets shall
conform to IS : 277. The sheets shall be undamaged in carriage and handling either by rubbing off of zinc coating or
otherwise, they shall have clean and bright surface and shall be free from dents, holes, rust or white powdery deposit.
23.2 The width of GI sheet shall be as directed, as per site condition.
M-23.A GI Valleys gutter ridges :
23.A.1 The GI ridge and hips shall be of plain galvanised sheets, class-3, of the thickness, as specified in item. These shall
be 600 mm. in width and properly bent up to the shape without damage to the sheets, in process of bending.
23.A.2 Valleys, gutters and flashing shall also be of galvanised sheet, of thickness, as specified in item. Valleys shall be 900
mm. wide overall and flashing shall be 380 mm. wide overall. They shall be bent to the required shape without
damage to the sheet in the process of bending.
M-24 Asbestos Cement Sheets :
24.1 Asbestos cement sheets plain, corrugated or semi corrugated and curved shall be from Everest or equivalent, as
approved by the Architect or Engineer-in-charge. It shall conform to IS : 459. The thickness of the sheet shall be as
specified in the item. The sheet shall be free from all defects such as cracks, holes, deformation, chipped edge or
otherwise damaged.
24.2 It shall manufactured by reinforcing Asbestos in cement, in such a manner that every fibre is covered with fine
particles of cement to ensure maximum strength. It shall be alkali resistance and anti corrosive. It should not break
during transportation, handling, laying etc. and should be non- destructible, non-inflammable and non-organic. It shall
have high tensile strength and high slenderness ratio.
24.3 The minimum nominal thickness of sheets shall be 6 mm., having covering efficiency of about 90% and weight 1518
kg/cm 2 . The sheet shall be free from all defects such as cracks, holes, deformation, chipped edge or otherwise
damaged. The permissible bending stress shall be 130 kg/cm 2 .
24.4 The accessories shall be same thickness that of AC sheets. They shall be suitable for all the types of sheets and
locations. They also shall be from approved manufacturer and shall be free from any defects. The fixing of AC sheets
and accessories shall conform to IS : 730.
24.5 Ridges & Hips :
24.5.1 Ridges and hips shall be of same thickness as that of AC sheets. The different types of ridges shall be suitable for its
corresponding type of sheets and locations.