Specification Part 3 - Road & Bridge Works - Urban Administration ...

ii)
iii)
iv)
Wire brush to remove all loose rust and
scale; 2 coats drying oil type primer. 2
under coats micaceous iron oxide (MXO)
pigmented phenolic modified drying oil.
Total dry film thickness = 170 µm
Blest clean the surface; 2 coats of quick
drying primer, undercoat alkyd type paint;
1 finishing coat alkyd type. Total dry film
thickness:
130 – 150 µm
Blast clean the surface; 2 coats of drying
type oil primer, 1 undercoat micaceous
iron oxide pigmented drying oil type paint.
Total dry film
thickness : 165 - 190 µm
atmospheric conditions for lengthy period.
Similarly to (i) but where appearance is not
very important provides longer life in mild
condition. Will provide upto 5 years life to first
maintenance in polluted inland environment
Compared to (i), this would provide a longer
life in mild conditions and could be used in
less mild situation e.g., inland polluted, where
maintenance could easily be carried out at
regular intervals
suitable for general structural steel work
exposed to ordinary polluted inland
environments where appearance is not of
primary importance.
v) Blast clean the surface; 2 coats of metallic
lead pigmented chlorinated rubber primer,
1 undercoat of high build chlorinated
rubber; I finishing coal of chlorinated
rubber. Total dry
film thickness : 200 µm
vi) Blast clean the surface; 350 - 450 µm
thickness. coal tar epoxy.
Suitable for structures in reasonably
aggressive conditions e.g. near the coast,
Will provide long-term protection than (iv) in
non-coastal situations. Also suitable for
aggressive interior situation such as
industrial areas.
Suitable for sea water splash zones or for
conditions of occurrence of frequent salt
sprays.
vii)
viii)
ix)
Pickle; hot dip galvanized (Zinc). Total
thickness : 85 nm
Grit blast, hot dip galvanised. (Zinc). Total
thickness = 140 µm
Grit blast; I coat of sprayed zinc/ aluminum
followed by suitable sealer Total thickness
= 150 µm
Suitable for steel work in reasonably mild
conditions Life of 15-20 yean before first
maintenance could be expected in many
situations
Provides a longer life than (vii) because of
thicker zinc coating
Expected to provide long term protection
approx 15-20 years in aggressive
atmosphere
1907. TESTS AND STANDARDS OF ACCEPTANCE
The materials-shall be tested in accordance with relevant IS specifications and necessary test
certificates shall be furnished. Additional tests, if required, shall be got carried out by the Contractor at
his own cost.
The fabrication, furnishing, erecting, painting of structural steel work shall be in accordance with
these specifications and shall be checked and accepted by the Engineer.
1908. MEASUREMENTS FOR PAYMENT
The measurements of this item shall be in tonnes based on the net weight of metal in the
fabricated structure computed on the basis of nominal weight of materials.
The weight of rolled and cast steel and cast iron shall be determined from the dimensions
shown on the drawings on the following basis :
Rolled or cast steel : 7.84 X 10 -3 kg/cu. cm.
Cast Iron : 7.21 x 10 -3 kg/cu. cm.