AHMEDABAD DIVISION TENDER DOCUMENT ... - Western Railway

[Downloaded from Internet]
Foundation casting shall be done in compliance of IS-456-2000 in each and
every respect particularly material quantity, mixing, casting, curing, frame work
etc. Poor workmanship shall not be acceptable.
The graded coarse aggregate 40mm nominal size table 2 of the latest version of
IS 383-1970 shall be used for foundation. A coarse aggregate for grouting and
muffing shall be 20mm grade nominal size as table 2 of the latest version of IS
383-1970(specification for coarse and fine aggregate for natural sources for
concrete) Fine aggregate shall be graded from 10mm down wards.
Notes for Item No. 2
The prices under item 2 shall be same for any shape or size of concrete blocks in
calculating the individual volume of concrete, fraction of a cubic meter beyond
the third decimal shall be rounded of to the next nearest third decimal.
The prices under item 2 shall apply for concreting of all foundation for masts,
portals, anchor blocks for guy rods. For purpose of computation of
volume of concrete of under item No. 2 volume of steel work
embedded in the foundation block and muff shall be subtracted.
Cost of all concrete will be paid for only under item No.2 and the prices of
other items shall not include.
For purpose of computation of volume of concrete under item No.2 the
volume of concrete shall include the volume of sand and bitumen in
sand cored foundation.
For purpose of computation of volume of concrete the volume of each muff for
all mast shall be taken as 0.02 cu. M. Except for mast with balance
weights and for column of portal, each head span mast, 2 or 3 track
cantilever mast and special fabricated mast for which the volume of
muff shall be taken as 0.08 cum.. Irrespective of the size and shape of
muff on a flat basis.
Mixture for casting of foundation shall be 1:3:6 and mixing for grouting shall
be 1:2:4. The gradation of concrete mixture is as per IS 456-2000 or
latest.
Curing of foundation shall be done by contractor for 11 days.
The contractor shall used mechanized methods (vibrator) for casting of
foundation. Only soft water shall be used for casting & curing of
foundation.
TABLE – 3 : PROPORTIONS FOR NOMINAL MIX CONCRETE:
(Clause 8.3, 8.3.1 and 8.3.2)
Grade of Total quantity of dry Proportion of Quantit
Concrete aggregate by mass per fine aggregate y of
50 kg. of cement, to be
taken as the sum of the
of coarse
aggregate (by
water
per 50
individual masses of the mass) kg of
fine and coarse
cement
[ Tenderer ] [ Page 27of 44 ] [For Sr.DEE/ADI ]