BID DOCUMENT - IDCO

(h) All the cut earth shall be stacked at the sides of the building for approval of the engineer and the filling
must be done in presence of the engineer or the authorized representative
(i)
Power hammer/vibration roller must be used for compacting the filling materials.
PLAIN AND REINFORCED CONCRETE
1.01 CEMENT
(a) Cement used in any concrete work shall be Portland slag cement conforming to IS 455 but having
crushing strength of 43 Mpa in cement mortal 1:3 on 28 days strength and may be measured by weight or in a
standard bag to weight 50 Kg. having a volume of 0.04 cum. It shall have the adhesive and cohesive properties
necessary strength and durability. Reference to cement in the following paragraph shall mean Portland slag
cement. In case the engineer or his representative directed use of cement like rapid hardening Portland
cement as per IS 8041-1990 or any other grade of Portland cement the same shall be used at any stage of the
work as directed. Cement of approved (by engineer-in-charge) manufacturer is only to be used in the work.
(b) The cement shall be stored in such a manner as to permit easy access for proper inspection handling
and identification of each shipment and in a suitable water tight and well-ventilated building that will protect the
cement from dampness. It should be kept on wooden platform of at least 300mm high.
(c) Only one brand of cement may be used in the contract except by written permission of the Engineer.
Different types of cement shall be stored separately and shall not be mixed. Only such cement, manufacturers
of which approved by the Engineer shall be used in the work. Works executed by the cement of unapproved
manufacturers shall not be accepted.
(d) The cement shall be protected from moisture and damage in transit and shall be stored on the site in a
store provided with a wooden floor raised not less than 300mm above the ground.
(e) Batches of cement shall be used for the work in the order in which they are delivered to the site.
(f) Notwithstanding any previous acceptance any bag of cement containing materials, which has hardened
or otherwise deteriorated shall be rejected for any cause shall be removed from the site immediately.
(g) Cement, which has been stored at site for more than two months from the date of manufacture, (as
printed over the container by manufacturer) shall not be used for the work and removed from the site
immediately.
(h) The contractor shall deliver the samples of cement collected for the work to the engineer in charge for
his approval after necessary tests in a reputed material testing laboratory of the state. After getting the
approval from the engineer in charge, the contractor shall use the cement in construction works. In the event of
any s sample being found to be not in accordance with relevant Indian Standard, he whole consignment from
which the samples come shall be rejected and removed from the site immediately notwithstanding any
previous acceptance on the strength of the manufacturer’s certificate.
(i) Use of re-bagged cement will not be allowed.
1.02 FINE AGGREGATE
(a) The fine aggregate shall be sand or any other inert materials having similar characteristics and shall
consist of hard, strong uncoated particles free from injurious amounts of organic or other deleterious
substances. To obtain such an aggregates, screening or washing or both as may be directed by the Engineer
shall be employed shall be employed. It shall be uniformly graded from fine to coarse with the following limits
as least or specification by the Engineer.
Sieve no. ISI
Percentage Passing by Wt.
10mm 100
4.75mm 90-100
2.36mm 85-100
1.18mm 75-100
600 micron 60-79
300 micron 12-40
150 micron 10
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