PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

Cement: Cement shall, whether supplied by the employer or not, comply with the
requirements of IS:8041, IS:455, IS:8043, IS:6909, IS:1489, IS:12269. The testing
laboratory at the discretion by the Engineer, shall perform such tests as are deemed
necessary. Cement bags or bulk silos shall be tagged for identification at location
of sampling. Tests will include tensile tests and weighing the cement supply to
check for net weight received at site and used in the works.
On arrival at site, cement shall be stored in weatherproof silos designed for the
purpose or in dry weather-tight and properly ventilated structures with floors raised
15 to 20cm above ground level, 30cm away from walls and with adequate provision
to prevent absorption of moisture or flooding. All storage facilities shall be subject
to approval by the Engineer and shall be such as to permit easy access for
inspection and identification. Each consignment of cement shall be kept separately
and the Contractor shall use the consignments in the order in which they are
received. Any cement in drums or bags, which have been opened, shall be used
immediately. Different types of cement shall be kept in clearly marked separate
storage facilities. Not more than 15 bags shall be stacked vertically in one pile.
Cement shall be stored in double locking arrangement, so that cement transactions
can be with the knowledge of supervisory staff. Daily account of cement shall be
maintained by the Contractor in the prescribed register and shall be made available
to inspecting authorities for store verification.
The Contractor shall provide from each consignment of cement delivered to the site
such samples as the Engineer may require for testing. Any cement which is, in the
opinion of the Engineer, lumpy or partially set shall be rejected and the Contractor
shall promptly remove such cement from the site.
Cement which has been stored on the site for more than ninety (90) days and
cement which in the opinion of the Engineer is of doubtful quality shall not be used
in the works until it has been retested and test sheets showing that it complies in all
respects with the relevant standard have been delivered to the Engineer.
Water for concrete mixing & curing : Water shall be clean, clear and free from
injurious quantities of salt, traces of oil, acids, alkalies, organic matter and other
deleterious materials. The sources of water shall be approved by the Engineer and
the containers for conveyance; storage and handling shall be clean. If necessary,
standard cement tests shall be conducted using the water intended to be used, in
comparison with those adding distilled water to check quality of water.
GTS : General Technical Specification. Page 55