Unformatted text preview: tended
chiefly to lay down requirements
quality of material and the JnaJmcr of their use, and. it does not include
all the necessary provisions of a contract.
1.1 This co& covers general construction
practices ior plain and rcinforced concrete used in dams and other massive structures
and a&s primarily at rigid control of concrete work with a view to CJlSUritlg durability,
1.1 .l Provisions specified in this code are intended to secure for every
part of tile work homogeneous concrete, which when harderled shall have
the desired proprrties.
1.2 This code requires
for each” job. to be supplemented *Since withdrawn.
t Fifth m-vision in 1975.
Chce revised, 6 by special instructions, if any, 18 : 457 - 1957
2.0 For the purpose of this code, the following 2.1 Cement Factor - The weight of cement
per 100 cu ft ) of concrete after compaction. dcfinitiqns shall a[)&. in kg per cubic metre ( or lb 2.2 Concrete -A
mixture of Portland
cement, water, fine and coarse
( and any admixture
by the engineer-in-charge)
mixed and p~acccl in accordance with the code.
-- The relative plasticity
mortar, and measure of its workability.
2.4 Cyclopean Aggregates. - Storm of freshly mixed of neat cement and water of the or cement, sana 2.7 Laitance -- An extremely fine material of little or no hardness
may collect on the surface of freshly deposited concrete or mortar.
2.5 Mortar - A mixture of Portland
cement, fine aggregate
and any admixture approved by the engineer-in-charge.
2.9 Plums or of sizes 7.5 to 15 cm C 3 to 6 in ). 2.5 Engineer-in-Charge
- ‘IIIc Chief Engineer-in-Charge
or his authorized representative.
2.6 Grout -- A mixture
water in fluid state. concrete watks
which and water, -- Large stones over 15 to 23 cm ( or 6 to 9 in ). 2.10 Slump -A
measure of consistency
of freshly mixed concrete is determined
given in Appendix G of *IS : 456-1057. in which subsidence
of a core
in accordarice with the method 2.11 Water-Cement
Ratio - The ratio of the weight of water including
surface moisture of aggrcgatrs,
to the weight of cemrnt used in the conThis ratio may also be expressed as the number of litres of
water per SO kg ( or gallons of water per 112 lb ) sack of cement.
3.1 Cement - Portland
crrncnt and Portlantl
usctl for plain ant1 rc*inforcctl concrctc work in dams and other massive
s<ructurrs shall comply \rith the requirements
of tIS:26Y-1951 and TJh 455
Special cements may also be spcciticd for use in mass
- Admixture, including poztolanas,
wetting agents, ctc, shall be used onlv under speciiic authorization
wherever so l~erniittctl, the proportions’and
methods of use shall Ge specified by the engineer-in-charge.
S revision in 1964. t rwizIoI1 111 976 .
1 Third 7 IS : 457 _ 1957
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- Fall '13
- Bombay, Concrete Association, Concrete Section31 Committee, Concrete Subcommittee