Numerical values the nujnber of places rdained in the

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Unformatted text preview: tended chiefly to lay down requirements regardirlg quality of material and the JnaJmcr of their use, and. it does not include all the necessary provisions of a contract. 1. SCOPE 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, strength, impermeability and uniformity. 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 to be supplemented *Since withdrawn.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. TERMINOLOGY 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 aggregates ( and any admixture approved by the engineer-in-charge) mixed and p~acccl in accordance with the code. 2.3 Consistency -- 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 and 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 crete mix. water per SO kg ( or gallons of water per 112 lb ) sack of cement. 3. MATERIALS 3.1 Cement - Portland crrncnt and Portlantl bl;tstfurnacc slag cement 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 1953, respectively. Special cements may also be spcciticd for use in mass concrete. 3.2 Admixture - Admixture, including poztolanas, air entraining agents, wetting agents, ctc, shall be used onlv under speciiic authorization and wherever so l~erniittctl, the proportions’and methods of use shall Ge specified by the engineer-in-charge. --.____-_ l ccotld S revision in 1964. t rwizIoI1 111 976 . 1 Third 7 IS : 457 _ 1957 3.2J Material...
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