Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

15.8.4 For plaster sand used should conform to IS:1542 /196015.8.5 For masonry work sand used should conform to IS: 166/196515.9 Coarse aggregate15.9.1 Coarse aggregate should retain on 4.75 mm IS sieve.15.9.2 (a) Uncrushed gravel/Stone obtain from natural sources,(b) crushed gravel/stone obtain from crushing of gravel/hard stone or(c) partially crushed gravel/stone by mixing of the above two (a & b) is calledcoarse aggregate15.9.3 It should not contain coal, lignite, pyrites mica , shale, clay, soft fragments, andother organic impurities15.9.4 It should not content any material which is liable to cause detrimental effect onsteel reinforcement.15.9.5 The maximum quantity of deleterious material should not exceed the limits asshown in table 1 of IS:383/1970, when tested in accordance with IS:2386/1963.15.9.6 The crushing value of the aggregate should not exceed 45% when deter mindin accordance with the IS: 2386 (Part-IV)-1963 for concrete other than wearingsurfaces and 30% for concrete for wearing surfaces such as runways, roadsand pavement.15.9.7 The coarse aggregate shall satisfy the following requirement of grading.Table No.15.1I.S. Sieve Percentage by Weight Passing the sieve40 mm 20 mm 12.5 mm63 mm 100 ----- --40 mm 95-100 100 --20 mm 30-70 95-100 10012.5 mm --- --- 90-10010 mm 10-35 25-55 40-854.75 mm 0 5 0-10 0-1015.10 Steel15.10.1 Steel shall be free from imperfect edges, surface flaws, rough/jagged and otherharmful defects.15.10.2 It shall conform to IS: 1786 when used for RCC works.15.11 Water15.11.1 Water should be free from oils, acids, salts and other organic material/substances which may be harmful to concrete.15.12 Cement15.12.1 33 grade ordinary Portland cement conforming to IS:269 shall used for variousworks.15.12.2 43 grade ordinary Portland cement conforming to IS:269 shall used for variousworks. It should when tested for setting time by the vicat apparatus methodUrban Administration & Development Department Page 181