Unnatti Methodology and quality procedure.pdf

However maximum storage to be of not more than 60

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However, maximum storage to be of not more than 60 days. Loss of strength by cement percentage wise is as follows : 2 months - 20% 6 months - 30% 12 months - 40% 24 months - 50% 2] FRESHNESS : No lump to be present. 3] FINENESS : Silky touch & if hand immersed it should be cool. 4] FLOATING Should float on water before sinking 5] PASTE : Should gain some strength after 24 hours curing 5 cm x cm x 5 cm cement cubes in plastic/tin boxes to be made. Keep in water and after 24 hours the edges should remain sharp. 6] ORIGINAL STITCHING : Should be intact. 7] WEIGHT : 50 Kg. II] LAB TESTS : 1] FINENESS (IS 4031 - 1968) a] By Sieving through 90 microns (IS 460-1962) % retained will not be more than 10%. b] Blaine's sair permcability (IS 269-1976) Sq. surface < 2250 m2/gm 2] SOUNDNESS (IS 4031-1968] a] By LeChatlair's [unaerated] [IS 269 - 1976) b] Autoclave method. 3] SETTING TIME (IS 4031 - 1968] a] Initial setting time < 30 min. b] Final setting time > 600 min.
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UNNATTI CONSTRUCTIONS PVT. LTD . (ISO 9001:2000) 42 STEEL I] FIELD TESTS IS 1786 - 1979 1] Marking : Trade & Brand name, grade, ISI Mark. 2] Pitch of twist Bar : 8 to 12 times nominal dia of bar. 3] Colour : Steel Grey 4] Weight : Per meter length 6 mm 8 mm 10 mm 12 mm 16 mm 20 mm 25mm Kg/m 0.22 0.39 0.62 0.89 1.58 2.47 2.98 5] Variation in wt. : Permissible limits as per IS 1786-1985 is as follows Upto 10 mm ± 7% Upto 16 mm ± 5% Above 16 mm ± 3% For 6 mm coils ± 8% 6] Rusting : Should not be there 7] Dia. : As required. 8] Bending : Smooth for bending No. Cracks. II] LAB TEST : 1 ELONGATION In % [on gauge length of 5.65A, where A is cross sectional area. IS 1786 - 1979 II revision 14.8% 2 0.2% proof stress 415 N/mm2 3 TENSILE STRENGTH Min.15% more than 0.2% actual stress
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UNNATTI CONSTRUCTIONS PVT. LTD . (ISO 9001:2000) 43 CHEMICAL COMPOSITION IS 1786 - 1985 Constituent Percent Max. Fe415 Fe500 Fe550 Carbon 0.30 0.30 0.30 Sulphur 0.060 0055 0.055 Phosphorus 0.060 0.055 0.055 Sulphur & Phosphorous 0.11 0.105 0.10 Permissible limits for PRODUCT ANALYSIS Constituent Variation over specified max. limit Percent max. Carbon 0.02 Sulphur 0.005 Phosphorus 0.005 Sulphur & Phosphorous 0.010 In case of deviation form the specified max., two additional test samples shall be taken from the same batch & subjected to tests in which original sample failed. Should both samples pass the test the batch shall be deemed to comply with IS. Should any one sample fail batch shall be deemed not to comply.
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UNNATTI CONSTRUCTIONS PVT. LTD . (ISO 9001:2000) 44 FINE AGGRGATE 1] SILT % IS 383 - 1970 Should not be more than 7-8% by vol. 2] FINENESS MODULUS IS 383 - 1970 FM may range 2.6 to 3.6% for concrete Upto 3% for masonry Upto 1.6% for plaster. 3] ORGANIC IMPURITIES : By visual inspection No lumps & Shingles COARSE AGGREGATE FIXED TESTS : 1] Shape Angular/flaky/hard 2] Size As required. 3] % Mixture No mixing to be observed 4] Quality of stone Blackish/gray uniform colour & hard. 5] Absorption of water in 24 hrs. 5% by weight BRICKS 1] Colour Reddish & uniform 2] Edges Sharp straight at right angle 3] Sizes Ordinary Brick : 23 x 10 x 9 cm / 7.5 cm 9" x 4"x 3.5" / 3" Gattu Brick : 23 x 15 x 10 cm 9" x 6" x 4" 4] Water absorption : 20% by wt.
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