particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 492 iv) The specific gravity of sand shall not be less than 2.6. v) In no case shall fine aggregate be accepted, containing more than 2% by dry weight not more than 3½% by dry volume, not more than 5% by dry volume of clay, loam or silt. If any sample of fine aggregate shown more than 5% of clay, loam, silt in one hour’s settlement after shaking in excess of water, the lot represented by the sample shall be rejected. vi) The following two field tests are recommended for ascertaining the percentage of clay lumps and impervious organic material and the contractors shall carry out the same if the Engineer deems necessary. 1. Test for determining silt in sand Fill a calibrated tumbler with sand to half its volume and water there to until the tumbler is three quarters full. Shake up the mixture vigorously and allow it to settle for about an hour. The volume of silt visible on top of the sand shall be measure. If the volume of the silt standing over the sand exceeds 5% of total volume of sand. The same shall be rejected. 2. Colorometric test for organic impurities The sample of sand shall be mixed with equal volume of 3% solution (about one ounce, in a quarter of water) of caustic soda/sodium hydrauxide taken in a plain glass and the mixture shall be allowed to stand for 24 hours. The liquid standing above the sand shall not be darker than lights straw (pale yellow) colour. If the colour is marked yellow or brown, the test would indicate presence of organic material in excessive amount.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 493 d) Coarse aggregates In case suitable sand is not available in adequate quantities within a reasonable and economical limit, the contractor may be allowed to use the crushed or pulverised stone or gravel either alone or mixed within natural sand in parts. The stone or gravel shall be clean sharp and free from dust etc. and shall conform to the latest I.S. 383. The percentage of crushed stone to be mixed with sand shall be such as to obtain in fineness modulus of the blended sand within the limits specified above and/or as approved by the Engineer after laboratory test. All coarse aggregates used in concrete works shall consist of crushed rock gravel or other approved inert material. i) Broken or crushed rock from sound blue basalt or black trap free from zeolite or other common impurities shall be used in the concrete as coarse aggregate. The particles of aggregate shall be clean, hard, tough or elongated pieces. The particles of aggregate shall be clean, hard, tough durable, free from deleterious substance and shall contain no soft, flat or elongated pieces. The course aggregate shall have specific gravity not less than 2.6 and the water absorption measured after being immersed for 24 hours in water shall not be more than 6% by weight. The maximum percentage of deleterious materials in the coarse aggregate shall not exceed 5% by weight in the aggregate when tested in conformity with I.S.No.383.
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