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. 490 iv) The aggregates both fine and coarse shall be hard, strong, durable clean, free from veins and adherant coatings. The use of flaky and elongated pieces of aggregates shall be prohibited. v) The aggregates shall not contain deleterious materials such as iron pyrite, coal, mica, shale or similar laminate material, clay, alkali, soft fragments, sea shells, organic impurities etc. in such quantity as to affect the strength of durability of concrete or the reinforcement embedded in such reinforced concrete. vi) The maximum quantities of deleterious material they may be permitted shall conform to the following limits by weight. Deleterious substance Fine aggregates percent by weight Coarse aggregates percent by weight Uncrushed Crushed Uncrushed Crushed 1. Coal and lignite 1.00 1.00 1.00 1.00 2. Clay lumps 1.00 1.00 1.00 1.00 3. Soft fragments -- -- 3.00 -- 4. Material passing through 75 microsieve 3.00 3.00 3.00 1.00 5. Shale 1.00 -- -- -- vii) The total of various deleterious materials occurring in any sample shall, in no case, exceed 5 per cent. viii) If the aggregate supplied in unclean, it shall be washed. If it is not properly graded, it shall be screened by hand or by mechanical means and the various sizes proportioned to get the required grading.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 491 ix) Storing of aggregate on dusty, muddy and grassy spots shall be avoided. They shall be stored on the works in such a manner as to prevent intrusion of foreign matter and protected from exposure to dust. They shall be placed in stock piles in individual units of suitable sizes and in suitable layers to prevent segregation. They shall not be allowed to run down slopes. c) Sand or fine aggregates All fine aggregates shall consist of clean, hard, strong, durable uncoated siliceous gritty material consisting of well graded particles obtained from rock fragment. It shall be free from clay lumps injurious amount of dust, mica shells, soft or flaky particles, shale, alkali, organic matter load or other deleterious substances. i) The sand shall be taken from source approved by the Engineer. The sand or fine aggregate shall conform to the latest I.S. No.383. ii) If the Engineer considers it necessary, it shall be washed and/or screened before use, at the expense of the Contractors. iii) The sand shall have a fineness modulus of not less than 2.5 and not more than 3.0 and the grading shall conform as far as possible to the following analysis. I .S. Sieve No. Natural sand or crushed gravel Percent passing Crushed Stone 480 95 – 100 90 – 100 240 70 – 95 60 – 90 120 45 – 85 40 – 80 60 25 – 60 20 – 50 30 5 – 30 5 – 30 15 0 - 10 0 – 15
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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