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. 348 TESTING : A sample shall be tested for every batch of cement delivered on site on once or for every 1000 bags, whichever is more frequent. Tests shall be carried out for consistency fineness, soundness initial and final setting time, and compressive strength (IS : 4031) and the results approved by the Engineer before use of the cement in permanent works. Samples shall be taken immediately on receipt of cement at site. The methods and procedure of sampling shall be in accordance with IS:3535. The Engineer may specify other forms of sampling and tests including chemical analysis, (IS : 4032) if in his opinion the cement is of doubtful quality; the costs of such additional tests shall be borne by the Contractor. Each and every lot of cement shall be accompanied by the manufacturer’s Test Certificate. 5.2 FINE AGGREGATES (SAND) 5.2.1 It shall be river sand conforming to IS : 383, obtained from sources approved by the Engineer. These sands, if found coarser, shall be suitably blended with finer sand obtained from approved source to obtain the desired grading. The two types of sand will be stacked separately and their mixing in the specified proportions shall be at the Contractor’s cost. The sand shall not contain more than a total of 3% by weight of shale, clay, silt and other structurally weak particles. If permitted by the Engineer crushed stone sand produced from stones, suitable for concrete aggregate, and manufactured in special sand producing crushers such as impactors, hammer mills and processed through stone on stone, vertical shaft crushers for particle shaping and excess fines removed by suitable dust extractors. The particle shape
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 349 shall be nearly cubical. If crushed stone sand contains high percentage of fines, the sand will be separated in two fractions viz. 0 –2.36 mm and 2.36 – 4.75 mm size. These two fractions will be suitably blended to obtain desired grading of sand. If case of crushed stone sand the fines 0.15 mm shall be less than 5%. The crushed stone sand shall be tested for flow time and voids as per ASTM 1252, and if found suitable shall only will be used. 5.2.2 The grading of the sand shall conform to IS : 383 The grading of sand can be improved by mixing two sands. The sand shall be screened on 4.75 mm size vibratory screen to eliminate over – size particles. The sand shall be washed in screw type mechanical washers in potable water to remove excess silt, clay and chlorides. The screening and washing of sand shall be completed at least one day before using it in concrete. The washed sand shall be stored on a sloping concrete platform to drain excess water and in such a manner as to avoid contamination. The fine aggregate shall be subjected to tests in accordance with IS : 2386 as may be ordered by the Engineer. 5.3 COARSE AGGREGATES : 5.3.1 Coarse aggregates for the works shall be crushed stone conforming to IS : 383, obtained from sources, approved by the Engineer. Quarries production aggregates of nearly cubical shape shall be approved.
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