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. 354 TABLE - 2 Sr. No. Area of Concrete work Slump mm 1a Structure with exposed inclined surface requiring low slump 25 concrete to allow proper compaction 1b Plain C.C. 25 2 R.C.C. structure with widely spaced reinforcements i.e. solid columns, piers, abutments, footings, well-steinings 3 R.C.C. structures with fair degree of congestion of reinforcement. Viz. pier and abutment caps, box culvers, weil curbs, well caps, wall with thickness greater than 300mm 4 R.C.C. and PSC structures, with highly congested reinforcement viz deck slab, girders box girders, wall with thickness less than 300mm. 5 Under water concreting through tremie, bottom plug, cast in situ piling 40 to 50 50 to 75 75 to 125 100 to 200 6 Cast in situ piling work using tremie pipe 100 to 180 Note: 1. The slump of structure concrete with water will be 25mm (Max). Any slump in excess of 25mm, shall be obtained by adding suitable dose of approved super plasticizer. 2. In case of pumped concrete the slump requirement may be kept as per RMC mix design. Excess slump (above 25mm) shall be obtained by adding suitable dose of approved admixture/plasticiser. The mixes are designed to yield mean strengths (f’ cm) greater than the corresponding specified characteristic strengths (f’ ck) as indicated in Table 1. The difference between f’ cm and f’ ck is called the ‘Current Margin’. The concrete mixes shall be designed on the basis of required
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 355 strength, impermeability, desired workability, the maximum size of aggregate and also the various cements. Accordingly the required cement content shall be ascertained. 5.7.3 For each grade a total of 18 cubes and 3 cylinders of size 150 mm dia and 160 mm highs shall be made. Of these 18 cubes made not more than 6 may be made on any day and further, of the 6 cubes made in one day not more than 2 each representing a different batch of concrete shall be tested at the age of 28 days. The making of the cubes, their curing, storing, transporting and testing shall be in accordance with Indian Standards I.S. 516. After 28 days of curing the cylinders will be tested for permeability as per MORT&H clause 1716.5 and DIN 1048. The tests shall be carried out in a laboratory approved by the Engineer. 5.7.4 If the average strength of the concrete cubes falls below the required target mean strength (f’ cm), fresh preliminary mixes for that grade shall be made as before, until the trial mixes yield cubes of compressive strength at 28 days greater than the required average target mean strength (f’ cm) at that age. 5.7.4.1 Where concrete is produced at continuous production unit, such as ready mix concrete plant, the Engineer may allow use of established mix design, provided it complied with all requirements of tender specifications. In this case, the responsibility of attaining required strength and other properties lies with the supplier and contractor. The manufacturer shall submit the detailed calculation of mix design if desired by Engineer.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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