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. 552 The revolving-drum truck bodies of approval make shall be used for transporting the concrete. The number of revolutions at mixing speed, during transportation, and prior to discharge shall be specified and agreed upon. Reliable counters shall be used on revolving-drum truck units. Standard mixer uniformity tests, conforming to ASTM standards C 94-69 “Standard Specifications for Ready Mix Concrete”, shall be carried out if desired by Engineer to determine whether mixing is being accomplished satisfactorily. 1.12.5 Pumping of Concrete: Only approved pumping equipment, in good working condition, shall be used for pumping of concrete. Concrete shall be pumped through a combination of rigid pipe and heavy-duty flexible hose of approved size and make. The couplings used to connect both rigid and flexible pipe section shall be adequate in strength to withstand handling loads during erection of pipe system, misalignment, and poor support along the lines. They should be nominally rated for at least 3.5 Mpa pressure and greater for rising runs over 30m. Couplings should be designed to allow replacement of any section without moving other pipe sections, and should provide full cross section with no construction of crevices to disrupt and smooth flow of concrete. All necessary accessories such as curved sections of rigid pipe, swivel joins and rotary distributors, pin and gate valves to prevent backflow in the pipe line, switch valves to direct the flow into another pipe line, connection device to fill forms from the bottom up, extra strong couplings for vertical runs, transitions for connecting different size of pipe, air vent for downhill pumping, clean-out equipment etc. shall be provided as and where required. Suitable power controlled booms or specialized crane shall be used for supporting the pipe line.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 553 1.12.6 Field control: 1.13 Planning: Sampling at both truck discharge and point of final placement shall be employed to determine if any changes in the slump and other significant mix characteristics occur. However, for determining strength of concreter, cubes shall be taken from the placement end of line. The RMC supplier should nominate a technically qualified representative at site for sampling, testing and placing of concrete. Proper planning of concreter supply, pump locations, line layout placing sequence and the entire pumping operation shall be made. The concreter production, transportation and placing shall be planned in such a manner that duration between addition of water during mixing and placing of concrete in desired location is well within time limits prescribed by the RMC manufacturer, however, this is subjected to fulfillment of slump and other properties of concrete as specified in tender. On failure to adherer to the time schedule by the Supplier the Engineer may reject the concrete. The pump wherever used should be as near the placing area as practicable, and the entire surrounding area shall have adequate bearing strength to support concrete delivery pipes. Lines from pump to the placing area should be laid out with a minimum of bends. For large spacing areas alternate lines should be installed for rapid connection when required. Standby power and pumping equipment should be provided to replace initial equipment, should breakdown occur.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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