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. 564 1.15.9 Tolerances : In accordance with IS: 456 2000 and MORT & H section 1500. 1.15.10 Age of Concrete at Removal of Formwork : In accordance with ISL 456 2000 and MORT & H section 1500. The Engineer may vary the periods specified in IS: 456-2000 if he considers it necessary. Immediately after the forms are removed, they shall be cleaned with a jet of water and a soft brush. 1.15.11 Stripping of Formwork : Formwork shall be removed carefully without jarring the concrete, and curing of the concrete shall be commenced immediately. Concrete surfaces to be exposed shall, where required by the Engineer, be rubbed down with carborundum stone to obtain a smooth and even finish. Where the concrete requires plastering or other finish later the concrete surface shall be immediately hacked lightly all over as directed by the Engineer. No extra charge will be allowed to the Contractor for such work on concrete surfaces after removal of forms. 1.15.12 Repropping : For Multistoreyed buildings the floors may need repropping to support the loads of the upper floors under construction. The extend of such repropping shall be as directed by the Engineer (this does
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 565 not normally exceed one fourth of the props provided above). Such repropping shall not be paid for separately and the cost of such repropping shall be deemed to have been included in the rates. 1.15.13 Reuse of Forms : The Contractor shall not be permitted reuse of timber facing formwork brought new on the works more than 5 times for exposed concrete formwork and 8 times for ordinary formwork. 5 or 8 uses shall be permitted only if forms are properly cared for, stored and repaired after each use. The Engineer may in his absolute discretion order rejection of any forms he considers unfit for use for a particular item, and order removal from the site of any forms he considers unfit for use in the works. Used forms brought on the site will be allowed proportionately fewer uses as decided by the Engineer. Use of different quality boards or the use of old and new boards in the same formwork shall not be allowed. 1.15.14 Hacking-Out 1. Immediately after removal of forms, the concrete surfaces to be plastered shall be roughened with a bush-hammer or with chisel and hammer as directed by the Engineer to make the surface sufficiently coarse and rough to provide a key for plaster.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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