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. 508 material which shall give a good finish to the concrete surface finish. For work which are of respective nature, such as column footings, pedestals for pipe pedestal footing. The formwork shall be fabricated out of steel plates and structurals to obtain uniform finish throughout the work. In call cases the form work shall be inspected and approved by the Engineer, before any concreting is started. The contractors shall however, be solely responsible for the proper design, adequacy and stability of the formwork. If at any time in the opinion of the Engineer, the formwork provided is not considered sufficiently rigid and/or is defective the contractors shall improve or strengthen the same in such a manner as the Engineer may direct. d) Removal of form work In no circumstances shall forms be stuck off until the concrete reaches adequate strength as required or without obtaining permission of the Engineer. All form work shall be removed without such shock or vibration as would damage to concrete. Before the soffit and the strats are removed the concrete surface shall be exposed where necessary in order to ascertain that the concrete has hardened sufficiently. The responsibility for the removal of the form work whether whole or part, shall rest entirely with the contractors who must nevertheless be guided by the opinion of the Engineer in this regard. The work of striking and the removal of form work shall be conducted in the presence of the Engineer and under personal supervision of a competent foremen in the employment of the contractor.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 509 Generally nothing less than the following times should elapse between the filling in of the concrete and the removal of the forms. i) Vertical sides of slab, beams and columns 48 hours ii) Bottoms of slabs upto 15 ft/4.6 metre span 7 days iii) Bottoms of slabs above 15 ft./4.6 metres 14 days span. Bottom of beams upto 20 ft./4.6 metre span and Arch rib bottoms upto 20 ft./6 mt. Span iv) Bottoms of beams over 20 ft/6 metre span 21 days and arch rib above 20 ft./6 mt.span e) Surface treatment and finish When the form work is struck, all the faces of concrete shall be smooth and sound, free from voids and air holes. Any roughness or irregularity on the exposed surfaces shall be immediately filled up while the concrete is still green with cement ground, cement wash and/or 1:11/2 cement mortar properly trowelled and finished. Such patching of the concrete face shall be carried out with the permission of the Engineer. If the concrete is found honey-combed, the honey combed protion and whatever surrounding concrete that may be considered unsatisfactory by the Engineer shall be dismantled and fresh concrete of proper quality shall be reinstated at contractor’s cost.
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