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. 504 joint, at the same time as that in the slab. Concrete in a beam shall be placed throughout without a joint, but vertical and at the middle of the span. c) Main construction joints are to be keyed by the used of batterns placed in the concrete and subsequently removed before placing new concrete against concrete that has already set or hardened, the face of the old concrete shall be cleaned and roughened and scum and loose aggregate removed therefrom leaving a surface of clean exposed aggregate. Immediately before placing the new concrete the face shall be thoroughly wetted and a coating of net cement ground applied there to. The new concrete shall be well rammed against the prepared face before the grout sets. d) Construction joints in the floor and walls of water retaining structures are to be formed as specified for other joints and in additions and approved water stop shall be used. Stop shall be rubber of P.V.C. not less than 150mm wide and 10mm thick with concrete in an approved manner and joints in the water stop are to be bounded/welded together for the full width of the strip. 48.0 PERMANENT JOINTS a) Expansion joints, contraction joints or other permanent structure joints shall be approved in the position and of the form as detailed in drawing and fully described in the Bill of Quantities. b) Expansion and contraction joints shall be formed by casting the concrete against the joining material. The material shall be lightly but securely fixed to the shuttering forming the joint and
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 505 the concrete bonded to the material. During re-fixing shutters and preparing for the second pour of concrete, all necessary precautions must be taken to protect the jointing material. The concrete on the second pour shall be thoroughly compacted against the material, care being taken with the compacting vibrators and tools to avoid damage to the material. c) The sealing of expansion, contraction joints etc. shall be effected by forming a triangular revete, central over the jointing material. The jointing material shall be neatly cut back, where necessary to the rear of the rebate. The rebate shall be primed and sealed with the approved compound and the face of the sealer pointed or trimmed to a near straight edged line. d) Lead transfer joints shall incorporate dowel and/or link bars in the positions and forms indicated on the drawings. On half of the dowel or link bar shall be firmly cast and bounded into the concrete. The second part of the bar cased in the second concrete pour shall be wrapped with paper fitted with a cardboard cylinder or painted with an approved bitumen paint to prevent the establishment of any bond. 49.0 EXPANSION JOINTING MATERIAL Expansion jointing material shall be supplied in the required thickness and width required and no multi layer joints will be permitted. The material shall comprise at an approved cellular material with a high degree of recovery after crushing and the material shall be thoroughly impregnated with a suitable preservative.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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