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. 542 1.2.4 Curing: v) To secure even and dense surfaces free from aggregate pockets, vibration shall be supplemented by tamping or rodding by hand in the corners of forms and along the form surfaces while the concrete is plastic. vi) A sufficient number of spare vibrators shall be kept readily accessible to the place of deposition of concrete to assure adequate vibration in case of breakdown of those in use. 25mm diameter immersion vibrators shall be used in thin sections upto 125mm, 40mm diameter immersion vibrators in fairly wide sections like beams, slabs, columns etc. and 60mm diameter vibrators in foundation, pilecaps or such large section members. Screed vibratos shall also be used for slab concreting. vii) Plain concrete also shall be vibrated whenever and wherever directed by EIC to achiever full compaction, using needle and screed vibrators as necessary. Curing shall be started at the earliest by spreading wet jute cloth (hessian) and cover top with impervious sheet and subsequently cured with spraying water. In inaccessible area to start with, curing be started by spraying curing compound before starting membrane curing. 1.3 Placing temperatures : During extreme hot weather, the concreting shall be done as per procedures set out in IS: 7861, Parts I & II.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 543 Fine and coarse aggregates concreting shall be kept shaded and the concrete aggregates sprinkled with water for a sufficient time before concreting, in order to ensure that the temperature of these ingredients is as low as possible prior to batching. The mixer and batching equipment shall be also shaded and if necessary painted white in order to keep their temperatures as low as possible. The placing temperature of concrete shall be as low as possible in warm weather and care shall be taken to protect freshly placed concrete form over heading by sunlight in the first few hours of its laying. The time of day selected for concreting shall also be chosen so as to minimize placing temperatures. In case of concreting in exceptionally hot weather the Engineer may in his discretion specify the use of ice either flaked and used directly in the mix, or blocks, used for chilling the mixing water. In either case no extra payment shall be made to the contractor on this account. 1.4 Construction joints : Construction joints in all concrete work shall be made as directed by the Engineer. Where vertical joints are required, these shall be shuttered as directed and not allowed to take the natural slope of the concrete. Before fresh concrete is placed against a vertical joint, the old concreter shall be chipped/sand blasted, cleaned and moistened 25 hours before placing the concrete. All standing water should be removed and dried with compressed air. Neat cement slurry shall be applied on the chipped/sand blasted surface and mortar of the same water cement ratio as the concrete and 10mm thick applied.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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