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. 502 Only materials which the Contractor intends to used for concreting on the works shall be used in preparing these mixes. ii) The workability of each trial mix shall be recorded. iii) The concrete shall be mixed in a mechanical and/or weigh batch mixer of adequate capacity. The ingredients shall be added to each batch of mix by weight, volume or both as the case may be so as to ensure accurate proportioning. Water for each batch of concrete shall be measured in a standard container so as to ensure the same amount of water being used each time and to during the following mixer charging operation. The mixing of each batch shall be done for a period of not less than two minutes or shall continue until there is a uniform distribution of materials, having the mass of uniform colour and consistency. Every care shall be taken to ensure that there is not segregation while unloading the mixture. iv) Mixing shall be done as near the place of placement as possible and adequate shed shall be constructed over the mixer to protect the discharged concrete from the effect of direct sun rays. Small additional amount of water, if necessary, shall be allowed to be added to the mixer to compensate for any anticipated evaporation losses during transport. v) The quantity of water to be added shall be sufficient to allow a workable mix being made, tamped and virated into all part of the mould and between the reinforcement.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 503 46.0 DEFECTIVE CONCRETE The defective concrete shall be cut out and the work reconstructed with fresh concrete of required quality in the presence of the Engineer. The concrete thus cut out shall not be reused under any circumstances. Should any concrete become permanently damaged due to cracking or broken or damaged from whatever cause or should any concrete be found defective in quality due to honey combing or bad workmanship, it shall be removed forthwith and replaced by concrete of required quality at the cost of the contractors to the satisfaction of the Engineer. 47.0 CONSTRUCTION JOINTS a) Construction joint shall be of an approved shape and shall be vertical or horizontal as required except that in inclined or curved member the joint shall be at right angle to the axis of the member. The joints shall be formed only in placed approved by the Engineer. b) Construction joints shall be provided in the positions described on the drawings or elsewhere and where not so described shall be in accordance with the following. A joint shall be formed horizontally at the beams meeting at the head of column. A joints shall be formed in the rib of a large tee beams and all beams and 25mm below the soffit of the slab. Concrete in a hunch or a splay on a beam or a brace and in the head of column. Where one or more beams meet, shall be placed without joint at the same time as that in the beams or brace. Concrete in the splay at the junction of a wall and slab shall be placed without a
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