Placing Concrete Sample Clauses

Placing Concrete. Form work and reinforcement shall be approved in writing by the Engineer prior to placing of concrete. Concrete shall be placed in its final position without segregation. The forms shall be well wetted and all shavings, dirt and water that may have collected at the bottom shall be removed before concrete is placed. The interval between adding the water to the dry materials in the mixer and the completion of the final placing inclusive of compaction of the concrete shall be not more than initial setting time of the cement, normally 30 minutes for ordinary Portland cement. The concrete shall be well placed in the form work by means approved by the Engineer and shall not be dropped from a height or handled in a manner which may cause segregation. Any drop above 100 cm shall have to be approved by the Engineer. Once the concrete is placed in its final position, it shall not be disturbed. After the concrete has been placed, it shall be spread and thoroughly compacted by approved mechanical vibration to a maximum subsidence without segregation and thoroughly worked around reinforcement or other embedded fixtures into the correct form and shape. Vibration shall not be used for pushing and shoveling concrete. Vibrator must be operated by experienced men and over vibration shall not be permitted. No concrete shall be placed in open, while it rains. If there has been any sign of separation of cement and sand by washing, the concrete shall be entirely removed immediately. Suitable precautions shall be taken in advance to guard against rains before leaving the fresh concrete at site. No accumulation of water shall be permitted on freshly laid concrete. Slabs, beams and similar members shall be poured in one operation normally. Bleeding of under layer, if any shall be effectively removed. Moulding, throating, drip coarse, etc. shall be poured as shown on the drawing or as directed by the Engineer. Holes shall be provided and bolts sleeves, anchors fastenings or other fixtures shall be embedded in concrete as shown on the approved drawings or as directed by the Engineer. Any deviation there from the drawing shall be set right by the Contractor at his own expense as instructed by the Engineer.
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Placing Concrete. All concrete shall be placed under the following conditions: a) Each load shall be checked for air content; b) Slump test shall be taken on the first load of concrete arriving on the job site, and thereafter at the discretion of the City; c) In dry forms, accepted by the City; d) As near as possible to its final position; e) Maximum vertical drop from, chutes shall be 1.5m; f) Evenly on both sides of expansion joints so as to retain their vertical position; g) Forms shall be filled with an excess of concrete, thoroughly spaded, compacted, and struck off to its required level in such a manner as to force the coarse aggregate below the surface of the mortar; h) Provide mechanical vibration as necessary to avoid honeycombing, entrapped air voids, sand streaks and placement lines. Do not over-vibrate, causing segregation, loss of entrained air and /or form deflection/failure; i) Air temperature shall be 5ºC and rising, and all necessary precautions shall be taken during cold weather to the satisfaction of the City; j) No concrete shall be placed on frozen ground; and k) Concrete shall have a temperature of not less than 10ºC no more than 38ºC at the time of placing, and means acceptable to the City shall be provided to maintain these limits for seventy-two (72) hours after placing.
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Related to Placing Concrete

  • ENCROACHMENT/ACQUISITION The Assignee/Bank has no notice or knowledge of any encroachment or that the Government or any other authority has any immediate intention of acquiring the whole or any part of the Property for roads or any other improvement schemes and if such encroachment shall be found to exist or if the Government or any local authority has any such intention, the same shall not annul the sale or shall any abatement or compensation be allowed in respect thereof.

  • Dewatering (a) Where the whole of a site is so affected by surface water following a period of rain that all productive work is suspended by agreement of the Parties, then dewatering shall proceed as above with Employees so engaged being paid at penalty rates as is the case for safety rectification work. This work is typically performed by Employees engaged within CW1, CW2 or CW3 classifications. When other Employees are undertaking productive work in an area or areas not so affected then dewatering will only attract single time rates. (b) Where a part of a site is affected by surface water following a period of rain, thus rendering some areas unsafe for productive work, consistent with the Employer’s obligations under the OH&S Act, appropriate Employees shall assist in the tidying up of their own work site or area if it is so affected. Where required, appropriate Employees will be provided with the appropriate PPE. Such work to be paid at single time rates. Productive work will continue in areas not so affected. (c) To avoid any confusion any ‘dewatering’ time which prevents an Employee from being engaged in their normal productive work is not included in any calculation for the purposes of determining whether an Employee is entitled to go home due to wet weather (refer clauses 32.4 and 32.5)