Concreting. In order to achieve accuracy in the proportion of batching, batching plant should be installed and maintained at the site for the concreting work or Ready mix concrete shall be procured on prior approval of Independent Engineer.
Concreting. Coast Guard shall verify rebar placement before concrete pour and witness concrete pour and testing.
Concreting. The stock/condition of cement will be subject to inspection by the Engineer-in-charge at any time and at the time of use in the work. For reconciliation of cement account, consumption of cement shall be considered as under:
Concreting. A. Construct formwork according to ACI 301 and maintain tolerances and surface irregularities within ACI 347R limits of Class A, 1/8 inch for concrete exposed to view and Class C, 1/2 inch for other concrete surfaces.
B. Place vapor retarder on prepared sub grade, with joints lapped 6 inches and sealed.
Concreting. A. Construct formwork according to ACI 301 and maintain tolerances and surface irregularities within ACI 347R limits of Class B, 1/4 inch.
B. Place vapor retarder on prepared subgrade, with joints lapped 6 inches and sealed.
C. Comply with CRSI's "Manual of Standard Practice" for fabricating, placing, and supporting reinforcement.
Concreting. 13.1 The contractor shall design the concrete mix and get the same approved by the Engineer- in- charge. Necessary corrections as required from time to time during the progress of the work shall be carried out by the contractor and got approved by the Engineer- in-charge. Mix. Design shall be carried out as per ISI guidelines IS: 10262, 1982 or any other standard approved method. Rates for all cement concrete/reinforced cement concrete items shall include all expenses on account of and incidental to concrete mix design and corrections thereto from time to time and nothing extra shall be payable on this account.
13.2 The concrete shall be mixed properly in specified proportions in mechanical mixers and shall be of proper consistency. The proper consistency shall be determined by the Engineer- in-charge by slump test, which shall be carried out by the contractor. The concreting shall be commenced only after the Engineer-in-charge has inspected the shuttering and placement of reinforcement and after passing the same. Cost of cones and moulds, labour, tools and plants etc. for the slump test shall be borne by contractor.
13.3 The concrete shall be compacted immediately after placing by means of mechanical vibrators of approved quality, designed for continuous operation.
13.4 The contractor will be responsible for giving the smooth surface of the concrete and no payment will be made for any finishing work done for giving smooth surface of the exposed concrete.
13.5 The contractor/s shall provide all facilities to the Engineer and his staff of taking samples of concrete for arranging tests in accordance with the provision of IRS/ISI Codes referred to. The cost of cubes (except cost of cement) will be borne by the contractor/s. Testing will be arranged by the Engineer- in - charge at the cost of contractor. Members cast out of concrete samples of which have been taken shall be made readily distinguishable. In case, the tests fail to show the strength required according to codes, the reinforcement cement concrete constructions, the member concerned shall be dismantled/ replaced at the cost of the contractors and the cost of the cement thus wasted being debited to the contractor/s.
Concreting. The materials for the concrete are to be carefully measured in the proper proportions, measuring containers of suitable sizes being provided by the contractor and used for the purpose. The contractor is to obey all directives by the Perit in charge concerning the mix. The mixing of concrete, unless otherwise authorized by the Perit in charge, shall be done by batch of approved type, which will ensure a uniform distribution of the materials throughout the mass so that the mixture is of uniform colour and homogenous. The entire contents of the drum shall be discharged before recharging. The mixture shall be cleaned at frequent intervals while in use. The volume of mixed materials shall not exceed the manufacturer’s rated capacity of the mixer. The mixing of each batch shall not be less than 1 minute or exceed 10 minutes under normal conditions. Immediately after mixing, concrete shall be transported to the work and carefully placed around the reinforcement and carefully tamped so as to exclude any voids. A mechanical vibrator shall be used throughout all concrete works. Not more than 30minutes shall elapse between mixing and final placing of concrete. The retampering of the concrete which has commenced to set and remixing with or without additional cement, aggregate or water shall not be permitted. Before placing any new concrete against an existing face, this face shall be roughened, cleaned and brushed over with a thick grout of cement. All concrete shall be well watered and protected from the sun for four days after placing. The quantity of water used shall be the minimum necessary to produce concrete of the workability required by the Perit. The consistency of the concrete when required by the Perit shall be measured by the slump test which in no case shall be more than 100mm.
Concreting. Coast Guard shall verify rebar placement before concrete pour and witness concrete pour and testing.
.4 Installation of tower: Coast Guard shall witness the erection of the new nav-aid tower and witness the installation of both new day-marks.
Concreting. Water leakage. 1. No action. 2. Check the titanium heat exchanger carefully if it is any defect. Too much ice on evaporator Too much ice on evaporator. 1. Check the location of heat pump unit, and eliminate all obstacles to make good air ventilation. 2. Replace or repair the heat pump unit.
Concreting. Concrete shall be of specified grade in the item description. Consistency of concrete, placing of concrete and its compaction, curing, finishing and strength of concrete shall be in accordance with the specification as specified of this Section under relevant clauses as applicable. The mix shall be poured around the steel sections and around the wrapping by vibrating the concrete into position.
