structural repair works of GCDA staff quarters and main office building kadavanthra

Amount

Centering and shuttering including strutting, etc. and removal of form for:Suspended floors, roofs, landings, balconies and access platform

Disposal of building rubbish/ malba/ similar unserviceable, dismantled or waste materials by mechanical means, including loading, transporting, unloading to approved municipal dumping ground or as approved by Engineer-in-charge, beyond 50 m initial lead, for all leads including all lifts involved

Chipping of unsound/weak concrete material from slabs, beams, columns etc.with manual Chisel and/ or by standard power driven percussion type or ofapproved make including tapering of all edges, making square shoulders ofcavities including cleaning the exposed concrete surface and reinforcementwith wire brushes etc. and disposal of debris for all lead and lifts all completeas per direction of Engineer-InCharge25 mm average thickness

Cleaning of reinforcement from rust from the reinforcing bars to give it a totalrust free steel surface by using alkaline chemical rust remover of approvedmake with paint brush and removing loose particles after 24 hours of itsapplication with wire brush and thoroughly washing with water and allowingit to dry, all complete as per direction of Engineer-In-Charge.Bars upto 12 mm diameter

Drilling suitable holes in reinforced or plain cement concrete with power drivendrill machine to a minimum depth of 100mm upto 200mm in RCC beams, lintels,columns and slabs to introduce steel bars for sunshades/balconies includingfixing the steel bars in position using epoxy resin anchor grout of approvedmake but excluding the cost of reinforcement, all complete as per direction ofEngineer-InCharge.Upto and including 12mm dia.

Providing, mixing and applying bonding coat of approved adhesive on chippedportion of RCC as per specifications and direction of Engineer-In-chargecomplete in all respect.Epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make

Providing, mixing and applying SBR polymer (of approved make) modifiedCement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand withpolymer minimum 2% by wt. of cement used) as per specifications anddirections of Engineer-in-charge.Note: Measurement and payment: The premeasurement of thickness shall bedone just after the surface preparation is completed and Payment under thisitem shall be made only after proper wet curing has been done and surfacehas been satisfactorily evaluated by sounding / tapping with a blunt metalinstrument and/or the 75mm size cube crushing strength at the end of 28 daysto be not less than 30 N/Sqmm2).25 mm average thickness in 2 layers.

Repair to plaster of thickness 12mm to 20 mm in patches of area 2.5 sqm and under,including cutting the patch in proper shape, raking out joints and preparing plasteringthe wall surface with white cement based polymer modified self curing mortar, includingdisposal of rubbish, all complete as per the direction of Engineer-In-Charge

Steel reinforcement for R.C.C work including straightening, cutting, bending, placing in position and binding all complete above plinth level.Thermo - Mechanically Treated bars of grade Fe-500D or more

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