RESTORATION OF RCC STRUCTURE OF COOLING TOWER NO. 1,2,4 AND 5

Amount

Chipping : 25mm average thickness Chipping of unsound/weak concrete material of 25mm average thickness from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges, making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts, all complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height).

Filling/Sealing of cracks/cavities/honeycombed patches : Filling /Sealing of cracks/cavities/honeycombed patches (i.e. 2-3mm) with epoxy based sealing compound or with silicon sealant including making groove by chipping for penetration of sealing compound, cleaning the exposed concrete surface with wire brushes, applying bond coat etc. all complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height). The rate is inclusive of epoxy based sealing compound. Special Product: Masterbrace ADH 2220 of BASF or Equivalent

Nozzle Fixing : Providing and inserting 12mm dia galvanized steel injection nipple in honeycomb area and along crack line including drilling of holes of required diameter (upto 30 mm) up to a depth of 80mm at required spacing and making the hole & crack dust free by blowing compressed air, sealing the distance between injection nipple with adhesive chemical of approved make and allow it to cure complete all complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height).

Injection Low viscosity Epoxy Grouting Providing and injecting approved Epoxy injection grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete/masonry by suitable gun/ pump at required pressure including cutting of nipples after curing etc. all complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height). (The payment shall be made on the basis of actual weight of approved epoxy grout injected) Special Product: Master Inject 1315 of BASF or Equivalent

Providing & Grouting of Shear key : Providing & Grouting of Shear key of MS Bar of 12mm dia. and 125 mm embedding length by drilling holes in concrete by suitable means. The shear keys are provided for holding existing inclined concrete suspenders (“I” shape anchored in position. The anchoring of shear keys shall be done by injecting with suitable epoxy resin hardening system in to the existing concrete all complete as per specifications and direction of Manager-In-Charge. a) The rate shall be inclusive of epoxy resin grout to be injected in to the concrete of approved brand & manufacture) b) Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height) c) The Steel for Shear keys(MS Bar) will be issued by NALCO at free of cost. d) The agency should visit the site and ascertained before quoting the rate. Special Product: Master Flow 935 of BASF or Equivalent

RCC Jacketing with Micro-concrete Providing and casting free flow high strength Micro-concrete. The Micro-concrete of approved brand for Jacketing work shall be prepared as per manufacturer’s specification, complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height.) Special Product : MasterEmaco S466 of BASF or Equivalent

Providing and fixing centering, shuttering: Providing and fixing centering, shuttering, strutting, propping etc. for all types of works with good quality shuttering ply of any shape and size including firmly fixing in position with screws, bolts, separators, tension devices, true to line and level, stripping off the same after specified period etc. for all heights complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height)

Reinforcement in RCC works : Steel reinforcement for RCC work including transportation from Nalco store, straightening, cutting, bending, placing in position and binding at all height, complete as per specifications and direction of Manager-In-Charge. Reinforcement steel shall be issued free of cost at NALCO stores. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height)

Wire mesh : Providing and fixing hard drawn steel wire fabric of size 75x25mm mesh or other approved size wire mesh to be fixed & firmly anchored to the concrete surface by means of "L" shaped mild steel shear key welded with existing reinforcement including the cost of materials, labour, tool & plants all complete as per specifications and direction of Manager-In-Charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height)

Bond Coat : Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Manager-In-charge. Epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height). Special Product : Masterbrace 1414 of BASF or Equivalent.

Shotcrete – 25mm thick: Providing and casting ready to use cement based spray applied repair mortar for CT Fan Dome shell on external side using shotcrete machine at a pressure of 3 Kg/cm2 of approved brand and manufacturer. The maximum aggregate size shall be 6 mm. The shotcrete application procedure shall be as specified by the manufacturer. The quantity of Steel fibre that shall be added at the rate of 250gms per 25 Kg of micro-concrete etc. complete as per the specification and direction of Manager-in-charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height) SpecialProduct:MasterEmacoS810 of BASF or Equivalent.

Chemically modified Polymer Plaster: 12 mm average thickness Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Manager-in-charge. Note: Measurement and payment: The pre-measurement of thickness shall be done just after the surface preparation is completed and Payment under this item shall be made only after proper wet curing has been done and surface has been satisfactorily evaluated by sounding / tapping with a blunt metal instrument and/or the 75mm size cube crushing strength at the end of 28 days to be not less than 30 N/mm2). (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height). Cement will be issued by NALCO at free of cost at Nalco Store. Special Product : Master Emaco SBR 2 of BASF or equivalent.

Same as Item no-12 but for 25 mm average thickness, applied in 2 layers

Crack Bridging waterproof Coating: Providing and applying Crack bridging water proof flexible coating as per manufacturer’s specification of approved brand, manually using brushes on the wet hardened concrete surfaces after cleaning the surface and removing all loose particles/deposits etc. complete as per specification and direction of Manager-in-charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height) Special Product : Master Protect 180 of BASF or equivalent.

Anti-carbonation Coating: providing and Finishing with Anti-carbonation Epoxy paint (two or more coats) on concrete work at all locations prepared and applied as per manufacturer's specifications including appropriate priming coat, preparation of surface, complete as per specification and direction of Manager-in-charge. (Rate includes steel/ aluminium scaffolding with safety net along with other PPEs for all works executed at height). Special Product : Master Seal 300H of BASF or equivalent.

STANDARD REHABILITATORS PVT.LTD