ADDITION/ALTERATION AND SPECIAL REPAIRS TO GANGOTRI (P-3A) AND BHAGIRATHI (P-3B) BUILDING AT NOFRA, COLABA, MUMBAI

Taking down cement or cement lime plaster of any description on brick or stone walls, etc including raking out joints, hacking for key, scrubbing down with water, etc including errection of double steel scaffolding, covering with green cloth and all the safety measures/ precautions and remove the debries outside MD land (as per directions of BMC) complete all as specified and as directed.

Material and labour for chipping, removing carefully concrete work by low impact hammer, breaker without damaging the structure & cleaning and disposal of debries out side the premises etc , including errection of double steel scaffolding, covering with green cloth and all the safety masures/ precautions and remove the debries outside MD land (as per directions of BMC) complete all as specified and as directed. (Hard concrete should not be removed by force).

Demolition of reinforced cement concrete as in roofs, floors (other than ground floors), beams, staircases, landing, chajjas, parapet wall, chimney, wall and similar suspended work including cutting of reinforcement cut as required to facilitate demolition including removing of debris out side MoD land complete all as specified and directed by Engineer-In-charge. (Reinforcement cut as required to facilitate demolition)

Clean existing reinforcement with wire brush/ rotary wire brush to make surface free from rust scales, loose material, dirt etc. complete and providing, applying two coats of alkaline rust converting primer confirming to ASTMB- 117, on the existing rebars and allowing it to react with rust for 6 hrs and form a corrosion resistant, insoluble and adherent protective layer , including cleaning the reinforcement,wirebrushing to remove loose rust spalls, with time interval of 1hour between the coats.

Replacement of steel reinforcement with TMT bars of appropriate size where 20% of cross section is reduced including dismantling of rusted steel including application of rust converter FEOVERT and applying protective coating IPNET_RB Complete all as specified and directed

Providing and application of hitech concrete penetrating, water based, organic, Bi-polar, calcium nitrite free, migratory corrosion inhibitor on concrete surface having Ph 9.5 which migrates to a virtual extent of 100 mm inside concrete through pores, to inhibit the corrosion process on embedded steel at both anodic and cathodic ends by depassivating the Electro-chemical reaction in that region thereby protecting rebar on all sides.

Drilling Holes of 12mm dia, upto 100mm deep holes in structural members at the intervals of 300 to 500mm in staggered manner or along the crack as directed by the Engr-in-charge in RC structural element including Cleaning of the holes by air blower and Inserting 12mm dia. Teflon nozzles compatible with epoxy injector and having machined external end to receive outlet of grouting gun. Fix it inside the holes by applying thixotropic epoxy putty to ensure complete sealing and allow to cure the system for min.8 hrs before grouting including removing nozzle projections, excess putty if any over concrete element grinding, levelling and finishing the external surface, after completion of the work, etc complete. Note : Epoxy putty cost are included . Drilling of hole shall be done by authorized applicator and the work shall be executed in the presence of company representative.

Grouting Injecting low viscosity high molecular weight thermosett polymer Monopol 250 H by pressure and using pressure epoxy injector with accessories till nozzles refused to accept the grout, Including Mixing material components part a and part b in required quantities as per mfg instruction by weigh batching Filling the grouting gun with monopol 250 H and maintaining desired pressure in the gun, air compressor and at exit (minimum 3 to 4 kg/Cm2) by a mechanism to monitor both pressure gauges and controlling the same by release valves and release the grout as per requirement simultaneously to grout the structural element through prefixed nozzles till its refusal. Seal the nozzle with thixotropic epoxy putty after the refusal. Note : leakages through other nozzles or cracks are required to be monitored while grouting and such points to be sealed as and when required without any extra cost.

Mixing and applying SBR latex modified cementitious bond coat using cement 2.2 kg per square metre on prepared concrete surfaces of parent material complete all as specified and as directed (Note: SBR latex shall be paid for separately).

Mixing and applying SBR latex modified cement mortar 30 mm thick in cement sand mortar in proportions of 1:3 (1 part cement and 3 parts quartz aggregate) with polymer admixed in proportions as approved, including trowelling with wooden tools on prepared concrete surfaces of parent material complete all as specified and as directed by Engineer-in-charge. (Note : Rate includes the rate of steel scaffolding. No separate payment shall be paid for scaffolding). (Note: SBR latex will be measured and paid separately as supply only).