SPECIAL REPAIR TO OFFICES, VISITOR ROOM, MICRO LAB AND TOILETS OF 7TH AND 8TH FLOOR OF BLDG NO. P-104 (VIJAY BHAWAN) AND SPECIAL REPAIR TO ORS MESS AND BLDG NO. P1A AT MG AND G AREA SIG COY AT COLABA UNDER AGE B/R (WEST) OF GE (WEST) COLABA, MUMBAI

Identifying and marking carefully the damaged reinforced concrete by tapping with light hammer and chipping of unsound weak concrete and plaster material from slab/beams/columns etc. with power/hand driven chisel as directed by the engineer-in-charge upto 25 mm average depth including saw-cutting of all edges making square shoulders of the cavities, complete all as specified and as directed. (All loose unsound and cracked concrete shall be removed out side MD land) (Note: thickness shall be measured excluding plaster).

Identifying and marking carefully the damaged reinforced concrete by tapping with light hammer and chipping of unsound weak concrete and plaster material from slab/beams/columns etc. with power/hand driven chisel as directed by the engineer-in-charge upto 40 mm average depth including saw-cutting of all edges making square shoulders of the cavities, complete all as specified and as directed. (All loose unsound and cracked concrete shall be removed out side MD land) (Note: thickness shall be measured excluding plaster).

Identifying and marking carefully the damaged reinforced concrete by tapping with light hammer and chipping of unsound weak concrete and plaster material from slab/beams/columns etc. with power/hand driven chisel as directed by the engineer-in-charge upto 60 mm average depth including saw-cutting of all edges making square shoulders of the cavities including, complete all as specified and as directed. (All loose unsound and cracked concrete shall be removed out side MD land) (Note: thickness shall be measured excluding plaster).

Cleaning loose concrete if any all around reinforcement including from behind the reinforcing bars to give an average 10 mm thick (but not less than 10 mm clear air gap) and cleaning reinforcement of total rust using alkaline rust remover with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washed with water and allowing it to dry and Applying two coats of epoxy based passivating, protecting & bonding coat of zinc rich system (Nitozinc (R) primer of Fosroc and equivalent of SIKA/Dr Fixit Pidilite/ Krishna Conchem) as approved by the Engineer-in-Charge for old and new reinforcement any dia, complete all as specified and as directed. (Note : - Length of reinforcement bars cleaned of rust all around shall be measured for payment.)

M & L for Mild steel TMT bars 10 mm dia and over, cut to length, bent to shape required, including hooking ends and binding with and including mild steel wire (annealed) not less than 0.9 mm dia or securing with clips and including welding has to be done with minimum 20 cm over lap for new and old of any height, complete all as specified and as directed.

M & L for Mild steel TMT bars any dia in stirrups, spaces and binders, cut to length, bent to shape required, incl cranking, bending spirally for hooping for columns, hooking ends and binding with and incl mild steel wire (annealed) not less than 0.9 mm dia or securing with clips, complete all as specified and as directed.

M&L for plastering 15--25 mm thick (Avg) polymer modified cement mortar in two coats, 15 mm base coat and subsequent finishing coat with and including curing as per manufacturer's instruction, complete all as specified and as directedby Engr-in-Charge. Make Dr fixit repair Pro-Polymer mortar, FOSROC- RENDOROC S2- structural grade polymer mortar or equivalent in STP . Note : - Ready to use bags will be used for the above item and no extra cost wiil be claimed by the contractor.

Providing and placing in position micro-concrete, grade M40, which shall be cement based prepacked single component, chloride free, non-shrink, free flow, self compacting, ready to use after mixing water in specified proportion, obtained from Fosroc / SIKA / BASF/ Dr Fixit, thickness of section upto 75 mm, complete all as specified and as directed by the Engineer in charge. (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).

Providing and fixing special water tight centering and shuttering including bolting, strutting, propping etc. so as to withstand a pressure of 0.1 Mpa including removal of form from all locations including beams, columns, slabs, walls, foundations, footings, landings, stairs, balconies etc., complete all as specified and as directed.

M&L for repairs to sunken portion of slab.Treatment of sunken floor slab compraises of the following specifications and all as specified :- (i) M&L for cleaning the sunken/lowered portion of RCC slab surface (including vertical total depth plus skirting height) of floors by wire brush, chisel out any mortar sticking to the surface and brooming completely. 40mm thick avg PCC 1:2:4 type B-0 using 12.5mm graded aggregate as in padding conc to achieve proper slope including cutting holes in bricks or RCC wall for spout. (ii) Rendering of uneven surfaces with 6mm thick CM 1:4 mixed with integral water proofing compound @ 3% by wt of cement consumed. Fill it with water and check dampness and seepage. Where dampness/seepage is noticed, nozzles shall be fixed and grouting carried out. (WPC shall be measured & paid separately). (iii) All junctions points of side wall where CI/GI pipes are passing through shall be sealed with epoxy puty. (iv) After drying putty, wash the slab and sides of sunken portion with water and make it clear and clean.