GE/ALP (8616) KOLKATA OF 2026-27

Dismantling removing all unsound concrete, plastered material by chipping/chiseling gently at all effected and adjoining areas of concrete etc till sound surface is reached all various locations in building subsequently cleaning the surfaces by hair brush and air blower and including removal of debris outside MoD land complete all as specified and directed.

Removing of concrete all around reinforcement bar upto 12 mm dia and over from behind the reinforcing bars average 25mm (but not less than 15mm air gap)by manual methods (using wire brushing ,chiseling etc) and M&L for applying chloride free rust removing chemical on rusting steel reinforcement bar and removing all rust from steel reinforcement bar by emery paper and M&L for cleaning the area thoroughly by water and allow it to dry and totally rust free of reinforcement bar including complete all as specified and directed. Make( Rust removing chemical ):- Reebaklens RR of FOSROC or equivalents solutions SIKA/STP as approved by GE.

Preparation of existing reinforcement surface by brush and M & L for applying two component epoxy zincrich primer on existing reinforcement surface (minimum specific gravity 1.75, adhesive bond strength with steel is 1.50N/mm2) and maximum coverage area 5.00 Sqm per litre. complete all as specified and directed. Make- Nitozinc primer of FOSROC or equivalent make as approved by GE.

M&L for TMT reinforcement bars upto 12 mm dia and over for structural connection in RCC beams, columns, lintel and slabs including power drilling holes of appropriate diameters in reinforced or plain cement concrete to a minimum depth of 150mm and upto 200mm including power drilling, fixing the reinforcement in position using epoxy, cleaning of loose dust by blowing air, sealing with epoxy cartridges etc complete all as specified and directed.

Supply, mixing and placement of micro-concrete cement based prepacked single component chloride free, sulphate free, non-shrink, free flow. elf compacting, ready to use after mixing water in specified proportion. (Make: Sika Rep Microconcrete-4 or renderoc-RG of Fosroc as approved by GE) in required thickness as per manufacture's instruction having. Compressive strength (ASTN C 109,cm cube) of 35 MPa at 28 days including application curing compound concrete WB manufactured by Fosroc of equivalent as approved by GE at various locations in Bldgs including necessary form work complete all as per manufactures specification

M&L for providing and applying at two component structural grade polymer modified reinforcement mortar (Make: Fosroc Renderoc S2 or equivalent as approved by GE) upto a thickness of 30 mm over & including a coat of epoxy resin bonding agent (Make: Nitobond EPor equivalent as approved by GE). The cured mortar shall achieve a minimum compressive strength of 12N/mm2 in a day & 45 N/mm2 in 28 days with Flexural strength 8N/mm2 in 28 days Chloride diffusion coefficient shall be Nil after 24 hours when tested by Accelerated electrochemical chloride ion diffusion test method and the depth of carbonation shall be Nil after 24 hours when tested by Accelerated carbonation test. in addition to this percentage of water absorption should be 0.45 after 24 hours in immersion test at various locations in Bldgs complete all as per manufacture's specification.

M&L for use and waste of formwork to sides of column, pillars, posts, stanchions for rough finished surface complete all as specified and directed.

M&L for use and waste of formwork to sides and soffit of beams, lintels, cantilevers, shelves etc for rough finished surface complete all as specified and directed.

M&L for applying of high efficiency polymeric resin base film forming curing agent/compound over concrete surface (maximum coverage area 5.00 Sqm per litre as per manufacturers instruction) complete all as specified and directed. Make:- Concure LP90 of FOSROC or equivalents solutions SIKA/STP/ Maruti / Choksey chemicals as approved by GE.

M&L for providing and applying a flexible expansion joint membrane of minimum 150mm wide and 1mm thick, (Make: expoband one of FOSROC or equivalent as approved by GE)over the prepared joint using a two part epoxy adhesive (Make: nitobond PC 40 of Fosroc or equivalent as approved by GE). The minimum tensile strength of the membrane should be more than 12 N/mm2 and elongation at break should be more than 400%. The installation of the membrane should be carried out as per manufactures specification complete all as specified & directed.