SPECIAL REPAIR TO BLDG NO POR-1 AT VIJAY DURG UNDER GE(VD) KOLKATA

Chipping of existing plaster manually from masonary or concrete surface using chisel and hammer and disposal of debris out of MOD land and depositing where directed at a level n'exc 1.5m above the starting point etc complete including necessary scaffolding upto 04 storey High of building. complete all as specified and as directed by Engr-in-Charge ( upto 4 storey of building)

Chipping of unsound /weak concrete materials from slabs , beams,columns ,lintel,chajja, fin , facia etc.( Avg 30 mm thick ness for slab/Chajja ) by any means as directed by engr-in-charge including tapering all edges, making square shoulders of cavities air or sand blasting etc and cleaning of exposed concrete surface of lightly picking materials by air blasting or sand blasting incl foreign matrials , loose concrete/aggregate etc and disposal of all debris out of MOD land and complete all as specified and as directed by Engr-in-Charge . etc complete including necessary scaffolding upto 04 storey High of building. ( upto 4 storey of building) . upto 30mm average thickness for slabs/Chajja

All as per Item No 2.0 above but 50 mm average thickness for beams/Lintel.

All as per Item No 2.0 above but 60 mm average thickness for Column.

Add or deduct for every 10 mm thickness extra.

Removing of concrete all around reinforcement including from behind the reinforcing bars to give an average 25mm (but not less than 15mm clear air gap) by manual methods (using wire brushing ,chiselling etc) and applying alkaline rust removing chemical followed by removing rust including from behind the reinforcing bars by emery paper and cleaning the area throughly by water and allow it to dry all as per manufacturer,s instruction to give it a totally rust free finished steel surface including necessary scaffolding upto 04 storey High of building. complete all as specified and directed by Engr-in-charge ( Make : SIKA/FOSROC) upto 20 mm dia bar ( upto 4 storey of building)

M & L for providing single coat of epoxy bond adhesive of prepared non metallic surface (existing surface) and applying by brush all as per manufactures instruction/specification. The bonding agent shall have minimum compressive strength of 40 N/Sqmm and complete all as specified and directed by Engr-in-charge upto 4 storey

Supply and application of Epoxy Zinc rich primer on the prepared steel surface by brush the primer shall have a minimium specific gravity 1.75 minimum weight film thickness/coat 40 microns and minimum adhesive bond strength with steel is 1.5N/mm2 including necessary scaffolding upto 04 storey High of building complete all as specified and directed by Engr-in-charge. Make ; SIKA/FOSROC upto 4 storey High.

M & L for providing and placing in position free flow non shrink cementitious micro concrete of Grade of M-50 to the effected beam, column etc . The micro concrete shall have a minimium 1 day compressive strength of 10 Mpa and 28 days strength of 50 Mpa, minium tensile strength 5N/mm2 @ 28 days, minimium flextural strength 5N/mm2 @ 28days and including necessary scaffolding upto 04 storey High of building complete all as spd and dir by Engr-in-charge.( Make: SIKA/FOSROC/ELANTAS BECK/KUNAL CONCHEM) 60 mm average thickness of Column,upto 4 storey High.

M & L for providing and placing in position free flow non shrink cementitious micro concrete of Grade of M-50 to the effected beam, column etc . The micro concrete shall have a minimium 1 day compressive strength of 10 Mpa and 28 days strength of 50 Mpa, minium tensile strength 5N/mm2 @ 28 days, minimium flextural strength 5N/mm2 @ 28days and including necessary scaffolding upto 04 storey High of building complete all as spd and dir by Engr-in-charge.( Make: SIKA/FOSROC/ELANTAS BECK/KUNAL CONCHEM) 50 mm average thickness of Beam, upto 4 storey High.