M/o Office building under North Zone.

Chipping of unsound/weak concrete material 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 direction of Engineer-In-Charge a) 25mm average thickness

Chipping of unsound/weak concrete material 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 direction of Engineer-In-Charge a)50mm average thickness

Cleaning of reinforcement from rust from the reinforcing bars to give it a total rust free steel surface by using alkaline chemical rust remover of approved make with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washing with water and allowing it to dry, all complete as per direction of Engineer-In-Charge. A)Bars upto 12mm diameter

Providing, mixing and applying over reinforcement bars zinc anti-rust agent of make Fosroc/sika frizincr or equivalent as per specification and direction of Engineer-in-charge (Dosage/coverage as per the recommendation of the manufacturer. (Surface area of the chipped portion where reinforcement is exposed shall be measured for payment)

Centering and shuttering including strutting, propping etc. and removal of form for a)Suspended floors, roofs, landing, balconies and acess platform

Centering and shuttering including strutting, propping etc. and removal of form for a) Lintels, beams, plinth beams, girders, bressumers and cantilevers

Supplying and applying non-metallic composite Carbon fiber wrapping system Tyfo SCH14UP, BASF, SIKA, Krishna Conchem comprising of unidirectional fiber sheet 400 GSM (having dry fibre properties, modulus of elasticity not less than 240 GPa, tensile strength not less then 5800 MPa and density not less than 1.80 gm/cm3) and compatible saturant, including surface preparation by Grinding /moulding concrete, cleaning it with wire brush, removing oil, laitance etc.if present, rounding sharp edges to min 25mm. radius etc. complete, Profiling by applying compatible primer on prepared surface, filling the holes and uneven surfaces with thixotrophic putty etc. complete, wrapping the fiber sheet by tamping to avoid any air voids etc. i/c fixing with a required number of fiber anchors of minimum 10 mm diameter along the length of girder (both side) as per the drawing, driving and fixing the same upto minimum 75mm into parent concrete. Complete with respect to driving holes, cleaning with pressure air, and making them free of dust and dirt, fiber sheet reinforcement shall be saturated by not less then 1.25 kg/sqm of saturating resin. The same procedure shall be adopted for multiple layers with interval of 8 hrs between consecutive layers, rectifying air voids if any, pasting the river sand on it to make the surface rough to add any further finishes as per the specifications, design, and drawings and the direction of the Engineer-in-charge.

Providing and placing in position Micro-concrete, 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 approved manufacturer as per specification and direction of 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) Grade M25 as per direction of engineer-in-charge. (Micro concrete used to have a minimum solid polymer content of 6% by weight of cement for all hights) Readymade Micro-concrete.

Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 gradedcoarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-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/Sqmm2). a)25 mm average thickness in 2 layers.

Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 gradedcoarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-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/Sqmm2). a) 50 mm average thickness in 3 layers.