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| 1 | Carriage of Building Rubbish with all lead and lift. The rates are inclusive of stacking, loading and unloading and transporatation etc. |
| 2 | Insertion of POWRTHROW of Make Krishna COnchem or equivalent, sustained release Corrosion inhibiting caplets which protect both anodic & cathodic sites and reduces Corrosion potential Ecorr by minimum 80 mV in conductive medium, by drilling 20 mm dia holes into the concrete at a depth of 30 mm at 500 mm c/c spacing using rotary hammer drill machine, cleaning the holes by air blowing and inserts to be filled by Putty of Make Krishna COnchem or equivalent. |
| 3 | Providing and fixing chemical rebars shear connectors as per drawing and at all heights as per EIC. using epoxy grout made with Epoxy resin and Hardner. (Hilti or equivalent ) For Jacketing of R.C.C. members as per specifications. The rate including scaffolding/ working platform/safety nets etc. which are required. Item includes Supplying, Drilling/Cleaning hole and injecting chemical. Application to be designed separately for Rebars as Simply Supported, Moment or Splice Connection as per EC2/TR 023 or relevant tested and accepted rebar guidelines. The chemical should have ETA approval for seismic rebar as a minimum qualifying criterion. Drilling hole with double flute type drill bits or hollow drill bits to the required depth by rotary hammer drill, cleaning with brush and jet of clean air, filling resin and hardener using serrated nozzle to eliminate mixing error with standard HDE A22 battery dispenser along with piston plug. The installation and the setting instructions should be strictly followed as per the manufacturer’s recommendations. The adequate diameter and embedment of rebars to be decided as per PROFIS / Designfix Rebar Software & the report to be submitted to the project manager/ design engineer for approval. Scanning before drilling to be done to avoid hitting existing rebars. Installation of chemical rebars shear connectors by using a static mixer provided which mixes in 3:1 ratio of resin to hardener and dispensing with the dispenser provided from Manufacturer and insertion of rebar into drilled hole by rotating in clockwise direction. |
| 4 | \\"Re 500 or equivalent -8mm dia 160mm depth |
| 5 | \\"Re 500 or equivalent -10 mm dia 200mm depth |
| 6 | Galvanic sacrificial Canodes for patch repairs by Point Canodes:Provide and install sacrificial zinc anodes of Make Fosroc / Krishna Conchem or equivalent to prevent initiation of corrosion of steel reinforcement in chloride-contaminated or carbonated concrete or new construction. Zinc mass should be Min. 60 g/unit or More and the zinc surface area and spacing of anodes should be selected/designed in a way to achieve the target service life of 25 or more Years. The quality of zinc should be in compliance with ASTM B418-95a, Type I, die-cast around steel tie-wires (in case of more than one tie wire they should be well seperated) and encased in a highly alkaline cementitious mortar (encapsulating mortar) with a pH of 14 or greater. The encapsulating mortar should not have sulphates, chlorides, bromides or any other elements corrosive to steel. The encapsulating mortar should have interconnected and fine pore structure to dissolve, transport and accommodate zinc corrosion products away from the zinc surface without causing additional stress to the cover concrete, and maintain a pH > 14 at the immediate vicinity of uncorroded zinc for the desired service life. Anode units shall be supplied with integral well-separated tie wires without splices (in case of more than one wire) and with loop ties for directly tying to the reinforcing steel. For patches in grid pattern or periphery of patches with 2 to 4 anodes/m2 (to be confirmed as per designed) area of concrete, the spacing can be 430 to 610 mm or as per manufacturer's specifications or designs. The anode size and shaping shall deliver a minimum current density to the steel adjacent to the repair of 0.4/0.8 mA/m2 (choose as per the chloride content) of steel surface area at the end of the design life based on the chloride level of <0.8% / 0.8-1.5% / >1.5% [choose as per the test results] by weight of cement taking into account an anode aging factor calculated from previous field installations and the in-service environment. Anodes should meet the target service life, which can be estimated using Galvanic Anode Performance (GAP) test developed at IIT Madras for severe exposure condition (high humid and high chloride conditions), GAP test results from IIT Madars/ Bombay shall be made availble by conntractor on his cost & no extra payment will paid for GAP test. |
| 7 | The Canodes shall be covered with Conductive bed-mortar of resistivity less than 50 kOhm-cm or similar to the parent concrete on the cleaned steel reinforcement as per manufacturers specification before applying passivation coating. All necessary design calculations for spacing of Canodes, installation training, installation confirmation, monitoring of set of anodes to confirm current from anodes as per ISO 12696 or as per the design, etc. shall be carried out by a NACE Certified CP Technician, CP2 or higher, complete at all heights and including of all materials, labour, tools, plants and machineries as directed by Engineer-in-charge and/or consultant.RATES INCLUDES Supply, installation, spacing calculation, designing, QAP, GAP test etc. Approved brand shall be from registered applicator. GAP Test should be performed on the cost of contractor. |
| 8 | Galvanic sacrificial Canodes for patch repairs by Point Canodes:Provide and install sacrificial zinc anodes of Make Fosroc / Krishna Conchem or equivalent to prevent initiation of corrosion of steel reinforcement in chloride-contaminated or carbonated concrete or new construction. Zinc mass should be Min. 115 g/unit or More and the zinc surface area and spacing of anodes should be selected/designed in a way to achieve the target service life of 25 or more Years. The quality of zinc should be in compliance with ASTM B418-95a, Type I, die-cast around steel tie-wires (in case of more than one tie wire they should be well seperated) and encased in a highly alkaline cementitious mortar (encapsulating mortar) with a pH of 14 or greater. The encapsulating mortar should not have sulphates, chlorides, bromides or any other elements corrosive to steel. The encapsulating mortar should have interconnected and fine pore structure to dissolve, transport and accommodate zinc corrosion products away from the zinc surface without causing additional stress to the cover concrete, and maintain a pH > 14 at the immediate vicinity of uncorroded zinc for the desired service life. Anode units shall be supplied with integral well-separated tie wires without splices (in case of more than one wire) and with loop ties for directly tying to the reinforcing steel. For patches in grid pattern or periphery of patches with 2 to 4 anodes/m2 (to be confirmed as per designed) area of concrete, the spacing can be 430 to 610 mm or as per manufacturer's specifications or designs. The anode size and shaping shall deliver a minimum current density to the steel adjacent to the repair of 0.4/0.8 mA/m2 (choose as per the chloride content) of steel surface area at the end of the design life based on the chloride level of <0.8% / 0.8-1.5% / >1.5% [choose as per the test results] by weight of cement taking into account an anode aging factor calculated from previous field installations and the in-service environment. Anodes should meet the target service life, which can be estimated using Galvanic Anode Performance (GAP) test developed at IIT Madras for severe exposure condition (high humid and high chloride conditions), GAP test results from IIT Madars/ Bombay shall be made availble by conntractor on his cost & no extra payment will paid for GAP test. |
| 9 | The Canodes shall be covered with Conductive bed-mortar of resistivity less than 50 kOhm-cm or similar to the parent concrete on the cleaned steel reinforcement as per manufacturers specification before applying passivation coating. All necessary design calculations for spacing of Canodes, installation training, installation confirmation, monitoring of set of anodes to confirm current from anodes as per ISO 12696 or as per the design, etc. shall be carried out by a NACE Certified CP Technician, CP2 or higher, complete at all heights and including of all materials, labour, tools, plants and machineries as directed by Engineer-in-charge and/or consultant.RATES INCLUDES Supply, installation, spacing calculation, designing, QAP, GAP test etc. Approved brand shall be from registered applicator. GAP Test should be performed on the cost of contractor. |
| 10 | Providing 230 GSM thick single layer Carbon fiber wrap of Make Fosroc/ Sika/ STP or equivalent for Slab, beams, columns with all height cup-lock saffolding after proper and adquate surface preparation by grinding on plane surface and rounding of edges in circular pattern in beams and columns, applcation of primer followed by epoxy putty layer upto 3 mm to level the surface, application of saturent with pesting of carbon fiber sheet. The FRP fabric used shall be of zero degree unidirectional fibers having fiber density of 1.8 g/cc and shall have tensile strength > 4900 MPa ; tensile modulous > 230 GPa and ultimate elongation of 2.1%. The substrate shall be primed with Nitowrap 30 or equivalent epoxy primer & Nitowrap 410 or equivalent impregnating resin saturant shall be used for saturating the fibers.Saturant used shall have tensile strength of >30 MPa; Elongation > 2% ; Flexural strength > 30 MPa ; Tensile Modulous > 2400 MPa & Flexural Modulous > 1700 MPa when tested as per ASTM D638 Type I and ASTM D 790 & Glass Transition Temperature > 50 deg Celcius as per ASTM E 1356.The adhesion of the entire system(FRP Sheet, Saturant and primer combined) with concrete shall be > 3.5 MPa with concrete failure as per ASTM D 4541. Wrapping the CFRP fabric to RCC member at desired orientation using tamping rollers to avoid any air voids etc. and after application of fibre wrapping, Quartz sand sprinkling to be done on the surface for bonding as per direction and satisfaction of Engineer-in-charge, etc, complete . Overlaping of two adjecent sheet shall be minimum 100 mm on either sides. Strip Grid design & wrapping method of fibre wrapping to be vetted from IIT with methodology. |
| 11 | Providing and fixing Carbon Fibre shear Anchors (Make Fosroc/Sika/STP or equivalent in CFRP works of 10 mm dia and 100 mm long (Including the covering of Anchors face by 100 x 100 mm piece of CFRP sheet pasting with saturant) of High strength hybrid woven fibre carbon fabric mesh with filling of hole with Epoxy Saturant or Equivalent, removing/ drawing out of the entrapped air etc. from the drilled hole all complete as per manufacturer's specifications and direction of Engineer in- charge. |
| 12 | Making of hole in R.C.C. slab/wall/beams and masonary wall (width up to 450 mm) by core cutting machine complete as per direction of EI, From diameter 50mm to 100mm all complete with T & P as per direction of EI. Please Enable Macros to View BoQ information |
