Cachar/MMPNA/R_R/01 Repair and Rehabilitation of bridge located at Kabuganj (NH-54) Palanghat Amraghat Motinagar Amjur (SMD road) Road (Kabuganj (NH-54)-Amjur Tiniali) at Ch.13.453 km under Mukhya Mantrir Path Nabikaran Achani (MMPNA) for the year 20

Amount

Chipping of deteriorated concrete and removal of all loose & friable materials and fully exposing rusted reinforcement followed by proper cleaning and removing of rusts and other foreign materials using sand blasting/ emery cloths/ wire brush etc. including formwork as directed and specified by the department complete

Replacement of corroded reinforcement by cutting and welding new reinforcement of minimum 25mm dia. including lapping on both sides to the specified length as directed and as per relevant IS/IRC codes and cost of gas ,welding rods,higher charge of welding machines etc. including formwork as required.(Reinforcement to be measured and paid seperately)

Supplying and applying two coats of zinc rich anti corrosive protective coating with nitozinc primer of fosroc or equivalent @0.20 Litre per sqm over thoroughly cleaned & prepared steel bar including formwork as directed and specified by the department complete

Supplying and applying Epoxy based bonding agent Nitobond EP of Fosroc Chemicals or Masterbrace 1414 of BASF /Rearmbond EBA or equivalent @ 0.50 Lit pe sqm after totally saturating the cleaned concrete surface with clean water for proper bonding of old and new concrete including formwork as specified and directed by the department complete.

Patching of damaged concrete surface with structural grade polymer modified reinstatement mortar to like Fosroc Renderoc S2 /Rearm crete RMHS or equivalent at a thickness of 10 to 20 mm as per instruction of manufracturer and as approved by the engineer . The prepacked repair mortar should have a compressive strength 45 N/Sqmm, Flexture strength 8 N/ Sqmm at 28 Days

'Repair of joint Grooves with Epoxy Mortar Repair of spalled joint grooves of contraction joints, longitudinal joints and expansion joints in concrete pavements using epoxy mortar or epoxy concrete)

Providing & fixing 16mm dia MS nozzles in a grid of 1m c/c up to the half of the thickness of the concrete structure.A grout slurry of neat cement & chloride free expanding grout cebex 100 of Fosroc Chemicals/ Mastergrout CPG-1 of Choksey Chemicals/ Armgrout additive of Myk arment/Masterflow 150 of BASF or equivalent @ 0.5% by weight of cement water cement ratio 0.35 to 0.40 and viscosity not more than 1.02 centipoise with grouting pressure till the refusal of injection grout Mastergrout CPG-1. The grouting operation pressure shall be 2Kg/sq.cm.Cutting the exposed nozzle after the grouting with a good cutter to make the surface free from the grouting pipes and to seal the gap with plugging compound Masterplug of Choksey Chemicals as per the specification and the direction of the department complete including formwork.

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per Technical specifications including subsequent cutting/removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy.

Sealing of crack / porous concrete with Epoxy Grout by injection through nipples complete as per clause 2803.1.

Concreting of the structure with free flow nonshrink cementitious microconcrete with Rendorec RG of Fosroc/Rearmcrete MC or equivalent after proper mixing with cleanwater including formwork followed by proper curing for 28 days as per manufacturer's specifications complete and as directed by the Department .

Structural Strengthening with carbon Fibre:Patching in depression of concrete surface wherever necessary by laying epoxy putty , Nitocote VF of Fosroc Chemicals or equivalent @ 1 Lit per sqm after proper surface preparation and proper scraping of concrete protrusion as specified and directed by the department complete including formwork .

Structural Strengthening with carbon Fibre: Applying Nitowrap 410 saturant Fosroc Chemicals or equivalent with wet film thickness @ 250 microns (0.27Lit per sqm) over a coat of saturant epoxy primer Nitowrap 30 of Fosroc Chemicals or equivalent @ 0.11Lit per sqm with brush followed by fixing carbon fibre composite system Nitowrap EP (CF) of Fosroc Chemicals or equivalent by pressing on the saturant and impregnate the same by applying a final coat of Nitowrap 410 saturant Fosroc Chemicals or equivalent as specified and directed by the department complete including formwork.

Structural Strengthening with carbon Fibre: Applying two coats of UV resistant coating Nitowrap 512 of Fosroc Chemicals or equivalent over fibre system having wet film thickness of 100 micron @ 0.11Lit per sqm as specified and directed by the department complete including formwork.

Providing and applying Dekguard E2000 or Masterseal 878 of BASF or Rearmcoat anticarb or equivalent a high performance anticarbonation protective coating system,over the primed surface using an airless sprey or roller at right angle to each other @ covarage 5 Sqm per litre per coat @200 micron wft/100 micron DFT with an intercoat period of minimum 12 hours @35ºC. The covarage per litre for two coat shall be 2.5 Sqm @200 micron DFT. The protective coating system should have Co2 diffusion resistance not less than 240 mm equivalent of air thickness and 60 cm equivalent of 30 N concrete along with water vapour transmission resistance of less than 1m (taywood method), the coating should have static crack accomodation of not less than 2mm (BRE) and adhesion greater than 1 N/sqmm as per BS 1881

Supplying and fixing of rebaring chemicals Fosroc Lokfix E55 S-venylester chemical anchor grout or equivalent for various diameter of reinforcement bar at provided embedment depth as per manufracturer specification and instructions for use in concrete applications as directed by engineer in charge a) 8 mm dia re-bar fastners.

Supplying and fixing of rebaring chemicals Fosroc Lokfix E55 S-venylester chemical anchor grout or equivalent for various diameter of reinforcement bar at provided embedment depth as per manufracturer specification and instructions for use in concrete applications as directed by engineer in charge a) 8 mm dia re-bar fastners C) 12 mm dia re-bar fastners.

Replacement of Expansion Joints complete as per drawings

'Strip Seal Expansion Joint (Providing and laying of a strip seal expansion joint catering to maximum horizontal movement upto 70 mm, complete as per approved drawings and standard specifications to be installed by the manufacturer/supplier or their authorised representative ensuring compliance to the manufacturer's instruction for installation).

Greasing of Bearing with ULTRATACK AP3 grease including cleaeing of bearings with steel brush, removal of dusts and dirt with necessary scaffolding etc. complete as directed by the department.

Dismantling of Cement Concrete Pavement (Dismantling of cement concrete pavement by mechanical means using pneumatic tools, breaking to pieces not exceeding 0.02 cum in volume and stock piling at designated locations and disposal of dismantled materials up to a lead of 1000metres ,stacking serviceable materials and unserviceable materials separately.)

Cement Concrete Pavement (Construction of un-reinforced, dowel jointed, plain cement concrete pavement over a prepared sub base with 43 grade cement @ 400 kg per cum, coarse and fine aggregate conforming to IS 383, maximum size of coarse aggregate not exceeding 25 mm, mixed with Recron 3S fibre of Reliance Industries Ltd. or its equivalent @ 0.125 Kg. per bag of cement mixed in a batching and mixing plant as per approved mixed design, transported to the site, laid with a fixed form or slip form paver, spread , compacted and finished in a continuous operation includuing provision of contraction, expansion, construction and longitudinal joints, joint filler, seperation membrane, sealent primer, sealent joint , debonding strips dowel bar, tie rod, admixured as approved, curing compopund, finishing to lines and grades as per drawing. (Including carriage of mixed materials up to 10.0 Km initial lead from mixing plant.) as diected by the Department complete at all levels.

Supplying, fitting and placing TMT IS:1786 (Fe 500) bar reinforcement in sub-structure complete as per drawing and technical specifications TMT CRS(Fe 500) reinforcement bar

Replacement of damaged concrete railing.

Construction of RCC railing of M30 Grade in-situ with 20 mm nominal size aggregate, true to line and grade, tolurence of vertical RCC post not to exceed 1 in 500, centre to centre spacing between vertical post not to exceed 2000 mm, leaving adequat space between vertical posts for expansion, complete as per approved drawings and technical specifications.

Painting on concrete surface (Providing and applying 2 coats of water based cement paint to unplastered concrete surface after cleaning the surface of dirt, dust, oil, grease, efflorescence and applying paint @ of 1 litre for 2 Sq.m. B)For RCC Railing

Non-destuctive testing with Ultrasonic Pulse Velocity Meter with data storage facility for detection of cracks, voids and other imperfections in Reinforced concrete structures and furnishing the findings thereof in proper comprehensible format , complete as directed by the department.

Conducting Concrete Core tests of 75mm diacores, on concrete stucture, as per stipulated procedures, for determination the equivalent cube compressive strength, concrete of the structures including preparation and furnishing the report showing the findings thereof in proper comprehensible format , complete as directed by the department.