Temporary Repair and Rehabilitation of Bridge No. 142/1 on NH-17 (New)/ NH-37 (Old) at Khanamukh under PWD, Guwahati NH Division, Guwahati under Contingency provision of Job No. TA/14/2021-22/264(2nd Call)

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 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.

Plastering the surface with high rich polymer modified mortar 10mm thick with cement sand mortar in prop 1:4 mixed with 100% acrylic polymer hydroproof extra of Fosroc chemical or master Emaco 131 of BASF or equivalent @15% by weight of cement followed by proper curing as specified and directed by the department complete including formwork

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/ 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.

Supplying, fitting and placing TMT IS:1786 (Fe 500) bar reinforcement in sub-structure complete as per drawing and technical specifications Super ductile (SD) TMT Reinforcement bar of Fe 500 N/ Sqmm

M/S. Prakalpa