Repair work for beams of Boys hostel at JNV East Champaran (Bihar)

Chipping/grinding of existing concrete Carefully by low impact high frequency hammer without damaging the existing concrete including cleaning the surfaces by air blower etc. The rate is inclusive of all materials, labour,tools&tackels etc complete

Drilling and fixing Teflon nozzles in RC/PSC members including Drilling Holes (Drilling 12 mm dia., 40 mm deep holes in structural members at the intervals of 600 mm in staggered manner or as directed by the engineer-in-charge in RC/PSC structural element)and Cleaning of holes (To Clean the holes by air blower prior to fixing nozzles)and Fixing of Nozzles(To Insert 12 mm dia. Teflon nozzles in cleaned holes ). External end of nozzles to be machined to receive outlet of grouting gun and Fixing it inside the holes by applying thixotropic epoxy putty to ensure complete sealing and Curing the system for min. 12 hrs)and Cutting of Nozzles(To Cut the nozzles by chisel after completion of grouting without damaging structural elements) etc. Complete.

Injecting low viscosity (3-5 cps) high molecular weight monomer by pressure and using mechanized injector gun with accessories, till nozzles refuse to accept the grout Including Mixing of materials(Mixing material components (part a & b) in required quantities as per manufacturer’s instruction by weigh batching) and Grouting ( Filling the grouting gun with monomer. Maintain desired pressure in the gun by air compressor; maintain the pressure at exit (4 to 5 Kg/ Cm2) by monitoring pressure gauge at exit. Grouting the material through prefixed nozzles in the structural elements till its refusal. Sealing the nozzle with epoxy putty after the refusal. Monitoring leakages through other nozzles while grouting and sealing them as per the requirement. Repeat the process for all the nozzles. the operation to be within pot life of the material.)and Cleaning of gun and accessories ( the gun and accessories like valves, pipes and other fixtures to be cleaned with thinner after the operation to avoid jamming of the gun.) etc. complete.

Epoxy monotop by making groove of 10-20mm deep and 10 mm wide filled with epoxy mortar including complete leveling grinding and cleaning of cracks line .

Strengthening structural elements with nonmetallic composite fiber wrapping system comprise of unidirectional carbon fiber sheet (400 GSM) and compatible saturant, by wet layup system including surface preparation ( Grinding/Moulding concrete substrate, cleaning it with wire brush, removing oils, laitance if present, rounding sharp edges to min 25mm radius) etc. complete including Profiling, Applying compatible primer on prepared substrate, Filling the holes and uneven surface with thixotropic putty etc. complete, Mechanized wetting of fiber sheet: Cutting the fabric to required size. Mixing of saturant and filling in tub area of the saturation machine. Placing the fiber on metallic rods and pass through the rollers of machine and saturant tub ensuring complete wetting (65% fiber volume fraction) of fibers. Remove the fiber on rod and place the new fiber sheet. Wrapping: Wrapping the fiber sheet to structural element at desired orientation using tamping roller to avoid any air voids etc. repeat the same procedure for multiple layers with the interval of 8 hrs. Second Coat: Applying second coat of saturant after min. 12 hrs, rectify air voids if any. (Mode of measurement: Per sq.mt of carbon fiber sheet consumed and not surface area of application)

Providing and fixing carbon fiber anchors including drilling hole in the base concrete fixing the anchor using epoxy 50X55 system spreading the anchor fibers in star pattern including application of saturant etc. complete.

Providing & applying high strength Carbon Fiber Reinforced Polymer Composite Pultruded Plates with a Tensile Strength of 2800MPa of 1.4 mm thickness and 100 mm width. (Mode of measurement: Per running Mt.laminate applied). Including 100% solvent free epoxy resin based Adhesive flexural Strength conforming to IS 4456 (Part 1) greater than 25 MPa Bond strength conforming to ASTM D 4541 used for bonding high strength Carbon Fiber Reinforced Polymer Composite pultruded Plates to the well prepared concrete substrate.

Anchor Plates for stressed laminate Providing and Fixing in position Anchor plates made up of high grade Aluminium for Pre- stressed and Nonprestressed including drilling holes in concrete surface and fixing mechanical anchor bolt or equivalent, to fix the Plates.