Repairing, Retrofitting & Providing external protective painting work of IDCT 3 & 4 at GSECL Sikka TPS. (Phase-II).

Repairing / Rectification of damaged or deteriorated concrete of IDCT structures up to any height using scaffolding, winch, jhulas, tools tackles, etc. complete as directed. Following below mentioned repair methodology A) Chipping of loose concrete, exposing damaged steel bars, provide necessary cleaning with sweet water and prepare it for further treatment. B) Applying Alkaline Rust Converting Primer followed by Two coats of Migratory Bipolar Corrosion Inhibitor. C) Providing & applying Two coats of epoxy phenolic IP net-RB (CBRI Technology) over corroded steel bars to prevent it from further damage. Item shall include cost of material, tools & tackles, Labour, curing, etc. complete as directed by engineer I/c. The material can be used of Fosroc / Krishna Conchem / Redwop / SIKA / Pidilite / Fairmate / BASF as approved by EIC.

Providing & Placing high strength thixotropic repair mortar as per specifications for covering the damaged area in desired layer & thickness including application of approved epoxy latex bond coat of prior to application of repair mortar to ensure bond between old concrete & new repair system of Krishna conchem/ Fosroc/ Thermax/ Stanvac/ ChoksiComp/ k k agency etc. The item shall include cost of material, tools & tackles, Labour, curing, etc. complete as directed by engineer I/c.

Providing and laying polymer modified high strength free flow micro concrete jacket for the structure members e.g column pillars, piers beams etc. with characteristic compressive strength 45 to 60 N/sqmm with specified average thickness of 50 to 75 mm all around existing core of RCC member. Note:- rates shall be for finished surface area of concrete and shall include the cost of making holes in existing RCC slab if required for pouring concrete, shuttering mould of jackets and appropriate approved super-plasticizer for rendering concrete, epoxy bond coat, centering and shuttering, propping etc. (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).

Providing and fixing nozzles by drilling 15 mm dia drill bit of minimum 200 mm depth and fixing nylon/PVC nozzle of 12 mm dia using non shrink epoxy sealant EPCO 1010, providing and injecting low viscosity IPNET Resin system or equivalent (CBRI/CSIR Technology) of 190 cps into same nozzle with a pressure not less than 7 kg/ smt. Grouting is to be continued till the concrete matrix gets totally filled with grout. After grouting seal the nozzle using Epoxy Putty EPCO 1010 or equivalent includes men, material as per manufacture specification and required machineries, scaffolding, making working platform on and around the structure.

Providing TMT Bar FE 500D reinforcement for R.C.C. work including bending, binding and placing in position complete up to floor two level.

Providing and fixing of shear keys through prepacked epoxy system (HY 150 of Hilty make or equivalent) as per requirement including drilling holes of required dia., cleaning and fixing in RCC structural elements to be repaired/strengthened specially to columns for properly binding/confining additional reinforcement with existing reinforcement and concrete to have complete monolithic action inclusive of all labour, materials, equipment etc. complete at any height as per specification direction and approval of engineer in charge.

Providing and applying protective coating on external concrete surface of IDCT structures of unit 3&4 up to any height using scaffolding, winch, jhulas, tools tackles, labour, material and applying charges etc. complete as directed. Following below mentioned repair methodology will be adopted for cured the same as per manufacturer guidelines from Stanvac/ Fosroc/ thermax/ choksi comp/ Sikka/ Krishna Conchem/ k k agency etc. Total DFT shall be 300micrones. Surface preparation: - To clean the surface to remove the loose concrete from the surface by wire brush and cup- wheel grinder. Fresh water cleaning will be done to remove the salt contamination from the surface. Coating of the System: - Step - (1) - Over the cleaned surface apply 2 coat of sealer and allow to cure for 6 to 7 hour in each coat @ 50 micron DFT , as it will completely penetrate into the micro pores of the concrete and seals it permanently. Step-(2) - Over the cured surface apply 2 coat of standard Poly Urethane Top Coat having @ 100 micron DFT for each coat and allow the system for curing up to 12 hours. After two coat of Poly Urethane Top Coat it is insure that total DFT 200 micron should be required. The Rate is inclusive of all charges of material, labour, scaffolding etc. and it is completed as per directive of EIC. The guarantee period is 5.0 years.