SPECIAL REPAIRS TO HANGAR FLOOR OF INS 551 P-166 AT INS DEGA UNDER GE ND, VISAKHAPATNAM

Material and labour for providing Epoxy Polyurethane (EPU) flooring comprising of the following all as specified and as directed and as per manufacturer's instructions:-

[a] Preparation of existing concrete floor surfaces mechanically by grinding or sand blasting or shot blasting or scarifying including wire brushing as required and removing all foreign matter, dust and debris etc by industrial vacuum cleaner followed by thorough water wash to obtain clean and sound substrate to ensure maximum bonding between the substrate and coating system including removing of all laitance, surface contamination, oil, grease, etc. by mechanical means or jet including finishing the surface to even and plain using suitable means to remove all imperfections complete all as specified as directed and as per manufacturer’s instructions. Notes: [i] Epoxy screed wherever required for treating the surface damages/ defects such as damage to joints, honey combing, blow holes, shrinkage cracks, etc. if any, found visible after preparation of surfaces shall be measured and paid separately under respective item o this Schedule / BoQ. [ii] Repairs to existing Expansion joints/ construction joints/ dummy joints shall be measured and paid separately under respective item of this Schedule / BoQ.

[b] Providing two component epoxy resin based primer comprising of base and hardener mixed and applied on prepared concrete surfaces using stiff brush or roller all as specified as directed and as per manufacturer’s instructions. Make : NITOPRIME 25 of FOSROC or equivalent approved make as specified in particular specifications Note: The primer shall be applied in two or more coats on porous concrete surfaces to achieve desired sound substrate surface.

[c] Providing 2mm thick high strength self smoothing underlay using three component system comprising of resin base, resin hardener and fillers, mixed and spread to uniform thickness over the primed surfaces using squeegee or notched trowel and subsequent use of spiked roller to eliminate air entrainment all as specified as directed and as per manufacturer’s instructions. Make : NITOFLOR -EU5 of FOSROC or equivalent approved make as specified in particular specifications Notes: [i] The underlay shall achieve compressive strength of 84 N/mm2, tensile strength 16 N/ mm2 , flexural strength 21 N/ mm2 conforming to BS 6319 and water absorption shall be NIL conforming to BS 1881. [ii] The Underlay shall be allowed to cure for 18-48 hours at 20°C before applying top coat. [iii] If the Underlay is allowed to cure more than 48 hours, then the underlay shall be thoroughly abraded and a fresh underlay shall be laid again without any extra cost to the department.

[d] Providing 2mm thick self smoothing epoxy polyurethane floor topping comprising of epoxy resin base & hardener, colouring paste, curing agents and graded inert aggregates, mixed and spread to uniform thickness using serrated trowel and rolled with spike roller to release any entrapped air and to achieve dense and impervious floor complete all as specified as directed and as per manufacturer’s instructions. Make : NITOFLOR -EPU2000 of FOSROC or equivalent approved make as specified in particular specifications Notes: [i] The floor topping shall achieve compressive strength of 45 N/mm2, tensile strength 10 N/ mm2 , flextural strength 15 N/ mm2 conforming to BS 6319, abrasion resistance 0.1-0.15 mg/ cycle - loss weight as per ASTM D 4060 and SHore D hardness 70-80 as per ASTM D 2240. [ii] The floor topping shall be allowed to cure for 7 days before allowing vehicular traffic

Material and Labour for repairs to existing floor cracks by widening the cracks by groove cutting to V-shape to a width of 0.25mm to 9mm and 10mm to 15mm depth including grinding both sides of groove and preparation of the surfaces mechanically by industrial vacuum cleaner/ blower to remove all foreign matter, dust and debris followed by thorough water wash to obtain clean and sound substrate and applying two components Epoxy based primer on the prepared grooves and allow it to dry and followed by application of three components solventless Epoxy repair mortar and applying three component epoxy putty complete all as specified and as directed and as per manufacturer’s instructions.

M & L for removing of the existing sealant from the Construction/Dummy joint grooves of size 15mm x 20mm, including preparation of the surfaces mechanically by industrial vacuum cleaner/ blower to remove all foreign matter, dust and debris, unsound or contaminated material, paste ,oil, paint, grease, corrosion deposits or algae and grease deposit and applying of two components epoxy based primer to the groove and filling the groove with three component solvent free epoxy based repair mortar and applying three component epoxy putty complete all as specified and as directed and as per manufacturer’s instructions.

M & L for removing of the existing sealant and backer rod from the Expansion joint grooves of size 25mm x 30mm, including preparation of the surfaces mechanically by industrial vacuum cleaner/ blower to remove all foreign matter, dust and debris, unsound or contaminated material, paste ,oil, paint, grease, corrosion deposits or algae and grease deposit and applying of two components epoxy based primer to the groove and inserting polyurethane foam strips as in backer rod/ de bonding strip in the groove and finally filling the groove with single component polyurethane elastomeric sealant complete all as specified and as directed and as per manufacturer’s instructions.

Material and Labour for levelling/ repairs to surface damages/ defects such as damage to joints, honey combing, blow holes, etc. in existing floor by providing three components solventless Epoxy repair mortar, mixed and spread to achieve required level and finish complete all as specified and as directed and as per manufacturer’s instructions.

M & L for two coats of painting with two component high build epoxy coat of approved colours, 200 microns thick, as in lines, etc., 100mm to 150mm width on newly finished floor top surfaces, to obtain glossy/ semi glossy finish of required colour, applied by brush or roller complete all as specified and as directed and as per manufacturer’s instructions.