REPAIR/MAINT OF OHT AND WATER SUPPLY MES INSTALLATIONS AT KV, ARJAN, 10 AFH, RS AND TIPNIS AREA AT AFS HASI MARA

Providing and fixing double scaffolding system (cup lock type) on the exterior side for high-rise building. made with 40mm dia M.S. tube at 1.5m center-to-center, joined with cup & lock system, including M.S. tube challies, M.S. clamps, staircases, anchoring to the building, safe working platform, maintenance, and safe removal after completion of work as approved by the Engineer-in-charge, complete all as specifed and directed.

Dismantling removing all unsound concrete, plastered material by chipping/chiseling gently at all effected and adjoining areas of concrete etc. till sound surface is reached all various locations in building (upto 30 M height of OHT) subsequently cleaning the surfaces by hair brush and air blower and removing rubbish off the premises and disposing at the dumping site as approved by local authorities, complete all as specifed and directed.

Removing of concrete all around reinforcement bar upto 12 mm dia and over from behind the reinforcement bars average 25mm (but not less than 15mm air gap) by manual methods (using wire brushing chiseling etc.) and applying chloride free rust removing chemical on rusting steel reinforcement bar and removing all rust from steel reinforcement bar by emery paper and cleaning the area thoroughly by water and allow it to dry and totally rust free of reinforcement bar all as complete as per manufacture’s instruction (upto 30M height of OHT), complete all as specifed and directed.

Material and Labour for preparation of existing reinforcement surface by brush and application of two component epoxy zinc rich primer on existing reinforcement surface of minimum specific gravity 1.75, adhesive bond strength with steel is 1.50N/mm2 and maximum coverage area 5.00 Sqm per litre (upto 30 M height of OHT), complete all as specified and directed.

Material and labour for introducing new reinforcement bars upto 12 mm dia and over for structural connection in RCC beams, columns, lintel and slabs including power drilling holes of appropriate diameters in reinforced or plain cement concrete to a minimum depth of 150rnm and upto 200mm including power drilling, fixing the reinforcement in position using epoxy, cleaning of loose dust by blowing air, sealing with epoxy cartridges etc. (upto 30 M height of OHT), complete all as specifed and directed.

Material and labour for supply, mixing and placement of micro-concrete cement based prepacked single component chloride free, sulphate free, non-shrink, free flow. elf compacting, ready to use after mixing water in specified proportion and in required thickness over a coat of epoxy resin bonding agent as per manufacture's instruction including necessary form work. Compressive strength (ASTMC 109, cm cube) of 50 MPa (Minimum) at 28 days including application curing compound concrete at various locations in Bldgs complete (upto 30 M height of OHT), complete all as specifed and directed.

Material and labour for providing and applying two component structural grade polymer modified reinforcement mortar upto a thickness of 30mm over a coat of epoxy resin bonding agent as per manufacture's specification. The cured mortar shall achieve a minimum compressive strength of 12N/mm2 in a day & 45 Nimm2 (Minimum) in 28 days with Flexural strength 8N/mm2 in 28 days Chloride diffusion coefficient shall be Nil after 24 hours when tested by Accelerated electrochemical chloride ion diffusion test method and the depth of carbonation shall be Nil after 24 hours when tested by Accelerated carbonation test, in addition to this percentage of water absorption should be 0.45 after 24 hours in immersion test at various locations in bldgs (upto 30 M height of OHT), complete all as specifed and directed.

Material and labour for application of high efficiency polymeric resin base film forming curing agent/compound over concrete surface with maximum coverage area 5.00 Sqm per litre or as per manufacturer's instruction (upto 30 M height of OHT), complete all as specifed and directed.

S&F shear connector of 8mm dia & requisite length on the surface to be repaired for the bonding between old and new concrete as per the locations as directed by the Engr-in-Charge. The shear connectors shall be of L shape and welded with existing reinforcement at least 100mm in length @ 200mm c/c both horizontally and vertically followed by coat of epoxy Zinc primer as per the specification mentioned (upto 30 M height of OHT), complete all as specified and directed.

M & L for providing and inserting mild steel shear key bars/levelling gauges of required length and diameter in reinforced/plain concrete for drilling suitable holes in RCC Slab/ wall column/ beams toa depth as directed for anchoring steel reinforcement bars including washing with water inserting lokfix 'E' of Fosroc or equivalent in the holes at various location in bldgs complete all as per manufacturer's specification (upto 30 M height of OHT), complete all as specified and directed.