SPECIAL REPAIR TO DISPERSAL AT INS DEGA AIRFIELD UNDER GE ND VISAKHAPATNAM

Amount

Schedule 'A' Part -I (B/R)

Demolition of un- reinforced cement concrete in ground floors and paving not exceeding 15 cm thickness. (Below or above ground level)

M & L for providing plain cement concrete, type B-2, 1:2:4 (using 40 mm graded stone aggregate) as in foundation, filling and mass concrete complete all as specified and directed.

M&L for Cement concrete 100mm thick type B-2 (1:2:4) using 40mm graded stone aggregate as in hard standing and paving etc. all as specified & directed.

M&L for Sand filling under floors or in foundations including watering and consolidation complete

Supplying and laying 400micron thick HDPE sheet (Virgin Quality ) water proof, wrinkle free without puncture having minimum weight 390 gm/Sqm over tack coat /sand cushion as specified in the design with overlap between adjacent strips and at transverse joints as minimum 300mm.

M&L for Pavement Quality concrete (PQC) of minimum 28 days field flexural strength of 45 Kg/Sqcm or 4.5 Mpa, aggregate gradation as per Table 3 of IRC 15-2017, coarse aggregate of clean, hard strong, dense, non-porous and durable pieces of crushed stone or gravel, fine aggregates of clean natural sand or crushed stone sand or combination of both using minimum 360 Kg/Cum of cement with non-circular, virgin synthetic fibre of 12-18 mm length, specific gravity 1.34 to 1.39, UV stable, alkali resistant, with equivalent dia 15-40 micron, minimum melting temperature as 240 C and minimum tensile strength of 300 Mpa and at the rate as specified by the manufacturer. PQC laid, spread and compacted with mechanical means including curing and tining by texturing cum curing machine complete all as specified and directed. Required surface texturing to be done as specified in clause 10.1.14 and table 9 of IRC 15-2017 complete all as specified and directed.

M&L for repairs to existing floor cracks by widening the cracks by groove cutting to V-shape to a width of 0.25mm to 9 mm and 10-15 mm depth including preparation of surfaces mechanically by industrial vacuum cleaner / blower to remove all foreign matter, dust and debris followed by through 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 component solventless Epoxy repair mortar and applying 3-4 mm thick three components epoxy putty complete as specified and directed and manufacturer's instructions.

M & L for levelling and grinding the rigid concrete surfaces by mechanical means sweeping, cleaning with compressed air blower so as to make the surface free from dust, oils, cement dead mortar, etc and removal debris up to a distance exceeding 250m and not exc 500m and applying 15 to 20mm thick three component epoxy mortar Sika Dur41 or its equivalent complete all as per manufacturers instructions and as directed by the Engineer-in-Charge. [Make: Sika India Pvt Ltd / Fosroc Chemicals / STP Ltd / Choksey Chemicals Pvt Ltd / Thermax Ltd / Hindcon Chemicals Ltd / Maruthi Bitumen Pvt Ltd / Bostik India Pvt Ltd].

M&L for racking out old existing sealant compound and back up rod of the existing joints by special tools like cutting blades / machines, widening of joints by 2 mm by using joint cutting blades of appropriate size, straight and smooth edges. Joint cleaned thoroughly with application of compressed air. Joint shall be made dry, vacuum cleaned and free of dirt, oil, vegetation and other debris. Application of two coats of primer with thin brush by forward and backward movement at an interval of 30 minutes before pouring the sealant. Thereafter filled closed cell, medium density, cross linked polyethylene foam backup rod of 12mm dia for complete length of the joint, over it to be filled with polyurethane joint sealant meeting the requirement mentioned in BS-5212, BS 4254 and EN-141875-2003 with minimum movement accommodation factor MAF of +/- 30% complete all as specified and directed.

M&L for racking out old existing sealant compound and back up rod of the existing joints by special tools like cutting blades / machines, widening of joints by 2 mm by using joint cutting blades of appropriate size, straight and smooth edges. Joint cleaned thoroughly with application of compressed air. Joint shall be made dry, vacuum cleaned and free of dirt, oil, vegetation and other debris. Application of two coats of primer with thin brush by forward and backward movement at an interval of 30 minutes before placing the filler board and pouring the sealant. Thereafter filled with pre-molded 25 mm thick compressible polyethylene closed cell type filler board as specified, over it filled with closed cell, medium density, cross linked polyethylene foam backup rod of 30mm dia for complete length of the joint. Finally filled with polyurethane joint sealant meeting the requirement mentioned in BS 5212, BS 4254 and EN-141875-2003 with minimum movement accommodation factor MAF of +/- 30% complete all as specified and directed.

M&L for preparation of surfaces of taxiway Marking and turning pads of Dispersal without damaging the surface and maintaining the texture and surface condition of the pavement intact and painting lines Dashes, Arrows, letters etc and the like exceeding 10cm width or girth [Retro Reflective Type]of colour yellow with white or Black Borders, Cold applied type, applied by skilled painter/ applicator of wet film thickness of 400 microns coat dry film thickness of 200 micron and coverage @ 0.4 to 0.5 litres per sqm and application of drop on glass beads type IV [Reflective Index 1.5] @ 350grams per sqm complete all as specified and directed.

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Sri Krishna Enterprises

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