Special repair of runway and taxiway Sub Head Repair and Rehabilitation of Runways, Taxiways and Apron for compliance of DGCA Observations and Operational requirements

Amount

Providing and applying tack coat using suitable low viscosity paving bitumen of VG 30 grade conforming to IS:73, spraying the bitumen with mechanically operated spray unit at the rate specified below, cleaning and preparing the existing pavement surface as per specifications complete in all respects as per direction of Engineer-In-Charge. If the actual quantity of bitumen varies from the quantity specified, necessary cost adjustment for deviation in the quantity of bitumen shall be done as per rate in actual supply voucher from nearest refinery at the time of execution. The rate of bitumen exclusive of GST shall only be considered for payment. a) 0.20 Kg/Sqm on existing bituminous surface

Providing and applying tack coat using suitable low viscosity paving bitumen of VG 30 grade conforming to IS:73, spraying the bitumen with mechanically operated spray unit at the rate specified below, cleaning and preparing the existing pavement surface as per specifications complete in all respects as per direction of Engineer-In-Charge. If the actual quantity of bitumen varies from the quantity specified, necessary cost adjustment for deviation in the quantity of bitumen shall be done as per rate in actual supply voucher from nearest refinery at the time of execution. The rate of bitumen exclusive of GST shall only be considered for payment. b) 0.30 Kg/Sqm on existing concrete surface

Providing and laying in position Composite Glass Grid paving mat (Glass pave 25 or equivalent to meet the requirements of EN 15381) as per technical specifications over cleaned bituminous surfaces immediately after application of tack coat @ 0.7 Ltr/Sqm with overlaps at end to end roll joints of 150 mm and overlap in longitudinal joints of 50 mm as required as per direction of Engineer -In -Charge. (Note : Tack coat below glass pave 25 or equivalent included in this item)

Providing and laying of Hot Mix Semi Dense Asphaltic Concrete (SDAC) using crushed stone aggregate of quality, size and grading as specified and 2% cement by weight of aggregates as filler and Viscosity Grade Bitumen(supplied in bulk) in proportions as perjob mix formula and laid to specified levels, grade and camber as per specification, drawings and as directed by the Engineer-in-Charge including compacting with 8-10 tonne, preferably vibratory road roller of adequate capacity to achieve the specified values of compaction, strength, surface accuracy complete [for tendering purpose VG bitumen of grade VG-30 content shall be taken as 120 kg/m3 of mix supplied in bulk produced by Govt. Refineries and 2% cement by weight of aggregates as filler material].

Providing and laying of Hot Mix Dense Asphaltic Concrete (DAC) using crushed stone aggregate of quality, size and grading as specified and 2% cement by weight of aggregates as filler of quality as specified and Viscosity Grade Bitumen (supplied in bulk) in proportions as per job mix formula and laid to specified levels, grade and camber as per specification, drawings and as directed by the Engineer-in-Charge including compacting with 8-10 tonne, preferably vibratory road roller of adequate capacity to achieve the specified values of compaction, strength, surface accuracy complete [for tendering purpose VG bitumen of grade VG-30 content shall be taken as 135 kg/m3 of mix supplied in bulk produced by Govt. Refineries and 2% cement by weight of aggregates as filler material].

Cutting the existing bituminous pavement concrete of runway upto required depth by milling machine with coveyor belt attachment and loading in tippers including disposal of materials(mechanically) within Airport Premises etc as directed by the Engg-in Charge.

Painting runway/taxi track/apron marking with adequate nos of coats to give uniform finish with road marking paint of superior make as approved by the Engineer-in-Charge, including cleaning the surface of all dirt, scales, oil, grease and other foreign material etc, and lining out complete, a) New work (Two or more coats)

Demolishing cement concrete manually/ by mechanical means including disposal of material within 50 meters lead as per direction of Engineer - in - charge. Nominal concrete 1:3:6 or richer mix (i/c equivalent design mix)