Reconstruction of Taxiway B in between Taxiway A and RWY 19R 01L at NSCBI Airport Kolkata

Amount

Dismantling of flexible pavement (bituminous courses) by mechanical means and disposal of dismantled material within airport premises, as per direction of Engineer-in-charge.

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

Demolishing cement concrete manually/ by mechanical means including disposal of material within airport premises as per direction of Engineer - in - charge. (b) Nominal concrete 1:4:8 or leaner mix (i/c equivalent design mix)

Demolishing dry brick pitching in floors, drains etc including stacking of serviceable material and disposal of unserviceable material within airport premises.

Excavation in soil with hydraulic excavator including cutting and loading in tippers, trimming of bottom and side slopes, in accordance with requirements of lines, grades and cross section and transporting, unloading and spreading evenly the surplus soil as per required slope within all lifts and lead upto 1.00 km complete as per directions of Engineer-in-Charge.

Consolidation of sub grade with power road roller of 8 to 12 tonne capacity including making good the undulations etc. with earth or quarry spoils etc. and re-rolling the sub grade.

Supplying and filling in plinth with sand under floors, including watering, ramming, consolidating and dressing complete.

Providing and laying graded granular material (moorum) in layers not exceeding 20 cm (compacted) in thickness including breaking clods, watering and consolidating each layer with vibratory road roller of minimum 80 to 100 KN static weight with plain drum, under optimum moisture content (+1% to -2% of the OMC) to give density not less than 95% of the maximum modified standard proctor density including leveling, fine dressing to the required camber, grade and slope etc. complete as directed by Engineer-in-Charge( payment to be made for the compacted quantity only). Note: The moorum shall meet the specifications as per MORT&H (Ministry of Road Transport & Highway) and the material passing 425 micron (0.425mm) sieve, when tested according to IS:2720 (Part-5) shall have liquid limit and plasticity index not more than 25 and 6 percent respectively.

Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : 1:3:6 (1 Cement : 3 coarse sand (zone-III) derived from natural sources : 6 graded stone aggregate 40 mm nominal size derived from natural sources) as per MORTH S.no.9.1, all complete as per direction of Engineer-in-Charge.

Construction of dry lean cement concrete Sub- base over a prepared sub-grade with coarse and fine aggregate conforming to IS: 383, the size of coarse aggregate not exceeding 25 mm, aggregate cement ratio not to exceed 15:1, aggregate gradation after blending to be as per table 600-1, cement content not to be less than 150 kg/ cum, optimum moisture content to be determined during trial length construction, concrete strength not to be less than 10 Mpa at 7 days, mixed in a batching plant, transported to site, laid with a paver with electronic sensor, compacting with 8-10 tonnes vibratory roller, finishing and curing, all complete as per clause 601 of MORT&H.

Providing and laying Pavement Quality Concrete (PQC) produced in a batching and mixing plant having a Characteristic flexural strength i.e. flexural strength of 4.1MPa at 28 days using Portland Pozzolana Cement conforming as per relevant IS codes, to be mixed at site, with 0.5% Super plasticizer by mass of cementitious material, fine aggregate, graded stone aggregates of 40 mm nominal size in appropriate proportion as per specification and job mix formula, laid in panels as per drawings/design as approved by the Engineer-In-Charge using Slip Form Paver or Fixed form paver including anti friction layer, joint filler board, making necessary provision for expansion, dummy and construction joint including filling with Polysulphide sealant of approved make, curing and making profile, complete as per direction of Engineer-in-Charge and specifications. The item for execution shall include all operations making pavement for intended use but not limited to following: (i) Polyethylene sheet (White in color) of thickness 400 micron conforming to IS: 2508 with 6mm thick fine sand layer. (ii) Providing and laying in position for expansion joint, 25mm thick pre-cut Synthetic joint filler board of approved make conforming to IS:1838(part 3)-2011, 45 mm from top (to be removed at the time of filling of Polysulphide sealant). (iii) Mechanically cutting dummy joints 3mm wide x 1/3rd thickness of slab which is subsequently widened to 10mm for the top 25mm depth and construction joints 10mm wide x 25mm deep as per specification. Providing and laying in position Polysulphide sealant of approved make conforming to BS-5212-1990 or IS: 11433-1995 in expansion/ construction / dummy joints including rounding off edges, applying 2 coats of approved primer compatible with the brand of Polysulphide and preparing the surface and applying masking tape along the edge of joint to prevent accidental spillage of sealant on top surface and to give neat finish to the sealant and removing the masking tape after application of sealant etc. as per the details below: (a) Expansion Joints of size 25 mm wide and 10 mm deep over 30mm dia expanded closed-cell Polyethylene foam back-up/backer rod of minimum density 22 Kg/Cum, as per manufacturer’s specifications and sketch. (b) Construction Joints of size 10 mm wide and 10 mm deep over 12mm dia expanded closed-cell Polyethylene foam back-up/backer rod of minimum density 22 Kg/Cum, as per manufacturer’s specifications and sketch. (c) Dummy Joints of size 10 mm wide and 10 mm deep over 12 mm dia expanded closed-cell Polyethylene foam back-up/backer rod of minimum density 22 Kg/Cum, as per manufacturer’s specifications and sketch. (iv) Making profile as per DGCA CAR, panel drawing showing dummy, construction, expansion joints location. Note: (i) Areas inaccessible to paving equipment shall be constructed by manual/hand guided method. Areas in which manual/hand guided methods of construction become indispensable shall be got approved by the Engineer-in-Charge in writing in advance. (ii) The quantity of cement, type of cement and super plasticizer for one Cum. of finished concrete specified are for tendering purpose only. The contractor shall quote his rates assuming quantity of Portland Pozzolana Cement as 400 Kg cement. In addition, if the actual quantity of cement & super plasticizer required as per laboratory mix design varies from the quantity assumed above, necessary cost adjustment for deviation in the quantity of cement and super plasticizer as per mix design, if any, shall be done as per the rate of cement and super plasticizer in actual supply voucher from manufacturer/authorized dealer whichever is minimum at the time of execution. In the case of authorized distributor, the rate may be authenticated by the manufacturer. The rate of cement and super plasticizer exclusive of GST shall only be considered for payment.

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 ail dirt, scales, oil, grease and other foreign material etc. and lining out complete. a) New work (Two or more coats)

Conducting necessary test to determine k-value [(Modulus of subgrade reaction) and determination of field density, moisture content and assesing the k-value after meeting necessary correction of saturation of soil in field as per IS 9214-1976 (reaffirmed 1987) with 75 cm dia circular plate] i/c submission of Soil Report of each assignment as directed by Engineer-in-Charge. The Test Report should be vetted by Govt. Engg. College.

Credit item for disposal of Excavated earth (Mixed with dismantled pavement rubbish) outside of airport premises all complete as per the direction of Engineer-In-Charge. Note:- The contractor has to quote not less than Rs. 87.00

PABSCON