REPAIR/MAINTENANCE OF CERTAIN RUNWAY RELATED WORKS AT AIR FORCE STATION TEZPUR UNDER GE (AF) TEZPUR.

Amount

Materials and Labour for, raking out existing joint sealant from expansion joints with using appropriate tools and mechanical means for joints of size 20-25 mm wide and 20 mm deep of sealant including taking out compressible backer rod of dia 25-30 mm (Total depth 45-50 mm) from joints, cleaning the joints of sides, bottom and removing the loose particles of sealant dust etc., with suitable tools and mechanical driven machine, drying the joints surface of moisture completely by means of mechanical driven air blower,applying masking tape both sides of edges of joints to prevent accidental spillage of sealant, applying one coat of primer and insert compressible cross linked polyurethane form back-up rod, closed cell, medium density of appropriate dia as per site condition, putting in polyurethane joint sealant of approved make in joints as per manufacturer's instruction, removing masking tape after application of sealant joint and cleaning the surface,complete all as specified and as directed.

Materials and Labour for, raking out existing joint sealant from Construction/ Dummy joints with using appropriate tools and mechanical means for joints of size 10-12 mm wide and 10 mm deep of sealant,including taking out compressible backer rod of dia 12-15 mm (Total depth 22-25 mm) from joints, cleaning the joints of side, bottom and removing the loose particle of sealant dust etc, with suitable tools and mechanical driven machine, drying the joints surface of moisture completely by means of mechanical driven air blower,applying masking tape both sides of edges of joints to prevent accidental spillage of sealant,applying one coat of primer and insert compressible cross linked polyurethane form back up rod, closed cell, medium density of appropriate dia as per site condition, putting in polyurethane joint sealant of approved make in joints as per manufacturer's instruction, removing masking tape after application of sealant joint and cleaning the surface,complete all as specified and as directed.

Materials and Labour for,raking out existing cracks on surfaces of rigid/flexible pavement (concrete or asphaltic) of runway,taxi track,links etc.cleaning the cracks from sides, bottom and removing the loose particle of sealant dust etc, with suitable tools and mechanical driven machine, drying the cracks surface of moisture completely by means of mechanical driven air blower and repair by putting in elastomeric,self-leveling sealant impregenated rope of size ¼ inches thick,melted with direct heat process, finished true levelled with existing adjoining pavement surface as per manufacturer's instructions,complete all as specified and directed.

Materials and Labour for,raking out existing cracks on surfaces of rigid/flexible pavement (concrete or asphaltic) of runway,taxi track,links etc.cleaning the cracks from sides, bottom and removing the loose particle of dust,dirt etc,with suitable tools and mechanical driven machine,drying the cracks surface of moisture completely by means of mechanical driven air blower and repair to crack by putting in elastomeric,self-leveling sealant crack filler rope of size ½ inches thick,melted with direct heat process, finished true levelled with existing adjoining pavement surface,as per manufacturer's instructions,complete all as specified and directed. Notes:- (Applicable for BOQ Serial Item No 3 & 4). (i) The sealant rope shall be designed to be inserted into the crack or joint cavity first and then melted with direct heat process.The modifier system contained in the sealant rope shall allow the material to withstand direct heat without experiencing degradation. (ii)The crack filler shall combine tenacious adhesive power with resiliency to protect against the infiltration of moisture or incompressible through repeated thermal cycles of expansion and contraction.It shall exhibit superior low temperature ductility, weather resistance, low oxidation breakdown and non-tracking. (iii) Repair to cracks shall be executed as per manufacturer’s instructions and shall be executed by the approved and trained applicator of manufacturer.

Materials and Labour for, racking/cutting out defective portion of existing rigid pavement with the help of mechanical means/manually chiseling, making regular size,depth not less than 25 mm from top surface of slab, removing all debries, loose particle cleanining throughly the surface by means of air blower,applying a coat of primer uniformly on the horizontal and vertical faces with bristle brush, pouring in pre-mixed elastomeric concrete (self levelling) on primed surface and finishing by means of trowels and flats, complete all as specified and directed. Notes:- (i) The surface to be finished true levelled with existing adjoining rigid pavement. (ii) Mixing of materials for elastromeric concrete shall be strictly as per manufacturer's instructions.

Materials and Labour for,preparing black top surfaces by brushing with wire brushes for removing,foreign particles,vegetations etc. sweeping with brooms and finally fanning the cleaned surface with mechanical blower to remove all loose dirt,foreign particles etc.including applying polymer modified bitumen emulsion using 0.30 Liter of PMBE mixed with water in ratio (1:1) per square metre of surface area as per manufacturer's instructions,complete all as specified and directed. Notes:- (i) All pores,pin/pot holes of depth upto 25 mm and superficial area not exceeding 491 sqmm on the flexible pavement surface to be applied PMBE shall be repaired by putting in premix Dense Asphaltic Concrete (DAC),Gde-II, with 6% binder content (Polymer Modified Bitumen,PMB-40) prior to application of the emulsion. (ii) PMBE shall be applied by a self-propelled or towed pressure sprayer equipped for spraying the material uniformly at the specified rate as per manufacturer's reccommendations. (iii) Application of PMBE shall be executed as per manufacturer’s instructions and shall be executed by the approved and trained applicator of manufacturer. (iv) Suitable care shall be taken to avoid spraying of PMBE over existing runway paintings/ markings,fittings & fixtures,any damage caused due to accidental spraying of PMBE over the same shall be made good by the contractor without any extra cost to the Govt.

Materials and Labour for preparation of old painted surfaces of rigid/flexible pavement (concrete or asphaltic) of runway,taxi track,links etc., painting lines, dashes, arrows, figures, letters, etc. on roads, pavements and the like exceeding 10cm wide with one coat of water based acrylic paint (white/ golden/ yellow/orange) as per manufacturer's instructions,complete all as specified and directed.

Materials and Labour for preparation of old painted surfaces of rigid/flexible pavement (concrete or asphaltic) of runway,taxi track,links etc., painting lines, dashes, arrows, figures, letters,etc. on roads pavements and the like not exceeding 10cm wide with one coat of water based acrylic paint (white/ golden/ yellow/orange) as per manufacturer's instructions,complete all as specified and directed.

Clearing shrubs,vegetation,grass,bush,weed etc. from sides of runway, PTT, Links and Dispersal Area,including disposal of rubbish/ useless materials to a distance not exceeding 50 m and depositing where directed a level not exc. 1.5 m from the starting point, complete all as specified and directed. Notes:- (i) The work shall be executed by providing 01(One) Mazdoor (Unskilled category of worker). (ii) Duty hours register of the worker shall be maintained.

Materials and Labour for plain cement concrete (1:3:6) type C1 using 20 mm graded aggregate as in surface channels and drains including demolition of existing cement concrete (un reinforced) of any description and in any position not otherwise specifically provided for,complete all as specified and directed.

Materials and Labour for plain cement concrete (1:2:4) type B0 using 12.5 mm graded aggregate in lintels up to 1.5m clear span, cills, steps; seismic and other similar bands, plinth courses, string courses, lacing courses, parapets and railings up to 60 cm in height, copings, kneelers, apex stones, bed plates, kerbs, water troughs and the like including weathering, slightly rounded or chamfered angles and throating, as directed including necessary from work complete all as specified and directed.

Materials and Labour for brick work with Sub Class ‘B’ bricks straight or curved on plan exceeding 6M mean radius built in cement mortar (1:6),including demolition of existing brickwork or stone/boulder masonry, built in cement mortar or cement lime mortar including all quoins, arches, pillars,etc, but excluding ashlar facings, dressed stonework and precast concrete articles,complete all as specified and directed.

Materials and Labour for rendering 15 mm thick,cement plaster, in cement mortar (1:4) on fair faces of brick work or concrete surface in walls and finishing surface even and smooth without using extra cement,complete all as specified and directed.

M/s Singh Furniture Mart

Singhs Construction

M/S A K MITRA

Shri A. K. Goswami

M/S N G CHOWDHURY

SHRI D. C. BISWAS

M/S R.B. Construction