REPAIR MAINTENANCE OF FLEXIBLE PORTION OF PAVEMENTS TAXI TRACK AND PTT WITH PMB AND REPAIR/MAINTENANCE OF CRACKS IN FLEXIBLE PORTION RIGID PORTION DISPERSAL OF PAVEMENTS IN TECHNICAL AREA AT AIR FORCE STATION TEZPUR UNDER GE AF TEZPUR

Amount

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 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 and cleaning the surface,complete all as specified and as directed.

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 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 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 instructions 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.

Repair to cracks(1mm-3mm wide) in existing rigid/flexible pavement of dispersal/ runway/ PTT by cleaning the cracks with hand brushes or water under pressure and drying with compressed air etc. filling in the cracks with epoxy mixture of araldite and hardener,araldite 02 (Two) parts and hardener 01 (one) parts,complete all as specified and as directed.

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.

M/S Kangkans

M/S Shankar Boro

LUIT CONSTRUCTION

SHRI D. C. BISWAS

M/S A K MITRA

M/S Mandeep Singh

Shri A. K. Goswami