Special Repair of Bridges at km 59.100 to km 95.600 of Mangaon Tamhini Ghat section of NH-753F in the state of Maharashtra during 2026-27

Removal of Vegitation/Plants:-Removal of entire root inside the bridge portion. Remains of the root shall be treated with special chemical Steripure MBT 20. Top 50mm shall filled with high strength grout including cost of all material, machinery, labour, scaffolding, etc.as per specification and as directed by Engineer-in-Charge. (Item No. 47.05)

Remove loose, disintegrated and porous concrete at cracks and joints. Repair the same with epoxy or polymer modified mortar. Drill injecting holes to a depth of 2-4 inches in the concrete depending upon width of cracks, extent of damage and dimension of structural elements. Fix the grouting nozzles. Clean all loose dust particles from the cracks and holes by blowing compressed air through all the nozzles in succession. Whenever required grouting nozzle can be introduced for subsequent cementitious lime grout which is based on special limes with thixotropic agents, aldehyde based polymer and selected sands having high abrasion resistance by using Lime based Hydraulic Injection Suspension as approved by Engineer in charge. Before injecting the grout, it is advisable to make sure the nozzles are free of dust. Care is to be taken that the air pressure is monitored and maintained so as not to damage the matrix. Mix cementitious lime based hydraulic ready to use-Hydraulic Injection Suspension with 35-45% water by its weight in clean container using a low speed air driven mixer/stirrer to form a mix of uniform and flowable consistency. Depending on temperature, the water demand may vary. Lime based Hydraulic Injection Suspension should have following properties: 1. Bulk Density: 1.8 0.2 2. Compressive Strength(28 days): W/P(0.45)-Appx. 10 Mpa. It shall be applied as per manufacturer's specification.(If scaffolding is required, same shall be provided and will be paid under relevant item) (Item No. 52.40)

Providing Polymer modified cement Mortar treatment after removing of existing, clading, plaster, gunite & cleaning and preparing the surface.Applying Polymer cement bond coat and Polymer modified cement Mortar as per manufacturer specification up to 50mm thick with 8% polymer by weight of cement to fill the all cavities & making protective cover plaster including shuttering (Item No. 51.153)

Dismantelling existing damaged Drainage Water Spout and providing 100mm diameter GI water spouts as per detailed drawings in RCC slab and wearing surface/kerb etc. complete (Item No. 19.41)

Providing 100mm diameter GI water spouts as per detailed drawings in RCC slab and wearing surface/kerb etc. complete. (Item No. 14.50)

Milling of existing bituminous surface to specified depth of bituminous layer including disposal of removed material with all lift and lead upto 1000m etc complete. Using machine like Writgen(W100) or equivalent (Item No. 51.134)

Providing and laying 12mm thick mastic asphalt wearing course on top of deck slab excluding prime coat with paving grade bitumen meeting the requirements given in table 500-29, prepared by using mastic cooker and laid to required level and slope after cleaning the surface including providing antiskid surface with bitumen precoated fine grained hard stone chipping of 4.75mm nominal size at the rate of 0.005 cum per 10 square metre and at an approximate spacing of 10cm center to center in both directions, pressed into surface when the temperature of surfaces not less than 100 deg C, protruding 1mm to 4mm over mastic surface as per clause 515 etc. complete. (Item No. 14.55a)

Providing and applying tack coat on the prepared surface heating by fames in Boiler and spraying bitumen set footed in bitumen boller on B.T. surface 2.5kg/10sqm.(VG-30 bulk bitumen rates are considered to arrive at rates) (Item No. 3.30)

BITUMINOUS CONCRETE:-Providing and laying bituminous concrete using crushed aggregates of grading 1, premixed with bituminous binder @ 5.20 per cent by weight of total mix and filler, transported to site with VTS, laid over a previously prepared surface, finished to the required grade, level, alignment, and rolling to achieve the desired compaction for 50mm compacted thickness with specified grade of Bitumen, Excluding prime/tack coat. For Bitumen of specified grade -- USING Batch mix type hot mix plant with SCADA, Sensor Paver, Vibratory roller with Stone Dust filler.(VG-30 bulk bitumen rates are considered to arrive at rates) (Item No. 3.48)

Providing and Laying hot applied thermoplastic road marking strip on Bituminous Surface of specified shade/colour of 2.5mm thick including 1.5 Refractive index reflectorizing glass beads @ 250gm/sqm .Thickness of 2.5mm is exclusive of surface applied glass beads as per IRC 35:2015. Initial Dry reflectivity RL shall be > 250 mcd/sqm/lux measured in the initial 7 days and sustained reflectivity RL of 100 mcd/sqm/lux and Qd of 100 mcd/sqm/lux measured at the end of 2 years by means of a Standard Reflectometer of Zehntner, Easylux, Delta make capable of measuring RL & QD both according to IRC 35:2015 clause 15.5. The finished surface to be level, uniform, and free from streaks and holes complete as per direction of Engineer-in-charge and in accordance with applicable specifications.(Refer MORTH Clause 803 for technical Specification and Performance for IRC 35:2015). (Item No. 6.12a)