Repairing and Renovation works of Aerator at Plant area of AGBPS NEEPCO Ltd Bokuloni Dibrugarh Assam

Amount

Cleaning of exposed concrete surface of sticking material including loose and foreign material by sand blasting with coarse sand followed by and including cleaning with oil free air blast as per direction of Engineer in charge.

Providing and inserting 12mm dia galvanised steel injection nipple in honey comb area and along crack line including drilling of holes of required diameter (20mm to 30mm) up to depth from 30mm to 80mm at required spacing and making the hole & crack dust free by blowing compressed air, sealing the distance between injection nipple with adhesive chemical of approved make and allow it to cure complete as per direction of EngineerIn-Charge.

Providing grouting in R.C.C Column and slab by drilling holes up to the required depth in a zigzag manner or as per drawing using a drill machine fixing a nozzle 12 mm dia for injecting grout materials till the refusal of injected grout materials from the adjacent nozzle (grouting operation pressure shall be in between 2 to 4kg per Sqm). Followed by cutting the exposed nozzle so as to make the surface of the column and slab area free from grouting pipes and to seal the gap with polymer modified mortar as specified and directed by the department complete at all levels. All required machine and materials to be arranged by the contractor. Polyurethane injection grout in concrete/RCC work of approved make . Materials description:Fosroc Nitofil WS60 PU Foam Grout.

Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-in-charge. Note: Measurement and payment: The premeasurement of thickness shall be done just after the surface preparation is completed and Payment under this item shall be made only after proper wet curing has been done and surface has been satisfactorily evaluated by sounding / tapping with a blunt metal instrument and/or the 75mm size cube crushing strength at the end of 28 days to be not less than 30 N/Sqmm2). 12 mm average thickness

25 mm average thickness in two layers

Providing and applying Deckguard E 2000 ot Masterseal 878 of BASF or equivalent, a High Performance Anticarbonation Protective Coating System, over the prime surface using an airless spray or roller at right angles to each other @ coverage of 5 Sqm per litre per coat @ 200 microns wft / 100 microns DFT with an intercoat period of minimum 12 hrs @ 35ºC. The coverage per litre for 2 coats shall be 2.5 Sqm @ 200 microns DFT. The protective coating system should have CO2 diffusion resistance not less than 240mm equivalent of air thickness and 60cm equivalent of 30N concrete along with a water vapour transmission resistance of less than 1.0 metre (Taywood method), the coating should have static crack accommodation of not less than 2mm (BRE) and adhesion greater than 1.0 N/mm² as per BS 1881.

Bidder Name

Amount in Words

GAUTAM GOGOI

DURNA CHETIA

RAJEN DEHINGIA

New Horizon Enterprise

New Horizon Enterprise

RAJEN DEHINGIA

DURNA CHETIA