Repairing / Retrofitting work for RCC base floor and wall of basement of Special and Multifunctional Structures lab SMSL building at CSIR-SERC Taramani Chennai 600113

Amount

Chipping of unsound / weak concrete material from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges, making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts all within CSIR-SERC campus etc., complete all as per direction of Engineer-In-Charge. 75mm average thickness

Cleaning of reinforcement from rust from the reinforcing bars to give it a total rust free steel surface by using alkaline chemical rust remover of approved make with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washing with water and allowing it to dry etc., complete all as per direction of Engineer-In-Charge. Bars above 12 mm diameter

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Engineer-In-charge complete in all respect. SBR Polymer (@10% of cement weight) modified cementitious bond coat @2.2 kg cement per sqm of surface area mixed with specified proportion of approved polymer.

Applying priming coat:

With ready mixed red oxide zinc chromate primer of approved brand and manufacture on steel galvanised iron/ steel works etc., complete all as per instruction of Engineer-in-charge.

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level etc., complete all as per instruction of Engineer-in-charge.

Thermo-Mechanically Treated bars of grade Fe-500D or more.

Centering and shuttering including strutting, propping etc. and removal of form for etc., complete all as per instruction of Engineer-in-charge.

Walls (any thickness) including attached pilasters, butteresses, plinth and string courses etc.

Providing and laying in position ready mixed or site batched design mix cement concrete for reinforced cement concrete work; using coarse aggregate and fine aggregate derived from natural sources, Portland Pozzolana / Ordinary Portland /Portland Slag cement, admixtures in recommended proportions as per IS: 9103 to accelerate / retard setting of concrete, to improve durability and workability without impairing strength; including pumping of concrete to site of laying, curing, carriage for all leads; but excluding the cost of centering, shuttering, finishing and reinforcement as per direction of the engineer-in-charge; for the following grades of concrete. Note: Extra cement up to 10% of the minimum specified cement content in design mix shall be payable separately. In case the cement content in design mix is more than 110% of the specified minimum cement content, the contractor shall have discretion to either re-design the mix or bear the cost of extra cement. etc all as per instruction of Engineer-in-charge.

All works upto plinth level

Concrete of M30 grade with minimum cement content of 350 kg /cum (Low shrinkage or Shrinkage-Compensating Concrete)

Drilling suitable holes in reinforced or plain cement concrete with power driven drill machine to a minimum depth of 100mm upto 200mm in RCC beams, lintels, columns and slabs to introduce steel bars for sunshades/balconies including fixing the steel bars in position using epoxy resin anchor grout of approved make but excluding the cost of reinforcement etc, complete all as per direction of Engineer-In-Charge. Upto and including 12mm dia rod.

Providing and inserting 12mm dia galvanised steel injection nipple in honey comb area and along crack line including drilling of holes of required diametre (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 etc., complete all as per direction of Engineer-In-Charge.

Providing and injecting approved grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete / masonry by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete all as per directions of Engineer-in-Charge. (The payment shall be made on the basis of actual weight of approved grout injected.) Epoxy injection grout in concrete / RCC work of approved make

Jaisakthi Constructions (BID ID -817114)

M/S. NAVEEN CONSTRUCTIONS (BID ID -817502)

JPS Constructions (BID ID -817490)