Repair Works to Tagore HOR at NITW

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 complete as per direction of Engineer-In-Charge 50mm average thickness

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

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. 50 mm average thickness in 3 layers.

Dismantling old plaster or skirting raking out joints and cleaning the surface for plaster including disposal of rubbish to the dumping ground within 50 metres lead.

12 mm cement plaster of mix 1:4 (1 cement: 4 fine sand)

Repairs to plaster of thickness 12 mm to 20 mm in patches of area 2.5 sq.meters and under, including cutting the patch in propershape,raking out joints and preparing and plastering the surface of the walls complete, including disposal of rubbish to the dumping ground, all complete as per direction of Engineer-in-Charge With cement mortar 1:4 (1 cement : 4 fine sand)

Removing white or colour wash by scrapping and sand papering and preparing the surface smooth including necessary repairs to scratches etc. complete

Providing and applying white cement based putty of average thickness 1 mm, of approved brand and manufacturer, over the plastered wall surface to prepare the surface even and smooth complete.

Filling of Cracks: Identify cracks on the walls and roofs, then chasing them open in the form of groove (Cutting of the crack shall be done of size 5 mm x 5 mm cutting) and Fill the groove with NITOSEAL PU50, a single component low modulus gun grade elastomeric sealant based on polyurethane technology. The applied sealant shall have movement accommodation factor (MAF) of 50% and Shore A Hardness of 32. The applied material shall have average peel strength of 220N and peak peel strength of 260N. (GST applied as per DSR-23) Note: The above work has to be done with the help of trained and skilled labour.

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 cuttingof nipples after curing etc. complete as per directions of Engineer-in-Charge.(The payment shall be made on the basis of actual weight of approved groute injected. Pressure grouting shall be done with Fosroc Cebex 100, plasticizing expandable cementitious grout admixture complying with BS: 8110 Part 1-1985, Section 8.9.4.6.The material shall be injected using 40 PSI injection grout pump with cement slurry mixed Cebex 100 at 225gms/50Kg bag of cement at required points. (GST applied as per DSR-23) Note: The above work has to be done with the help of trained and skilled labour.