Bhabha Atomic Research Centre Tender

Providing structural repairs in old damaged concrete structures / surfaces with approved Polymer with following operations 1) Removal of loose/Spalled or damaged concrete by chipping and cleaning the concrete surface and reinforcement steel with wire brush and with water 2) Cleaning the re bars with Acetone for complete rust removal and washing with water to make the surface clean. 3) Applying protective coat / bond coat using polymer and cement in the proportion of 1; 1.5 (1 part of polymer and 1.5 parts of cement in synthetic enamal paint like consistancy with brush 4) Reinstate the area with polymer modified mortar in layers of maximum 20 mm with the proportion of Cement 50 Kg : washed and dried river sand 87.50 kg ; silica sand 37.50 Kg. mixed with 10 litres of Polymer (or 1 Kg cement : 1.75 kg washed and dried river sand ; 0.75 Kg silica sand : 200 ml polymer) 5) If thickness of repair exceeds 20mm , after every 20 mm thick repair, bond coat as per 2 above to be applied and further thick of repair to be continued for each layer. This work is inclusive of all materials, labour, complete all as directed at site using approved polymer suitable for structural repair shall be used) Note: Scaffolding will be paid separately under relevant item.

Providing SFMC Micro concrete for strengthening of structural members including mixing, pouring, curing as per manufacturer specifications and as directed by the Engineer-in-charge. Using 100% SFMC.

Providing and applying cold liquid Polyurethane waterproofing system having following layers: (a) Primer / base coat: Providing and applying (Pre-Measured Packed) silver grey coloured 2 (two) component solvent free, odourless, Epoxy-based Primer with excellent adhesive property on the clean and grinded surface/substrate. The substrate can be slightly moist (in concrete, the moisture must be less than 20 %), sound and free from any material that would hinder good adhesion. Mix component 'A' into component 'B' in ratio of 1: 0.16 by weight thoroughly with a clean stirring stick. The mixture should be of uniform colour & free from streaks and be applied evenly with roller. The primer should be completely dry for further application of liquid applied polyurethane based membrane/ coating. The consumption, depending on the nature and condition of the substrate for priming, should be within the range of 250 – 400 gm/sq.m. The rate shall including cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. (b) Top coat: Providing and applying cold liquid applied waterproofing based on highly flexible solvent free single component Polyurethane system and special needle punched non woven, system compatible polyester fleece of minimum 120 GSM as reinforcement. The cold liquid applied reinforced system shall have high crack bridging property and shall be UV stable, solvent-free, Cool Roof system. Application procedure: (i) Stir the material well before use. (ii) 2/3rd of the waterproofing mix material to be applied on the primed substrate and the special polyester fleece of min. 120 gsm to be rolled with roller including removal of air bubbles with an overlap of min. 5 cm. (iii) The remaining 1/3rd of the waterproofing material to be poured onto the surface until complete saturation is achieved. The layers should be applied on wet surface of earlier coat and there should not be any time lag during the laying of the system. (iv) After curing, one coat of material approx. 300g/sq.m. to be applied after 24 hours. (v) The total system of waterproofing for material and components shall be procured from single manufacturer. (vi) The total thickness achieved from the application should be from 1.4 to 1.7 mm. (vii) The total consumption of mix waterproofing depending on the nature, porosity and condition of the substrate should be in the range of 2.3 to 2.7 kg/sq.m. The rate shall including cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. Specifications/Technical Parameters: The tensile strength of the membrane shall be min. 8.60 N/sq.mm and Elongation at break with fleece shall be min. 83.0 % (with fleece). The Tear Resistance of the membrane shall be min. 41.0 N/mm, Solar Reflection Index (SRI) Value of membrane shall be min. 100, Degree of solar reflectance of the membrane shall be min. 85% and adhesive strength shall be min. 2.40 N/sq.mm. etc. Note : The contractor shall provide min. 10 (ten) years Leak Proof Performance warranty for the complete waterproofing work. Tentative / suggested make for the guidance of bidder(s): Kemperol 1K system of M/s Kemper System Pvt. Ltd. or equivalent .

Supply and Application of flexible Thermoplastic Polyolefin (TPO) Membrane having minimum thickenss of 1.5 mm with Reinfored Fabric (RF) / scrim; which shall be free from plasticizer, chlorine & pthalate and should meet the specifications as per ASTM D6878 and is manufactured using a hot-melt extrusion process for complete scrim (reinforcing fabric) encapsulation. The TPO membrane shall be reinforced with a strong, polyester reinforced fabric (scrim) at the center and a tough thermoplastic polyolefin compounded top ply and the bottom ply of total thickness of 1.5mm. The TPO Membrane shall have white colour top with a very high resistance to weathering agents and UV rays. The TPO membrane shall have the following minimum/maximum properties as per ASTM D6878: (i) Breaking Strength min. 220lbf (976N) (testing as per ASTM D751) (ii) Elongation at reinforcement break: min. 15 % (testing as per ASTM D751) (iii) Tearing Strength: min. 55lbf (245N) (testing as per ASTM D751) (iv) Factory seam strength: min. 66lbf (290N) (testing as per ASTM D751), (v) Brittleness Point of minimum -40 deg (testing as per ASTM D2137) (vi) Thickness of coating over the fabric or scrim, min. 0.48mm (weathering side only) (vii) Ozone resistance: No crack (testing as per ASTM D1149), (viii) Properties after heat aging (testing as per ASTM D573) (ix) Water absorption: max. 3% by mass (testing as per ASTM D471) and (x) Weather resistance (testing as per ASTM G155). The rate shall include cost of 300 gsm geotextile mambrane as cushioning / separation layer between existing bituminous waterproofing layer and the TPO membrane, termination bars with PU/Hybrid sealant, high performance glue with good adhesion property and suitable concrete fasteners (coated steel, 3 inch. round, 1-1.5 inch buttress head) and plate washers (26 gauge plate) with PU/ Hybrid Sealant and Aluminium strip (2mmm thick, 25mm wide & 3m long) end terminations. The joints shall be thermo welded with machine welding. The fasteners / screws shall be covered under the overlaps.The whole treated terrace / area shall be flooded with water for a minimum period of 24 hours to test against leakage/seepage.Tentative / suggested make for the guidance of bidder(s): M/s Pidilite / M/s. FOSROC India Pvt. Ltd. or equivalent. Note: (1) The above work shall include all consumables, adhesives, accessories as approved by approved Manufacturer which are required to complete the work in all respects. (2) The work has to be carried over existing tarfelt waterproofing and appropriate remedial measures as per manufacturers specification shall be taken wherever total debonding of the tarfelt roofing has occurred, repair to substrates wherever required at no additional cost to the Department. (3) The work shall include the cost for all lead and lifts and for working at any location. (4) Wherever TPO membrane is fixed at visible edges/fascia of the elevation of the building, the same shall be executed to proper line and level without any undulations upto the satisfaction of the Engineer-in Charge. (5) Contractor shall submit Manufacturers test certifcate and shall also bear the cost of third party tests for all physcial and chemical parameters from BARC approved Lab if required by the Engineer-in Charge. (6) Contractor shall follow Method Statement attached alongwith the tender and as per satisfaction of Engineer-in Charge for execution of work. (7) Contractor shall submit a waterproofing Guarantee of 10 years.

Providing and installing waterproofing system for terrace joints on pre-existing FRP (Fibre Reinforced Polymer) with TPO,APP etc. membrane waterproofing using 02-component, pigmented waterproofing resin with polymethyl methacrylate (PMMA) base reinforced with special fleece to provide watertight joints which becomes rainproof after 30 mins of application, having certifications like ETAG 005 for durabiity, CE Certification, Root resistance as per FLL std, Fire proof as per EN 13501 etc. Surface preparation includes cleaning of sound concrete surface to remove loose dust,dirt etc., mix and apply suitable primer as per substrate using suitable brush/roller at below mentioned coverage, allow the primer to cure for min 45 mins, prepare coating by adding activator Catalyst @ 20 gm/Kg and mix using slow speed drill for min 2-3 mins, apply first coat by using suitable brush/roller coverage @ 1.5 kg/m2, fixing of Perforated Polyester Fleece of 110-120 GSM while coating is still wet, allow the first coat to cure for 45 min, followed by application of final coat of coverage @ 1.5 kg/m2. The system exhibits properites like Shore A Hardenss- 75, Tear resistance-150 N/mm,Elongation- 30 %, water vapour diffusion resistance-10000 m. Primer Consumption as per Surface : 1. Cryl primer 222 – Recommended for concrete, APP,SBS Membrane, wood and other porous substrates. at coverage 0.35-0.45 kg/m2. Treatment of Junction between FRP surface and TPO Membrane - Width of application : 100 mm. Tentative / suggested make for the guidance of bidder(s): M/s. Dr. Fixit or equivalent.

Providing & filling the gaps with single component Polyurethane based expanding foams cylinder(750 ml), with High foam yield – up to 45 litres (750ml, freely foamed) containing no CFC’s. Approximat density of Pu-foam is of 17 kg/cum and used with a finger dispenser and shall be used for the filling of breaches/penetrations in walls, penetrations for pipes, cladding, form joints, shafts, backfilling of sealants, pre-cast components, holes left by concrete

Providing and Painting with Epoxy PU paint using 2 coats of (120 Micron dry film thickness) Epoxy PU high build coating as finishing coat over a priming coat of High Build primer of 50 micron thickness over steel surfaces at all locations prepared and applied as per manufacturer' specifications including preparation of surface by cleaning with wire brush and rubbing, scraping , applying sand paper , making free of Rust, dust, dirt etc. filling the holes, joint, cracks if any using epoxy putty complete. all as per manufacturers technical data and as directed at site to achieve minimum overall dry Film thickness of 170 micron (50 Micron primer Coat + 120 micron finishing Coat). On STEEL surfaces.

Providing and painting old walls TWO coats on existing cement paint surface applied with fine textured exterior paint of approved make, required shade, including preparation of the surfaces, scaffolding complete. as per specifications and as directed by the Engineer-in-charge. (In plain plastered / sand face plastered / concrete surfaces)

Providing 20 mm thick plastering using Ready mix external plastering compound of approved make for external faces of brickwork / concrete surfaces including preparation of the surface, curing, cleaning scaffolding up to 10 metres height complete.all as per specifications including forming drip moulds wherever necessary and as directed by the Engineer-in-charge

Pressure Grouting with cement slurry from inside of slab and wall of structure including fixing nipple nacessary pump for grout all material, labour etc. complete as directed by the engineer-in-charge.

Providing and fixing double tubular scaffolding system using H- frames with cup lock type on the exterior side upto seven story height made with 40 mm dia M.S. tube 1.5 m centre to centre horizontal and vertical tubes joining with cup and lock system with M.S. tubes, M.S. tube challies, M.S clamps and M.S staircase system in the scaffolding for working platform etc. and maintaining it in a serviceable condition for the required duration as approved and removing it thereafter. The scaffolding system shall be stiffened with bracings, runners, connection with building etc. wherever required for inspection of work at required locations with essential safety features for the workmen etc. complete as per directions and as approved by the Engineer -in - charge. The elevational area of the scaffolding shall be measured for payment purposes. The payment shall be made once irrespective of duration of scaffolding

Supplying of manpower along with necessary pans, spades, shovels pickaxe, punjas, ropes, small special spades, raincoats, safety shoes etc. for any number of labours as and when decided by Project Engineer to work for eight hours per day or monsoon period to carry out the cleaning of chocked drains grating grillsl hume pipes/ footpath by removing the dry leaves, silt etc. and also carry seasonable departmental work allotted by Project Engineer from time to time. IMPORTANT NOTE: Police Verification Certificate issued by Special Branch of Police is required for Contractor, Engineers, Supervisiors and all the labours to work inside BARC and the same shall be arranged by the Contractor.

Cleaning the horizontal and vertical surface, chasing opening the construction joints, cracks, honeycombing area, etc and grout with low viscosity epoxy material (with hardener & resin) as per manufacturer specification, curing etc. complete and as directed by Engineer In Charge. Tentative / suggested make for the guidance of bidder(s): M/s Pidilite / M/s. FOSROC India Pvt. Ltd. /BASF or equivalent.

Providing and constructing brick work in cement mortar using Standard bricks of approved quality / class, make / brand in super structure above plinth up to Floor-II level in all shapes and sizes including curing, raking out joints complete as per specifications and as directed by the Engineer-in-charge.Brickwork in super structure with standard bricks in C.M 1:4 using crushed Sand

Extra for Brick work in super structure above floor II level and up to and including 20 m height by lifting mater.