Provision of Impervious stratum treatment and miscellaneous civil works in FIPLY and other sea side buildings at North site, BARC, Trombay.

Dismantling old plaster / skirting carefully, raking out joints and cleaning the surface for plaster including disposal of rubbish to the dumping ground within 100 m lead

Providing 20 mm thick plastering using Ready mix external plastering compound of approved make or approved equivalent meeting all the technical specifications as per relevant codes and standards for external faces of brickwork / concrete surfaces including preparation of the surface, hacking, 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

Removing bitumen based / Chemical based waterproofing with synthetic wire mesh treatment from terrace chajjas, parapets etc, and disposal within 50m . Note : All surfaces shall be made free from gross irregularities, loose, unsound or foreign material such as dirt,water, grease, oil, release agents, lacquers, or any other condition that would be detrimental to adhesion of the primer and membrane. This requires careful preparation of existing horizontal and vertical substrates; cracks are filled, expansion joints,flashings(if any) are prepared. Substrates and penetrations shall be prepared to rigorous industry standards, and may require scarifying, sandblasting or grinding in some cases to achieve a suitable substrate and the cost of the above work shall be deemed to be included in the quoted rate.

Providing and injecting approved non shrink cementitious grout in proportion recommended by the manufacturer into cracks/holes/gaps/honey comb area of concrete/masonry by suitable gun/pump as required pressure including providing and cutting of nipples after curing etc complete as per direction of Engineer In Charge. Note : Grouting in cement based waterproofing slab.

Providing and applying cold liquid Polyurethane waterproofing system on Horizontal surfaces including coving (if any) 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.

Providing and applying cold liquid Polyurethane waterproofing system on Vertical surfaces above coving (if any) 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. 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) 50% of the waterproofing mix material to be applied on the primed substrate with roller including removal of air bubbles with an overlap of min. 5 cm and until complete saturation is achieved. (iii) After curing, balance 50% of material to be applied after 24 hours. (iv) The total system of waterproofing for material and components shall be procured from single manufacturer.  (v) The total thickness achieved from the application should be from 0.47 to 0.57 mm. (vi) The total consumption of mix waterproofing depending on the nature, porosity and condition of the substrate should be in the range of 0.77 to 0.80 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.

Providing supplying and sealing 50mm wide Expansion Joints with Gungrade Polysulphide sealant suitable for RCC Construction Joints of approved equivalent meeting all the technical specifications as per relevant codes and standards by removing the expansion joint board up to 25 mm deep and cleaning thesuface neatly and filling Gungrade sealent up to 25 mm deep to the lines and levels complete all as per manufacturer's specifications and a sdirected by the Engineer-In-Charge.

Providing and fixing to the inlet mouth of rain water pipe cast iron grating 15 cm diameter and weighing not less than 440 grams

Providing and applying cementitious based crystallinewaterproofing system : (i) Cleaning the Surface with wirebrush, high pressure water jet to remove dust, dirt etc. (ii) All Honeycombs/ loose concrete shall be treated using low-shrink cement mortar. The construction joints shall be chased open andfilled with high strength polymer mortar and to be grouted withcement slurry by fixing PVC nozzles at distance of 2m c/c. (iii) Applying cementitious based crystalline slurry in two coats onRaft, Retaining wall or RCC structural member from Inside (negative side) and on terrace slabs from outside in order toform insoluble gel crystals that penetrate deep into the concrete to permanently block the capillaries and minor cracks up to0.3mm width. The Crystalline cementitious waterproofing treatment shall remain water- resistant even under pressurewhen tested in accordance to DIN 1048 and at the same timeallow the concrete to “breathe” by allowing the passage of water vapour out of the structure.

Providing & applying structural repairs with pre-packed dual shrinkage controlled (volume stable in wet & hardened state), single-component ready-to-use, structural grade high build, alkali-resistant, fibre-reinforced, thixotropic polymer modified repair mortar having excellent bond strength to old damaged concrete structures / surfaces in the following process: 1) Removal of loose/spalled or damaged concrete by chipping and cleaning the concrete surface to open up to 20mm behind the reinforcement steel with wire brush and with clean water 2) Cleaning the rebars with Acetone for complete rust removal and washing with water to make the surface clean. 3) Applying protective coat / bond coat using Styrene Butadiene Rubber (SBR) polymer and cement in the proportion of 1: 1 (1 part of polymer : 1 parts of cement). 4) Mixing full 25 Kg bag with clean potable water in water to product ratio of 0.12 to 0.18), mixed by heavy-duty slow speed (300 to 600 rpm) drill with spiral mixing paddle or forced action pan mixer pan for 3 minutes to achieve uniform lump free mortar consistency. 5) Applying polymer modified mortar with trowel & float. The polymer modified mortar shall have the following properties/technical parameters: (A) Properties / technical parameters of pre-packed Polymer Modified Mortar: i) Compressive strength 1 day: Min. 20 MPa (as per BS:6319 : Part 2)ii) Compressive strength 7 days: Min. 35 MPa (as per BS:6319 : Part 2) iii) Compressive strength 28 days: Min. 45 MPa (as per BS:6319 : Part 2) v) Tensile strength in 28 days: Min. 2.5 MPa (as per BS:6319 : Part 7) iv) Flexural strength in 28 days: Min. 7 Mpa (as per BS:6319 : Part 3) vi) Bond strength: Min. 5 MPa (as per ASTM : C881) vii) Water permeability: less than 1% (as per ASTM : C881) viii) Drying shrinkage in 28 days: less than 1000 microstrain (as per ASTM C 157-93) ix) Potential Alkali Reactivity - : <0.1% Expansion % ( ASTM C1260) (B) Properties / technical parameters of SBR polymer bond coat material: i) Meets the requirements of BS 6319 part 2:1983 & ASTM C 190-85 standards ii) Total solids % by mass at 105oC: 38 + 1 iii) pH value: 7.5 to 9.5 iv) Specific gravity at 27.5oC: 1 to 1.05 v) Coverage: 4.2 - 4.5 sq.m/kg per coat Notes:- (a) If ambient temperature is more than 30oC, use chilled water for mixing and store unused product in shed. Placing and finishing the same with trowel carefully compacting the same around the rebars and finishing to bring it in line with existing concrete surface on the beams, slabs, columns, etc. (b) If thickness of repair exceeds 20mm , after every 20 mm thick repair, bond coat as per process no. (3) mentioned above in the BOQ item, to be applied and further thickness of repair to be continued for each layer. (c) The surface preparation & method of application shall be as per manufacturer's technical data sheet. (d) The double tubular steel scaffolding will be paid separately in relevant item. (e) Safety Precuations:- Use wear tight-fitting, dust-resistant, chemical splash goggles and dust respirator, if airborne dust is generated, wear protective rubber hand gloves, wear appropriate clothing to prevent any possibility of skin contact. The above item of work is inclusive of all materials, SBR polymer, labour, machinery, tools & tackels, consumables, trasportation, loading & unloading, safety PPEs etc. all complete as directed by Engineer-in-charge at site using approved pre-packed polymer modified mortar suitable for structural repair works. Repair for waterprooing work i.e for item 5 & 6 will not paid under this item. This is for fresh repair work.