Public Works Department Tender

[28.16]Providing and laying water proofing treatment on roofs of slabs by applying cement slurry mixed with water proofing cement compound consisting of applying: (a) after surface preparation, first layer of slurry of cement @ 0.488 kg/sqm mixed with water proofing cement compound @ 0.253 kg/sqm (b) laying second layer of Fibre glass cloth when the first layer is still green. Overlaps of joints of fibre cloth should not be less than 10 cm. (c) third layer of 1.5 mm thickness consisting of slurry of cement @ 1.289 kg/sqm mixed with water proofing cement compound @ 0.670 kg/sqm and coarse sand @ 1.289 kg/sqm This will be allowed to air cure for 4 hours followed by water curing for 48 hours. The entire treatment will be taken up to 30 cm on parapet wall and tucked into groove in parapet all around. (d) fourth and final layer of brick tiling with cement mortar (which will be paid for separately). For the purpose of measurement the entire treated surface will be measured. [Through Rate]

[28.6]`Providing and applying waterproofing treatment to sound, moisture free concrete surface using liquid applied single component pitch free polyurethane coating capable of bridging substrate cracks up to 2 mm. It shall be applied in two coats at coverage rate of 2kg/sqm to a achieve a minimum DFT of 1.3 mm. The membrane formed shall confirm to following minimum properties: 1) Elongation : )400% as per ASTM D 412 2) Tensile Strength : 2.5 N/mm2 as per ASTM D 412 3) Adhesion in-peel test : )50 N as per ASTM C- 836 4) Recovery from 350% elongation : 95% as per ASTM D 412 5) Water Vapour Transmission 2.3mm film: 0.6 g/m2/hr 6) Initial Hardness Shore A : min 60 as per ASTM D 2240 7) Root resistant : protection screed required System includes supply , application and termination of coating all complete as per the manufacturer`s methodology. Clean the RCC slab/screed surface and wall for treatment by removing dust, dirt and layers of concrete over the surface. etc. by mechanical tools and wire brushing. Pressure grouting at construction joints or honeycombs with non shrink cementations grout by mixing shrinkage compensating admixture per bag of cement as per manufacturer`s recommendations. Prepare a side gola of 50X50 mm at the junction using polymer modified mortar. Providing and applying liquid applied single component pitch free polyurethane coating in 2 coats at coverage rate of 2kg/sqm to a achieve a minimum DFT of 1.3 mm. (Fibre cloth/fleece/reinforcement should not be used in between two coats of PU as it has adverse effect on elongation property and also affects bonding with slab). Termination shall be done 300 mm above FFl by providing a groove cut of 30mm x 30mm and seal it with shrinkage compensated polymer modified mortar. Lay a 150 GSM geotextile layer to protect the coating from external damage on final coating before laying of screed concrete/final finish. It shall be applied as per manufactures specification. Rates are incl of surface preparation, grouting and chemical application only. (Rates for geotextile, protection plaster and final finishes such as screed or Brick bat filling for slope, china mosaic, tiles etc is not included in above item. It will be added as per EIC requirements).` [Through Rate]

[30.9]Regarding terracing of mud phaska covered with tiles or brick, in cement mortar by dismantling tiles or bricks, removing mud plaster, preparing the surface of mud phaska to proper slope, relaying mud plaster gobri leaping and tiles or bricks, grouted in cement mortar 1:3 (1 cement : 3 fine sand), including replacing unserviceable tiles or bricks with new ones and disposal of unserviceable material to the dumping ground (the cost of the new tiles or brick excluded), all complete as per direction of Engineer-in-Charge. [Through Rate]