Waterproofing work of eastern entry building at Ernakulam south railway station

Amount

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.

Disposal of building rubbish/ malba/ similar unserviceable, dismantled or waste materials by mechanical means, including loading, transporting, unloading to approved municipal dumping ground or as approved by Engineer-in-charge, beyond 50 m initial lead, for all leads including all lifts involved

Polyurethene injection work Clean off all surface coating and stain around the leakage area. Study and determine leak pattern and establish leakage source. Drill injection ports at distance of 200mm centre-to centre to intercept the leak paths. The injection ports shall be drilled at a depth required. Check for positive interception of injection ports onto leak path by observing for leakage diversion through injection ports. If leak is not detected in the injection ports, change location or angle and re-drill. Once positive interception is confirmed, clean injection ports with water and install mechanical injection packers.Injection packers shall have check valve, which prevents back flush of grout and capable of holding pressure of up to 1050 psi (7 N/mm2). Pump water through injection packers to flush out leak paths as well as saturate it with water (if necessary).Seal off honey comb area or larger cracks, which leak severely when pumped with water, with hydraulic cement (if necessary).Pump the water-reactive polyurethane grout through injection packers to a prescribed pressure. The mixing of the material must be strictly according to the supplier's recommendation. As the grouts expand during the reaction with water, it is necessary to return to previously grouted points to check that the prescribed backpressure is maintained before grout is fully cured. Remove injection packer after the grout has fully cured. (Rate of injection packers paid extra as per actual requirement)

Providing and fixing mechanical injection packers having check valve,which prevents back flush of grout and capable of holding pressure upto 7 N/mm2 fpr injecting the polyurethane grout

Providing and applying integral crystalline slurry of hydrophilic in nature forwaterproofing treatment to the RCC structures like retaining walls of the basement,water tanks, roof slabs, podiums, reservior, sewage & water treatment plant, tunnels/ subway and bridge deck etc., prepared by mixing in the ratio of 5 : 2 (5 partsintegral crystalline slurry : 2 parts water) for vertical surfaces and 3 : 1 (3 partsintegral crystalline slurry : 1 part water) for horizontal surfaces and applying thesame from negative (internal) side with the help of synthetic fiber brush. The materialshall meet the requirements as specified in ACI-212-3R-2010 i.e by reducingpermeability of concrete by more than 90% compared with control concrete as perDIN 1048 and resistant to 16 bar hydrostatic pressure on negative side. The crystallineslurry shall be capable of self-healing of cracks up to a width of 0.50mm. The workshall be carried out all complete as per specification and the direction of the engineerin-charge. The product performance shall carry guarantee for 10 years against anyleakage.For vertical surface two coats @0.70 kg per sqm

Providing and applying integral crystalline slurry of hydrophilic in nature forwaterproofing treatment to the RCC structures like retaining walls of the basement,water tanks, roof slabs, podiums, reservior, sewage & water treatment plant, tunnels/ subway and bridge deck etc., prepared by mixing in the ratio of 5 : 2 (5 partsintegral crystalline slurry : 2 parts water) for vertical surfaces and 3 : 1 (3 partsintegral crystalline slurry : 1 part water) for horizontal surfaces and applying thesame from negative (internal) side with the help of synthetic fiber brush. The materialshall meet the requirements as specified in ACI-212-3R-2010 i.e by reducingpermeability of concrete by more than 90% compared with control concrete as perDIN 1048 and resistant to 16 bar hydrostatic pressure on negative side. The crystallineslurry shall be capable of self-healing of cracks up to a width of 0.50mm. The workshall be carried out all complete as per specification and the direction of the engineerin-charge. The product performance shall carry guarantee for 10 years against anyleakage.For horizontal surface one coat @1.10 kg per sqm

Providing and applying fibre reinforced elastomeric liquid water proofing membranewith resilient acrylic polymers having Sun Reflectivity Index (SRI) of 105 on top ofconcrete roof in three coats @10.76 litre/ 10 sqm. One coat of self-priming ofelastomeric waterproofing liquid (dilution with water in the ratio of 3:1) and twocoats of undiluted elastomeric waterproofing liquid (dry film thickness of completeapplication/system not less than 500 microns). The operation shall be carried outafter scrapping and properly cleaning the surface to remove loose particles withwire brushes, complete in all respect as per the direction of Engineer-in-Charge.

6 mm cement plaster of mix:1:3 ( 1 cement : 3 fine sand)

Providing and laying M20 grade screed concrete on roof slab 10 mm aggregate admixed with water proofing material at a dosage of 300 ml per bag of cement shall be provided on the floor

R. Sajikumar