PROVISION OF WATER PROOFING TO THE AFLOAT SUPPORT COMPLEX AT MADHUSUDHAN SHED AT CHENNAI PORT UNDER GE NAVY CHENNAI

Water proofing at terrace over screed Surface Preparation: thorough cleaning work, removal of loose screed, repairing the damaged portions and filling any minor potholes with polymer modified mortar using fosroc renderoc SP40 mixed ratio of 4.25 litres per 25KG bag. All cracks should cut open the V-groove and treated with renderoc SP40 (if any crack available in the slab) coving: providing and laying coving at the junction of slab and vertical offsets with fosroc renderoc SP40 mixed with water ratio of 4.25 litres per 25 kg Waterproofing: providing and applying fosroc nitoproof 650 PU fosroc chemicals two component polyurethane based coating that cures by reaction with atmospheric moisture to form a tough but flexible water proofing membrane over the primed surface using nitoproof WB primer on prepared concrete surface as per manufacture's specification. it is elastomeric, seamless water proof membrane applied in 1.5 kg/sqmt. to achieve DFT of 1.07mm thick having a elongation capacity of over 600 %. termination to be done on wall extending the coating to mini. 300mm ht. above the finished floor level and sealed inside the groove of 20mm wide x 10mm thick flushed with polymer modifed mortar as per vendor recommendation. the material shall comply to - ASTM C 836. elongation (ASTM D 412) : > 600% , specific gravity : 1.5 g/cc, solid content : 98%, adhesion to concrete > 2 MPa, tensile strength > 6 MPa, tear resistance (ASTM D 624) : 30 N/mm, water vapour transmission (ASTM E 96) : 0.4 g/m²/hr. shore A hardness ( ASTM D2240).

Protective coating : providing and applying two coats of aliphatic polyurethane top coat over the waterproofing using dekguard PU at a thickness of 100 microns using roller / spray. The quoted rate shall include all material, surface preparation, tools, scaffoldings, safety equipment, labours, etc complete as per manufacture's specification surface preparation: cleaning the surface, removing the laitance, greese, old CR paints, contaminants, curing compound with wire brush / grit blasting. Cleaning the surface with compressed air. Damaged or loose plaster, separation joints between column and wall. beam and wall, to be replaced & repaired with polymer modified mortar renederoc SP40. cracks needs to be repaired with crack sealer material rendroc CS. provide and apply nitocote wall guard premium an acrylic water based elastomeric decorative coating applied at 110 micron DFT in two coats as per manufacturer specification. Coating shall be UV resistant, breathable when applied at 110 micron DFT. The product shall be single component with specific gravity of 1.3± 0.03 and breathable of 22 gm/ m² / day whe tested as per ASTM E 96. rapid chloride penetration test shall be low while tested as per ASTM C 1202-97. accelerated weathering 1500 hours UV exposure no defects tested as per ASTM D 4587 , tensile strength @ 250 micron:≥ 2.5 N / mm² when tested as per ASTM D 412 -02 , adhesion strength to concrete > 2.0 N / mm² as per ASTM D 4541, crack bridging adility ASTM C 836: passes >0.5 mm width & adhesion stregth: 1.3 N / mm² , ( solar reflectance index = 95, solar direct reflectance > 75%, emissivity 92 for white colour shade), carbondioxide diffusion reisitance equivalent thickness of air > 35 meters at 110 microns DFT and > 50 meters at 150 microns DFT .A primer coat of nitoprime AW shall be applied in the ratio of 2.1 ( nitoprime AW : water ) followed by two coats of nitocote wallguard permium maintaning the drying.