SPECIAL REPAIR TO 1.50 LAKH GALLON CAPACITY OHT AT ASC TANK CAMP 22/2 UNDER GE CLEMENT TOWN, DEHRADUN

Amount

Repair to RCC over head tank of capacity 1.50 lakh Gallon at the stagging of 15.20m high with the execution of following items as given in item No. 1.10 to 1.90 and bidders are requested to quote their rate against each item accordingly complete all as specified and directed.

Surface Preparation : The internal surface of RCC tank shall be cleaned including removal of all dirt, oil, laitance, fungi by profusions mechanical grinder or manually to obtain a clean and a fairly smooth surface complete all as specified and directed.

Crack Treatment : M&L for Cutting and opening cracks to a depth of 10mmx10mm in V shape by mechanical means. Cleaning all the dirt and loose particles by airpressure and wetting crack to attain SSD condition. Filling the crack using Nitobond SBR of Fosroc / SBR Latex of Sika/Tapecrete RTU of Cico having specific gravity ranging from 1.015 to 1.040 @ 27 deg celsisus mixed in the ratio of 1 (polymer) :3 (Cement) maintaining W/C ratio to 0.35 to achieve thixotropic consistency. Product should be tested in accordance with BS 6319 complete all as specified and as directed.

Injection Grouting : M&L for Providing Chemical injection treatment in the form of pressure grouting to the cold joint by injecting cement slurry (Cement to be used should have min blain value 300 - 500 sqmtr per kg) mixed with grout admixture Damp block 2K of Cebex 100 of Fosroc/Intraplast of Sika/ Crystal Seal of CIco @ 225 gms per 50kg of cement, in the required consistency through the pre fixed PVC nozzles in the 18 mm dia holes, fixing of PVC nozzles with Renderoc Plug and final cutting the projected nozzles and sealing off the PVC nozzles after the injection operation is over with Renderoc plug, non-shrink rapid setting mortar compound, finishing, curing etc. as per manufacturers specification and complete all as specified and as directed.

Coving : M&L for applying Cement Mortar (1:4) admixed with Nitobond AR having 43% solid contents at the junction of slab and vertical offsets. Nitobond AR mixed cement mortar shows 75% improvement in adhesion (slant'shear strength N/mm2 as per BS 6319) having control samples complete all as specified and as directed.

Waterproof coating : M&L for applying two coats of high performance, elastomeric, acrylic polymer modified cementitious coating like Brushbond RFX of Fosroc/ Top seal 109 HY of Sika/ Tapecrete RTU of Coco having a mixed density of 1.6kg/cc manufactured by fosroc chemicals /Dr Fixit/SIKA/CICO aplied by company authorized applicators with minimum recommended coverage is 0.5m2/per kg/2 coats to achieve a DFT of 1mm. waterproof coatings shall confirm to ASTM C-836, ASTM D 45641 & ASTM D4060 complete all as specified and as directed. Brushbond RFX coating shall exhibit the following properties: (a) Abrason resistance ASTM-D4060 : 0.85 (b) Tensile strength as per ASTM D412 is 1N/mm2. (c) Adhesion to concrete is greater than 1N/mm2 and (d) Static crack accommodation ASTM-C836 min 1mm system include supply and application all complete as per the fosroc methodology/ or equivalent as approved by GE.

Food grade coating (internal): M&L for providing, mixing and applying Nitocote EP405 manufactured by Fosroc Chemicals India Pvt Ltd and applied by authorised applicator. Nitocoat EP405 of Fosroc/Sikagard -67 of Sika/ Cicoguard-WS of Cico is 100% (volume of solids) solvent free epoxy resin system designed for potable water retaining structures. Minimum recommended rate of applications is 0.25-0.30 lit/ sqm to achieve a total DFT of 200 microns. Product shall be CFTRI approved and cured film shall comply with the requirements of IS 9833-1981. system includes surface prepration and application as per methodology complete all as specified and as directed.

Protective Coating (External) : M&L for providing and applying Dekground E2000 manufactured by Fosroc Chemicals India Pvt Ltd or equivalent and applied by authorised applicator Total anticarbonation system comprises of a silane siloxane based penetrating primer (Dekguard primer WB) and elastomeric pigemented coating (dekguard E2000). Deckguard E2000 is a single component elastomeric, anticarbonation, liphatic acrylic protective coating, or equivalent as approved by GE Minimum recommended rate of application is 1.5m2/lit (including wastage) to achieve a total DFT of 200-300 microns on external side of OHT fulfilling functional parameters of following:- (a) Static crack spanning capability @200 microns dft @23°C : 2mm as per ASTM C836-76. (b) Solar reflective index (white colour) 105% as per ASTM E1980-11 (c) Adhesion greater than 1.0N/mm² as per BS 1881. (d) CO2 diffusion resistane not less than 240 mm equivalent of air thickness and 60cm equivalent of 30N concrete (Taywood method, at 309 microns dft) System includes surface preprtion and application as per Fosroc methodology or equivalent as approved by GE.

Weather proof acrylic exterior emulsion on external surfaces OH Tank of 1.5 lakh gallon capacity on 15.20m high staging : M&L for complete removal of existing treatment by grinding the surface with mechanical grinder before preparation of surfaces of old painted surface by cleaning, rubbing with gunny bags and washing the entire surface with water mixed with bleaching powder including making the surface smooth and free from dent by application of cement based wall care putty and applying two coats of weather proof acrylic exterior emulsion paint (Ist quality) entire surface of old tank including columns, beams, cross beams, beams above slab, exterior surface of tank. The rate quoted by the contractor included all scaffolding arrangement to carryout the work on exterior surface of 1.5 Lakh Gln OH Tank. The second coat of paint shall be applied after getting the Ist coat approved by GE. The application of paint shall be done with the roller only. The contractor shall arrange all safety belt and all other equipment like helmets etc and shall be fully responsible for the safety of the labours. The contractor is advised to visit the site and work out the requirement before quoting the rates. The rate also includes all necessary scaffolding minor repairs requested and nothing extra shall be cleaned by the contractor.

M&L for rendering 15mm thick in CM (1:4) on concrete surfaces of internal walls of RCC OH tank using WPC @2% by weight of cement , finishing the surface even and smooth without using extra cement complete all as specified and as directed. (Note:- WPC shall be measured and paid separately under respective item as "Supply only".) Note for item No. 1.00, 1.10 to 1.90 :- (a) The cost of scaffolding upto a height of height of 15.20 mtr is deemed to be including in the rate quoted by the contractor. (b) The contractor shall make adequate arrangening for safety for the labourers and rate for which is also deemed to be included. (c) The work shall be got executed by the applicator of approved manufacturers as approved by GE. The complete material required shall be brought by the contractor and deposit with the Engr-in-charge and each stage shall be passed by GE.

Supply only integral waterproofing compound (Powder) complete all as specified and as directed.

M&L for rendering 15mm thick in CM (1:4) on brick or concrete surfaces,finishing the surface even and smooth without using extra cement complete all as specified and directed.

M & L for applying two coats of weather proof exterior emulsion paint (Ist quality) over a coat of primer after preparation of newly plastered/concrete surfaces on wall complete all as specified. Note :- The work shall be got executed by the authorised applicator of manufactures as approved by GE. The complete material required shall be brought by the contractor and deposited with the Engr-in-Charge. Each stage shall be passed by GE.

S & F of mild steel work in hand rail, half round or other stock section or core for fixing of wooden hand rails, bluster, running bars, nosing of steps, wind ties, post and struts for fencing, flat iron fillets and the like including necessary cutting, drilling holes, notching etc. as required conforming to Fe-290 Grade E-165 complete all as specified and directed.

M&L for preparation of new or previously untreated steel surfaces of any description, over 10 cm width or girth, not otherwise described and applying two coats of synthetic enamel paint (ordinary tint) over a coat of red oxide zinc chrome primer complete all as specified and directed.

M&L for preparation of old previously untreated steel surfaces of any description, over 10 cm width or girth, not otherwise described and applying two coats of synthetic enamel paint (ordinary tint) over a coat of red oxide zinc chrome primer complete all as specified and directed.

S&F for 20 mm GI pipe railing bore dia of medium grade galvanised steel tubing with all fittings and fixed complete to wall or laid in floor all as specified complete all as specified and directed.

Surface excavation n.exc 30 cm deep and averaging 15 cm deep and getting out in any type of soil complete all as specified and directed.

M&L 150mm thick hardcore (broken stone or boulders) of guage exc 63mm but n exc 100mm, deposited spread and levelled in layers n exc 15cm thick (consolidated thickness) watered and rolled rammed to a true surface complete all as specified and directed.

M & L for 75 mm thick Cement concrete (1:4:8) type D-2 (using 40mm graded crushed stone aggregate) as in sub base complete all as specified and directed.

S& F coloured precast concrete interlocking paver block any shape and size vibro compaction conforming to IS15658-2006 of 60 mm thickness,M-35 grade with grey cement with pigment including 15mm M sand filling below the interlocking paver blocks and similar locations incl watering and consolidation complete all as specified and directed.

M & L for Cement concrete (1:2:4) type B-1 (using 20mm graded crushed stone aggregate) as in kerbs etc complete all as specified and directed.

M&L for 75mm thick PCC (1:3:6) type C-2 (Using 40mm graded stone aggregate) as in plinth protection/path laid in panels, finish the top surfaces even and smooth complete all as specified and directed.

NOTES :- 1. For the items for which specifications not mentioned any where in the tender, the BIS specifications shall be followed.

Aron Water Proofing and Pest Control