SPECIAL REPAIRS RENOVATION AND RETROFITTING TO DEFECTED RCC COLUMNS BEAM SLAB CERTAIN B/R ALLIED WORK IN PRIMARY SCHOOL, HIGHER SECONDARY SCHOOL AND BOUNDARY WALL OF SCHOOL BUILDING AT KENDRIYA VIDYALAYA NO 02 AT ISHAPORE UNDER GE NORTH KOLKATA

Amount

Removal of damaged concrete along with loose damaged and cracked concrete / cover concrete at all specified locations up to beyond the corroded steel reinforcement to a depth of 10mm minimum behind the reinforcement by chipping / hacking with chisel and hammer or by mechanical means like chisel hammer, pneumatic chipper including high pressure water jetting to chipped concrete and reinforcement and removal and disposal of debris within owners premises including all plant and machinaries. hard concrete shall not be removed. However if the rebar is corroded, concrete around it shall be removed. Depth of chipping may vary from 50mm to 150mm complete with labour, machinery tools etc all directed by Engr-in -Charg. The edges of repair locations shall be saw cut to a depth of at least 10mm to avoid feather edging and provide a square edge. removal of dust, loose particles., marine growth etc. from concrete surface manually by wire brush, mechanically or any other means to obtain a sound surface over areas other than above.

Cleaning as directed & specified all rust/scales/corrosion from reinforcement bars using rust remover agent like Reebaklens RR of Fosroc or equiv having specified Gravity 1.16-1.22. The material to be applied to the rusted metal using brush and make leaving to dry for 30 mins & washing surface with fresh water as required to exposed re-inforcement bars complete as specifed.

Providing & applying inhibition coats/system to exposed reinforcement bars after drying & also new bars after cleaning & removing scales and rust completely as specified. Two components inhibitor Nitozinc Primer or equivalent having specific gravity of 1.75, Adhesive bond strength > 1.5N/mm2, solid content 60% 40 microns DFT as approved by engineer shall be used as per manufacturers specification in two coats including all labours, tools and tackles, necessary surface preparation and necessary protection after and during work.

Providing and applying bond coat on the prepared surface to receive polymer modified mortar/ polymer modified micro concrete with two component epoxy based bonding coat Nitobond EP standard of Fosroc Make or equivalent, having specific gravity 1.15 to 1.2 gm/cc, compressive strength (BS 6319 pt II) - 50 Mpa at 7 days, flexural strength( BS 6319 Pt III)- 35 Mpa at 7 days, tensile strength (BS 6319 PT VII)- 20 Mpa at 7 days, Shear Strength BS 6319 (Pt IV)-10 Mpa at 7 Days, having an overlay time of 6 hours and 300 C, laying of reinstatement Polymer modified mortar or micro concrete shall be completed within the overlay time of bonding coat. The bond coat act as s bonding coat between old and new concrete. Item Rate is inclusive of material and labour, tools and tackles scaffolding and transportation etc. complete as per specification and as directed by Engr in charge.

Providing and laying of Polymer modified Single component, alkaline resistant fibre Reinforced, thixotropic, cementious patch repair mortar Renderoc SP 40 of Fosroc Make or equivalent that achieves compressive strength (BS 1881 Pt 116) >10 Mpa at 1 day and > 45 Mpa at 28 days, tensile strength( BS 6319 Pt 7)> 2.5 Mpa at 28 days, flexural strength (BS 6319 PT 3)> 7 Mpa at 28 days, Drying Shrinkage ASTM C 157-93, 28 days < 1000 Micro strain. 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, piles etc. where the thickness of application is average 30mm in patches as per specification after applying bonding coat (Bonding coat shall be payable separately). Item Rate is inclusive of material and labour, tools and tackles scaffolding and transportation etc. complete as per specification and as directed by Engr in charge.

Supplying & applying of Acrylic emulsion based curing compound Concure AB, Solids content (33+1%) as per (ASTM D1644: Drying time : < 4hrs @ 23`C(ASTM C135, M 8.3) complete all as specified and directed.

Providing & applying Elastomeric & Decorative acrylic waterproofing coating of Nitocote wall guard specific gravity: 1.29 ; Elongation(110 micron DFT) : > 100%, Breathability :22 gm/m2/day ; tensile strength @ 250 micron : >2.0N/mm2; crack bridging ability : passes >0.5mm width ; Adhesion strength : 1.3N/mm2 ; Coating thickness DFT in two coats ; 110 micron complete all as specified and directed.

Providing and applying high performance acrylic polymer modified cementitious damp-proof coating Nito proof Damp protect. Application temp. < 100`C; Adhesion to concrete > 0.8N/mm2 : Toxicity Non toxic; Intermediate coating time 4-6 Hrs: Curing time after 2nd coat 4-5 days complete all as specified and directed.

M&L for providing and applying plaster of paris putty of 2mm thickness over plastered surface to prepare the surface even and smooth complete all as specified and directed.

Removing old lime wash (if any), hacking for key, raking out joints of old brick work or stone work built in Cement or Cement line mortar : not previously plastered and scrubbing down with water etc to receive plaster complete all as specified and directed.

Removing excavated material exc 1.50Km but n.exc 5Km and depositting where directed complete all as specified and directed.

Taking down mud plaster on brick or stone walls, etc. including raking out joints, hacking for key scrubbing down with water, etc. complete all as specified and directed.

Addn reinforcement cutting, fabricating new reinforcement Fe-500 and fixing with old existing reinforcement which was reduced to 20% or more of its original diameter as provided in original structure and addn steels as directed by EIC as required welding or tying with 16 gauge annealed binding wire complete as per drawing and specification for heights as directed by EIC.

Providing and executing injection/ pressure grouting in cracks in the parent concrete by fixing PVC nipples at 150mm to 200mm distance or specified distances as per design and detailed specifications. Pressure grouting using low viscous epoxy grout Conbextrs EP 10(M) of Fosroc or equivalent having mix density 1060 Kg/m3. Compressive strength (ASTM D695)-60N/mm2 tensile strength (ASTM C 304-97) 20N/mm2. Flexural strength (BS 6319 part 4 )-45N/mm2. Pressure grouting shall be done at required pressure etc shall complete as directed by EIC. Payment shall be made on actual grout consumed complete all as specified and directed.

Dismantling wrought iron for mild steel work of any description not otherwise provided for complete all as specified and directed.

S&F for MS angle in post or vertical portion of fencing FE 410W in (grade FE 410W grade E-250 quality B shaped washer etc complete using ERW or induction purlins etc welded conforming to 151161-1979 grade SI-240 complete all as specified and directed.

M&L for preparation of new steel surfaces over 10 cm width or girth and applying with two coats of synthetic enamel paint over a coat of red oxide primer complete all as specified and directed.

Cutting holes into or through brick walls not exc 150 sqcm built in cement mortar or cement lime mortar complete all as specified and directed.

M&L for PCC 1:3:6 type C-1 using 20mm graded stone aggregate as for hold fast including necessary formwork complete all as specified and directed.

S&F galvanised 2 strand steel barbed wire 2.24 mm dia barbed with 2mm dia barbs at 75 mm spacings and straining and fixing to any type of standard rails strains-ing bolts including securing or trying at crossings with and provision of galvanised mild steel wire staples or steel pins, etc. as directed (each line wire to be measured) complete all as specified and directed.

S&F concertina coil galvanised razor type 45cm dia incl security point in crossing and provn of galvanised mild steel wire staple or steel pin complete all as specified and directed.

Demolition of brick work built in cement mortar including all quions arches, pillar etc but excluding ashalar fancing dressed stoen and pre-cast concrete articles.

M&L for brick work with fly ash bricks straight or curved on plan exc 6m mean radius built in cement mortar 1:6 complete all as specified and directed.

M&L for PCC (1:2:4) type B-1 (20mm graded aggregate) as in coping rounded or chamfered on edge including necessary formwork complete all as specified and directed.

Taking down cement plaster, any description from brick or stone walls etc. including racking out joints, hacking for key, scrubbing down with water complete all as specified and directed.

M&L for rendering 15mm thick in cement mortar (1:4) on fair faces of brick work or concrete surfaces of 05 mm thick cement plaster using water proofing compound @ 3% by weight of cement over 10mm plaster with finished even and smooth without using extra cement.

Supply only integral water proofing compound.

M&L for complete removal of existing treatment from old plastered sufaces and applying two or more coats of 100% premium acrylic emulsion paint having VOC less than 50gm/ltrs and UV resistance as per IS 15489:2004, Alkali & fungal resistant, dirt resistant exterior paint of required shade (Company Depot Tinted) with silicone additives @ 1.43 ltrs/10 Sqm over and incl priming coat of exterior primer applied @ 0.90 ltrs/ 10 Sqm over new surfaces complete all as specified and directed.

M&L for preparation of old steel surfaces not otherwise described over 10 cm width or girth and applying with one coat of synthetic enamel paint (1st grade quality) complete all as specified and directed. NOTE: Schedule of Credit for subject tender is Rs. 9,930.00

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