Strengthening Roof Slab and FRP treatment of Library part of Administrative / Chemical Building of Assam Engineering College, Guwahati under SOPD-G during the year 2024-25

Amount

Demolishing cement concrete manually/ by mechanical means including disposal of material within 50 metres lead as per direction of Engineer - in - charge. Nominal concrete 1:3:6 or richer mix (i/c equivalent design mix)

Cleaning of exposed concrete surface of sticking material including loose and foreign material by sand blasting with coarse sand followed by and including cleaning with oil free air blast as per direction of Engineer in charge.

Chipping of unsound/weak concrete material from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges,making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts all complete as per direction of Engineer-In-Charge 50mm average thickness

Providing and inserting 12mm dia galvanised steel injection nipple in honey comb area and along crack line including drilling of holes of required diametre (20mm to 30mm) up to depth from 30mm to 80mm at required spacing and making the hole & crack dust free by blowing compressed air, sealing the distance between injection nipple with adhesive chemical of approved make and allow it to cure complete as per direction of Engineer-In-Charge

Providing and injecting approved grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete/ masonry by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete as per directions of Engineer-inCharge Stirrer mixed Acrylic Polymer of approved make @ 2% of weight of cement used) modified Cement slurry made with non shrink compound in concrete/RCC work

Epoxy injection grout in concrete/RCC work of approved make

Grading roof for water proofing treatment with Cement concrete 1:2:4 (1 cement : 2 coarse sand :4 graded stone aggregate 20mm nominal size)

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Engineer-In-charge complete in all respect. Epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make

Cleaning of reinforcement from rust from the reinforcing bars to give it a total rust free steel surface by using alkaline chemical rust remover of approved make with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washing with water and allowing it to dry, all complete as per direction of Engineer-In-Charge. Bars upto 12 mm diameter

Bars above 12 mm diameter

Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-in-charge. 50 mm average thickness in 3 layers.

Providing and fixing to the inlet mouth of rain water pipe cast iron grating 15 cm diameter and weighing not less than 440 grams.

Polyurethane based waterproofing system Base preparation 1. Providing and laying water proofing treatment to horizontal and vertical surfaces of podium slabs, including cleaning the surface with wire brush, treating all surface cracks coving preparation at wall - slab joint and preparation of surface in all aspects to receive the waterproofing. 2- Application of Primer: Apply Epoxy based primer over well prepared surface at 150-200 gm per Sq.Mtr. 3-Providing and applying Single component moisture cured polyurethane Elastomeric liquid water proofing coating like Nitoproof 600 PF of Fosroc/ Aquarm WPU 1K(E) of MYK or equivalent to achive a DFT of 1 mm over the entire horizontal area extending upto 300mm on the parapet wall and then terminated. Sprinkling quartz sand @ 200 gm/m2 while second coat of PU coating is still tacky for providing mechanical grip to facilitate installation of plaster on the veriical walls. The membrane will have the following technical parameters: Tensile Strength : 2 N/mm2(ASTM D412) Elongation at break : 500 % (ASTM D412) Punture resistance : 90 N (ASTM D 4833) Adhesion to Concrete: >2.0 N/mm (ASTM D 903) 4- Providing and laying 150 Gsm Geo fabric membrane as separation layer

Providing & fixing Polyethylene joint filler board in expansion joints manufactured by M/s Supreme Industries Limited or equivalent. 500gms per sq. Mtr (Density not less than 30kg/cum) followed by Providing & fixing expansion joint tape of 2mm Thickness as per instruction of engineer in charge.

FRP Laminates on Slab:- Providing and lying a Externally Bonded Carbon Fibre Reinforced plate of thickness 1.4 mm in Iongitudinal direction at required spacing as per manufacturer specification. The carbon fibre plated should be installed after proper surface preparation application of primer and epoxy adhesive like Fosroc Nitowrap 40/ Rearm bond 4031 as instructed by the engineer in charge. The carbon fibre plates should have young's modulus more than 165000, elongation more than 7.7 0/o and tensile strength more than 2800 N/mm2. Cost inclusive of both design, application as per the satisfaction of engineer in charge,

Brick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in superstructure above plinth level up to floor V level in all shapes and sizes in : 6.4.1 Cement mortar 1:4 (1 cement : 4 coarse sand

Providing and laying cement concrete in retaining walls, return walls,walls (any thickness) including attached pilasters, columns, piers,abutments, pillars, posts, struts, buttresses, string or lacing courses,parapets, coping, bed blocks, anchor blocks, plain window sills, fillets,sunken floor etc., up to floor five level, excluding the cost of centering,shuttering and finishing: 4.2.2 1:1½:3 (1 cement : 1½ coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources).

Reinforced cement concrete work in walls (any thickness), including attached pilasters, buttresses, plinth and string courses, fillets, columns,pillars, piers, abutments, posts and struts etc. above plinth level up tofloor five level, excluding cost of centering, shuttering, finishing and reinforcement : 5.2.2 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources)

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete above plinth level. thermo-Mechanically Treated bars of grade Fe-500D or more.

Demolishing brick work manually/ by mechanical means including stacking of serviceable material and disposal of unserviceable material within 50 metres lead as per direction of Engineer-in-charge. 15.7.4 In cement mortar

Providing & fixing at all heights, levels and locations colour finish Aluminium alloy roofing sheets of alloy IS designation 31500, temper Hx8 conforming to IS 737 and dimensions as per IS code 2676 with characteristics of good formability and corrosion resistance. The profile sheets shall be fixed to truss members in slope or required pitch or curvature with Hex cap headed self drilling/tapping Stainless steel screws M6, 50mm long with 3 mm EPDM seal washer etc. all inclusive of labour, scaffolding, T&P and sundries etc. complete as per directions of the Engineer-In-Charge. (Cost of truss/frame work shall be paid separately). 0.56 mm, Aluminium Color coated troughed profile with center to center pitch of 200 mm, depth of 32 mm, overall profile width1092 mm, cover width 1000mm.

Steel work in built up tubular (round, square or rectangular hollow tubes etc.) trusses etc., including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer, including welding and bolted with special shaped washers etc. complete. 10.16.1 Hot finished welded type tubes

12 mm cement plaster of mix : 13.1.1 1:4 (1 cement: 4 fine sand)

Extra for providing and mixing water proofing material in cement plaster work in proportion recommended by the manufacturers.

Repairs to plaster of thickness 12 mm to 20 mm in patches of area 2.5 sq.meters and under, including cutting the patch in proper shape,raking out joints and preparing and plastering the surface of the walls complete, including disposal of rubbish to the dumping ground, all complete as per direction of Engineer-in-Charge. 14.1.1 With cement mortar 1:4 (1 cement : 4 fine sand)