ADDITION and ALTERATION AND SPECIAL REPAIRS TO BLDG NO. P-17 AT INS SHIKRA UNDER GE (NW) NOFRA

SCHEDULE 'A' PART I-B/R WORKS Taking down cement or cement lime plaster, any description, on brick or stone walls, etc. including raking out joints, hacking for key, scrubbing down with water, etc., and including removal of all resulting rubbish and debris off MD premises, complete all as specified and directed.

Material & Labour for Chipping/removing of concrete carefully by using low impact hammer without causing any damage to the existing structural members, reinforcement, embedded services or adjoining surfaces, including controlled breaking of concrete, manual dressing of edges, collection, loading, transportation and disposal of debris outside the premises as directed by the Engineer-in-Charge. Note: The work shall be carried out in a controlled manner and hard concrete shall not be removed by force or by methods causing vibration/damage to the structure.

Demolition of reinforced cement concrete, any description and in any position, including cutting reinforcement as required to facilitate demolition, and including disposal of rubbish off MD premises, complete all as specified and directed

Demolition of brickwork or stone/boulder masonry built in cement mortar or cement lime mortar, including all quoins, arches, pillars, etc. but excluding ashlar facings, dressed stonework and precast concrete articles,including removing debris and rubbish off MD premises complete all as specified and directed.

Materials and Labour for brickwork with sub-class ‘B’ bricks, straight or curved on plan exceeding 6m mean radius, built in cement mortar (1:4), complete all as specified and directed.

Materials and Labour for brickwork with sub-class ‘B’ bricks, straight or curved on plan to any radius in half-brick thick walls, built in cement mortar (1:4), complete all as specified and directed.

Material and labour for cleaning existing exposed reinforcement bars by manual/mechanical wire brushing using rotary wire brush to remove all loose rust, scales, laitance, dirt and foreign materials and preparing the surface to bare metallic finish, including application of two coats of alkaline rust converting/passivating primer conforming to ASTM B-117 (FEOVERT or equivalent approved make) on cleaned reinforcement bars. The second coat shall be applied after a minimum interval of 6 hours or as per manufacturer’s specification. The item also includes application of protective coating (IPNET-RB or equivalent approved make) complete, strictly as per manufacturer’s specifications and as directed by the Engineer-in-Charge. Note:Rates quoted shall include all labour, materials, tools & plants, scaffolding, disposal of debris outside the premises and all incidental works complete as directed by the Engineer-in-Charge.

Providing, cutting, bending, placing and binding in position TMT(CRS) reinforcement bars of approved grade and diameter as directed, in replacement of existing corroded/damaged reinforcement where reduction in cross-sectional area of existing reinforcement exceeds 30% due to corrosion, including careful cutting and removal of deteriorated reinforcement, surface preparation, lapping/welding/binding with existing reinforcement as per structural requirements, including all labour, tools, tackles and incidental charges complete as specified and directed by the Engineer-in-Charge. Note : Measurement shall be made on the basis of actual weight of new reinforcement provided.

Material and labour for applying bi-polar migratory corrosion inhibitor (EPCO-KP-100/Protectsil CIT/Ferrogard 903 or equivalent approved make) on prepared concrete surface, capable of penetrating through concrete pores up to 100 mm depth and inhibiting corrosion of embedded reinforcement by forming protective layer on anodic and cathodic areas, including surface preparation and application complete as per manufacturer’s specifications and as directed by the Engineer-in-Charge.

Material & labour for Drilling and fixing Rohibb Teflon nozzles in RCC members, including drilling holes of 12mm dia, 50 to 100mm deep holes. Works shall be carried out as under :- (i) Cleaning of holes. Clean the holes by air blower prior to fixing nozzles. (ii) Fixing of nozzles. Insert 12mm dia. Rohibb Teflon nozzles in cleaned holes. External end of nozzles to be machine to receive outlet of grouting gun.Fix it inside the holes by applying thixotropic epoxy putty to ensure complete sealing. Cure the system for minimum 12 hrs. (iii) Cutting of nozzles. Cut the nozzles by chisel after completion of grouting without damaging structural elements. (iv) In case crack upto 2mm wide, fix the injection nozzels directly over the cracks, at intervals of 6 to 9 inches, using a drilling machine. Fix PVC/MS nozzels in these holes with fast-setting epoxy putty & let it dry for 2 to 3 days. Also, seal the crack between the ports with epoxy putty. (v) In case where the crack is wider than 2mm upto 4 to 5mm, drill holes at the sides of the crack in a staggered fashion, at intervals of 6 inches and affix them with epoxy putty as mentioned above. (vi) Also, seal the face of the crack with a liberal application of the epoxy putty.