SPECIAL REPAIR TO CERTAIN E/M AND B/R WORKS IN ELECTRIC SUPPLY INSTALLATIONS AT KANCHRAPARA MIL STN UNDER GE BARRACKPORE

Taking down all existing roof treatment and demolition of cement concrete padding/levelling course (any thickness as available in site) including wire brushing and cleaning loose dust etc from surfaces of RCC roof including flashing and junction of parapet complete all as specified and as directed.

M&L for 40mm thick PCC 1:2:4, type B0 (using 12.5mm size graded crushed stone aggregate) as levelling course, padding on chajjas, etc including angular moulding at junction upto 10cm height mixed with WPC as per manufacturer's instruction, applied over prepared surfaces complete all as specified and directed. Note : (i) WPC shall be measured and paid separately as supply only. (ii) PCC shall be laid to achieve true slope towards the drain/weep holes.

M&L for preparation of RCC roof surface or wall & floor of sunken slab by cleaning the entire roof with Pressure water jet to remove the unwanted dust, loose material or any other material which may impair adhesion of the material. Surface must be cleaned and dried properly so that any cracks on the substrate can be visible. Concrete substrate to be cleaned up to exposed sound concrete cover, remove dust, laitance etc, which may impair adhesion of the material. All surface cracks up to 1-2 mm wide should be filled with single component cold applied elastomeric waterproofing coating (Dr. Fixit Roof Seal Ultra or equivalent) using a brush and adding a coat on the slab on both sides of the crack, up to a distance of 100 mm around it. Cracks more than 1-2 mm should be widen by making V-groove and repaired with PMM (Polymer Modified Mortar) using Dr. Fixit Pidicrete URP or equivalent 10% by weight of cement complete all as specified and as directed. Note : (i) Finished surface shall be as per satisfaction of Engr-in-Charge. (ii) All cracks shall be prepared and checked by Engr-in-Charge before and after treatment for the satisfaction and rates quoted shall be including the quantum of cracks in proposed surfaces which shall be checked on ground by the contractor before quoting bid. (iii) No additional amount shall be claimed further for repairing cracks. (iv) Entire application shall be carried out by trained certified manufacturer applicator only.

Supply only Nanotechnology based Elastomeric Hydrophobic Powder/admixture (EHP) powder for cement plaster and concrete complete all as specified and directed.

M&L for single component cold applied elastomeric waterproofing coating (Dr. Fixit Roof Seal Ultra or equivalent) on in-accessible/accessible roof or wall & floor of sunken slab based on synthetic resin emulsion, tough yet extremely flexible coating that can be efficiently applied by roller or squeegee having following important features : (i) High film build up provides excellent water resistance. (ii) Excellent flexibility and elongation properties - can easily accommodate all normal building movements. (iii) Can be applied to complex shapes to form a seamless and highly durable water proofing coating. (iv) Adheres firmly to most of building surfaces incl both horizontal and vertical surfaces of parapet, etc. (v) Suitable consistency for easy application by brush, roller or squeegee. Single component cold applied elastomeric waterproofing coating (Dr. Fixit Roof Seal Ultra or equivalent) shall be applied by sprinkling some water over the roof just before application of 1st coat @ 0.75 ltrs/Sqm uniformly over the entire flat surface and vertical parapets including reinforcing fiber (45 gsm Glass fiber mesh) and allow for drying for 12 hrs and 2nd coat @ 0.75 ltrs/Sqm shall be applied (perpendicular direction of 1st coat as per manufacturer's instruction) on dried 1st coat complete all as specified. Note : (i) Entire application shall be carried out by TRAINED CERTIFIED MANUFACTURER'S APPLICATOR only. (ii) Waterproofing treatment shall cover min 10 yrs WARRENTY by the applicator and Contractor. (iii) Quoted rates shall include WATER PONDING TEST : After full drying of second coat for at least 72 hrs, a water ponding test can be performed by filling water on the terrace by carefully blocking all the down take drain outlets without damaging the coating. The test shall be carried out for 48 hrs by filling water up to 50 mm level. Observe for leakages, if any, and then remove the water and allow the coating to dry completely for handing over of site. (iv) Application shall be restricted in open sunlight having temperature above 35°C.

Cutting/Demolition/dismantling of loose/damage/disintegrated concrete including plaster of any description and in any position from RCC structures like chajja, fins, roof/ceiling, louvers, parapet, column, beam, lintel, etc using manual chipping tools/breakers without disturbing stability of structure with necessary scaffolding where required including cutting reinforcement to facilitate demolition/dismantling complete and dispose off debris outside MoD land complete all as specified and as directed.

Cleaning with Nano bio wash the existing surface of concrete and reinforcements as obtained after execution of item No. 6 here in before by wire brush including scrapping & cleaning with emery paper or by air blasting or sand blasting incl foreign martials, loose concrete/aggregate etc and washing down with water as required complete all as specified and as directed.

M&L for providing and placing in position free flow non shrink cementitious micro Nano-concrete of Grade M-50 for effected RCC beam, column, chajjas, fins/drops, staircase, etc. complete using necessary formwork (where applicable) after due treatment/coating of existing concrete with High Penetration, high adhesion shorter chain Nano epoxy bond adhesive and reinforcement surfaces with High Penetration, high adhesion shorter chain with high anti corrosive Nano Epoxy Zinc rich primer. Note : (i) Nano micro-concrete shall have a min 1 day compressive strength of 10 Mpa and 28 days strength of 50 Mpa including min tensile strength of 5N/mm² at 28 days and min flextural strength of 5N/mm² at 28 days. (ii) Nano micro-concrete shall be prepared in proportion of (1Part) Nano cement : (0.5 Part) Sand (packed graded sand of same make) : (1 Part) Aggregate (packed graded sand of same make) : (0.1 Part) Nano shorter chain water based epoxy base : (0.1 Part) Nano shorter chain water based epoxy Hardener : (0.02 Part) Nano Admixture : (0.3 to 0.4 Part) Water : (0.01 Part) EHP Powder. (iii) Necessary formwork shall be removed after 48 hrs and curing shall be done as per manufacturer instructions. (iv) Necessary formwork, TMT bars (where required), treatment with High Penetration, high adhesion shorter chain Nano epoxy bond adhesive and High Penetration, high adhesion shorter chain with high anti corrosive Nano Epoxy Zinc rich primer shall be measured and paid extra under respective items.

M&L for providing single coat of High Penetration, high adhesion shorter chain Nano epoxy bond adhesive on prepared non metallic surface (existing surface), applying by brush all as per manufactures instruction/specification. The bonding agent shall have minimum compressive strength of 40 N/Sqmm complete all as specified and directed by Engr-in-charge.

M&L for applying of High Penetration, high adhesion shorter chain with high anti corrosive Nano Epoxy Zinc rich primer on the steel surface by brush the primer shall have a minimum specific gravity 1.75 minimum weight film thickness/coat 40 microns and minimum adhesive bond strength with steel is 1.5N/mm2 including cleaning and removing loose concrete from steel surface complete all as specified and directed by Engr-in-charge. Note : (i) Surface area of existing reinforcement - 25mm width and length of bar treated (ii) Surface area of new reinforcement - circumference of bar and length