Carbon wrapping and Miscellaneous Civil works at APSARA and other buildings at south site, BARC, Trombay, Mumbai.

Strengthening and upgradation of concrete structures with min. 300 GSM unidirectional carbon fibre wrapping sheet of approved equivalent quality or product meeting technical specification with epoxy treatment including surface preparation i.e. Smoothening of surface, priming the substrate using approved Epoxy Primer applied by roller/brush, followed by application of approved epoxy saturant over the tack free primed surface. Carbon Fabric shall be completely impregnated in two coats of approved epoxy saturant, wrapped over the concrete structure at desired orientation using tamping rollers to avoid any air voids etc. and sprinkling quartz sand in the last layer of the saturant, making coving the corners of beam and slab junction rounded with the approved epoxy putty with a radius of min. 25 mm and Carbon Fibre anchors etc. as per detailed technical specifications and and as directed by the Engineer in charge. Note: 1. Refer Detailed Technical Specifications. 2. The measurement of coving and carbon fibre anchors will be paid separately under relevant item(s).

Making coving the corners of beam and slab junction rounded with the epoxy putty with a radius of 25 mm minimum

Demarking the locations of Carbon Fibre anchors on the newly wrapped RCC surfaces with proper spacing, drilling 10-12 mm dia and 75 to 100 mm deep holes, saturating the fixed end of Carbon Fibre anchor with epoxy resin and inserting anchors in the holes, spreading and pasting the 8 Carbon Fibre petals of anchor over the FRP with saturant, finishing, levelling with roller, etc. complete.

Providing minimum 2 mm thick FRP lining on existing RCC Column, beam, Roof Gutter/ slab and other structures / PCC / Brick wall / plastered surface from in side/out side by using two layer of fiberglass chopped strand mat and one layer of finish surface RPT mat with using suitable approved resin and approved shade including carrying out required surface preparation to receive FRP treatment by chipping, scrapping, grinding, removing damaged concrete surface if required and finally testing the integrity of the coat to suit site and as per Technical Specifications and as directed by the Engineer-in-charge.

Providing a smooth surface with bonding agent having a mixed density of 1.45 – 1.5 Kg /Litre and a pot life of minimum 2 Hours at 35 Dig C. It shall have an open time of 6 hours and shall become fully hard at 24 hours. It shall achieve a minimum compressive strength of 40 M/mm2 @ 7days when tested as per ASTM D 695 or BS 6319 Part 2 and a flexural Strength of 25 N/mm2 @ 7 Days when tested as per ASTM C- 550 or BS 6319 Part 3. It shall achieve a tensile strength of 15 N/mm2 @ 7 days when tested as per BS 6319 Part 7 or ASTM D 638. It shall achieve a slant shear bond strength of minimum 11 N/mm2 with concrete when tested as per ASTM C 881. It shall provide a coverage of around 2 – 2.5 Sqm per Litre. The Surface area shall be measured.

Providing & fixing 1 layer of 100 Gsm (100 X100 mm) Glass fiber mesh for the damaged concrete elements wherever necessary by clamping tightly using Rebars 6/8mm dia using Polyester anchor grout fixed at suitable intervals and tying with binding wire. ( Mode of measurement shall be Glass fiber mesh consumed.)

Drilling holes of 12 mm dia. about 75 mm deep as per 450 mm c/c or as per drawing. Cleaning the holes with compressed air and hole cleaning brush. Filling polyester resin in the holes as per manufturer spacing. Fixing the connector bar of 8mm dia in the hole 175mm long.

Providing and applying Corrosion Resistance Single Component, Polymer modified, fibre reinforced cementitious repair mortar having water powder ratio in the range of 0.16 and the mixed density of around 2.05 – 2.20 Gms/cc. The repair mortar shall achieve a minimum compressive strength of 45 MPa @ 28 days when tested as per ASTM C-109 and a flexural strength of 7 MPa when tested as per ASTM C 348. It shall achieve a minimum Adhesion Bond Strength of 2 MPa when tested on Standard Elctometer as per ASTM D 4541 – 85. The modulus of Elasticity shall be a minimum of 28 kN/mm2 when tested as per BS 1881. The Repaired area shall be measured.

Providing , centering ,shuttering Form work using PVC film faced plywood to get a neat form finish surface for all types of structures including necessary strutting, proping, staging, supports etc and deshuttering the same after the specified time all as per drawings, specifications and as directed by the Engineer-in-charge at all levels. For Super Structure

Providing 15 mm thick plastering using Ready mix internal plastering compound of approved make for internal faces of brickwork / concrete surfaces including preparation of the surface, curing, cleaning, scaffolding complete all as per specifications and as directed at site by the Engineer-in-charge