Carrying out various Civil Engineering works for CED and other buildings and Biannual maintenance of Civil Engineering Laboratory at CED, North Site, BARC, Trombay for Year 2026-28

Providing & applying structural repairs with pre-packed dual shrinkage controlled (volume stable in wet & hardened state), single-component ready-to-use, structural grade high build, alkali-resistant, fibre-reinforced, thixotropic polymer modified repair mortar having excellent bond strength to old damaged concrete structures / surfaces in the following process: 1) Removal of loose/spalled or damaged concrete by chipping and cleaning the concrete surface to open up to 20mm behind the reinforcement steel with wire brush and with clean water 2) Cleaning the rebars with Acetone for complete rust removal and washing with water to make the surface clean. 3) Applying protective coat / bond coat using Styrene Butadiene Rubber (SBR) polymer and cement in the proportion of 1: 1 (1 part of polymer : 1 parts of cement). 4) Mixing full 25 Kg bag with clean potable water in water to product ratio of 0.12 to 0.18), mixed by heavy-duty slow speed (300 to 600 rpm) drill with spiral mixing paddle or forced action pan mixer pan for 3 minutes to achieve uniform lump free mortar consistency. 5) Applying polymer modified mortar with trowel & float. The polymer modified mortar shall have the following properties/technical parameters: (A) Properties / technical parameters of pre-packed Polymer Modified Mortar: i) Compressive strength 1 day: Min. 20 MPa (as per BS:6319 : Part 2)ii) Compressive strength 7 days: Min. 35 MPa (as per BS:6319 : Part 2) iii) Compressive strength 28 days: Min. 45 MPa (as per BS:6319 : Part 2) v) Tensile strength in 28 days: Min. 2.5 MPa (as per BS:6319 : Part 7) iv) Flexural strength in 28 days: Min. 7 Mpa (as per BS:6319 : Part 3) vi) Bond strength: Min. 5 MPa (as per ASTM : C881) vii) Water permeability: less than 1% (as per ASTM : C881) viii) Drying shrinkage in 28 days: less than 1000 microstrain (as per ASTM C 157-93) ix) Potential Alkali Reactivity : <0.1% Expansion % ( ASTM C1260) (B) Properties / technical parameters of SBR polymer bond coat material: i) Meets the requirements of BS 6319 part 2:1983 & ASTM C 190-85 standards ii) Total solids % by mass at 105oC: 38 + 1 iii) pH value: 7.5 to 9.5 iv) Specific gravity at 27.5oC: 1 to 1.05 v) Coverage: 4.2 - 4.5 sq.m/kg per coat Notes:- (a) If ambient temperature is more than 30oC, use chilled water for mixing and store unused product in shed. Placing and 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, columns, etc. (b) If thickness of repair exceeds 20mm , after every 20 mm thick repair, bond coat as per process no. (3) mentioned above in the BOQ item, to be applied and further thickness of repair to be continued for each layer. (c) The surface preparation & method of application shall be as per manufacturer's technical data sheet. (d) The double tubular steel scaffolding will be paid separately in relevant item. (e) Safety Precuations:- Use wear tight-fitting, dust-resistant, chemical splash goggles and dust respirator, if airborne dust is generated, wear protective rubber hand gloves, wear appropriate clothing to prevent any possibility of skin contact. The above item of work is inclusive of all materials, SBR polymer, labour, machinery, tools & tackels, consumables, trasportation, loading & unloading, safety PPEs etc. all complete as directed by Engineer-in-charge at site using approved pre-packed polymer modified mortar suitable for structural repair works.

Providing, centering, shuttering Form work for sub-structure 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.

Providing, centering, shuttering Form work for super-structure 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.

Providing and laying in position cement concrete of 1:3:6 (1 cement, 3 crushed sand, 6 graded stone aggregate of maximum size 20 mm) with minimum cement content as per the latest revision of relevant IS codes including consolidation, finishing, curing etc. complete as per specifications and drawings but excluding the cost of Form work shuttering, centering Complete at all levels.

Providing and laying in position Reinforced Cement Concrete (RCC) of grade M-30 with minimum cement content as per the latest revision of relevant IS codes using 20mm maximum size aggregates and crushed sand of approved quality including admixtures of approved quality (plasticiser or super plasticiser) if required, including weigh batching, mechanical mixing, transporting, placing, vibrating, consolidation, finishing, curing etc. complete but excluding the cost of centering, shuttering and reinforcement complete as per specifications up to Plinth Level.

Providing and laying in position Reinforced Cement Concrete (RCC) of grade M-30 with minimum cement content as per the latest revision of relevant IS codes using 20mm maximum size aggregates and crushed sand of approved quality including admixtures of approved quality (plasticiser or super plasticiser) if required, including weigh batching, mechanical mixing, transporting, placing, vibrating, consolidation, finishing, curing etc. complete but excluding the cost of centering, shuttering and reinforcement complete as per specifications in superstructure at all levels upto 20 m above plinth level .

Providing Reinforcement Steel for reinforced cement concrete at all levels including supplying, preparation of bar bending schedules, cutting, bending, transporting, fixing, tieing in position with PVC coated G I binding wire of minimum 16 Gauge (Excluding PVC coating), all labour charges, cost of cover blocks in specified grade of concrete etc. complete as per specifications and drawings. Steel supplied by the contractor. Using TMT bars of Fe-550D grade or as approved of all sizes of approved make or approved equivalent meeting the technical specifications as per relevant codes and standards. TMT bars to be supplied by the contractor shall conform to IS – 1786 (Latest edition) and BARC specification. Notes: (1) The contractor shall supply documentary evidence of purchase of steel, Test certificate from approved manufacturers or approved equivalent meeting the technical specifications as per relevant codes and standards and also testing third party from approved laboratories without any extra cost. (2) Binding wire required for the work will have to be supplied by the contractor at their own cost and will not be measured for payment. (3) Cover blocks shall be of same grade of concrete.

Providing and constructing Half brick masonry using Flyash/ Flyash Lime bricks with minimum 70 kg / Sq.cm strength of approved size and approved make or approved equivalent meeting the technical specifications as per relevant codes and standards in partition walls in C.M 1:4 (using crushed sand) including scaffolding, raking out joints, curing etc. complete and with stiffners of RCC 1:2:4 (105 X 75 mm size) at every 900 mm height including form work curing etc. complete as per specifications but excluding reinforcement in Super Structure up to Floor - II level. (Reinforcement will be paid under relevant item)

Providing and constructing brickwork in cement mortar 1:6 using crushed sand with Flyash/ Flyash Lime bricks with minimum 70 kg/ Sq.cm strength of approved size and approved make or approved equivalent meeting the technical specifications as per relevant codes and standards in super structure above plinth up to and including Floor II level including, scaffolding, raking out joints, curing, cleaning complete all as per specifications and drawings.

Providing 15 mm thick plastering using Ready mix internal plastering compound of approved make or approved equivalent meeting the technical specifications as per relevant codes and standards 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.