Repairs and Renovation Works

SUPPLYING AND ERECTING SINGLE/DOUBLE BAMBOO ALONGWITH HASSION CLOTH SCAFFOLDING:- Supplying and erecting Single or double bamboo scaffolding as per site conditions along with hassion cloth as required with verticals @ 1.2m to 1.8m c/c inner as well as outer faces and horizontals and braces on the Building structure or any other places without any puncher to wall surface etc. including the removal of scaffolding after completion of the work etc. all complete as per the direction of Consulting Engineer / in-charge.Rate Inculding providing and fixing full cover hassion cloth vertical surface of the buidling for entire execution of work and necessary safety nylon net fixing on horizontal surface in the premises as required location. NOTE- MODE OF MEASUREMENT OF SCAFFOLDING WILL BE AS PER BUILDING LENGTH IN PERIPHERI & HIGHT UP TO PARAPET WALL LEVEL. ITEM OF SCAFFOLDING WILL BE PAID ONLY ONE TIME FOR THE ENTIRE WORK EXECUTION. FOR ERECTION OF SCAFFOLDING WILL PAID 50% OF QUOTED RATE AND REMAIN 50% WILL BE PAID AFTER REMOVEING THE SAME BILLING WILL BE AS PER THE EXECUTED QUANTITY AND MEASUREMENT.

DOUBLE SCAFFOLDING SYSTEM (cup lock type): Providing and fixing double scaffolding system (cup lock type) on the exterior side of G + 13 storeyed building/structure for all heights above ground level, including additional rows of scaffolding in stepped manner as per requirement of site, made with 40mm dia M.S. tube, placed 1.5 metre centre to centre, horizontal & vertical tubes joint with cup & lock system with M.S. Tubes, M.S. tube challis, M.S. clamps and staircase system in the scaffolding for working platform, net for capturing falling debris, hessian fabric cloth ( having opaqueness > 90 % ) for safety etc. and maintaining it in a serviceable condition during execution of work of cleaning and/ or pointing and/ or applying chemical and removing it thereafter. The scaffolding system shall be stiffened with bracings, runners, connecting with the building etc, wherever required, if feasible, for inspection of work at required locations with essential safety features for the workmen etc., complete as per directions and approval of Engineer-in-charge. Note:- (1) The elevational area of the scaffolding shall be measured for payment purpose. (2) The payment will be made once (one time) only for execution of all the items of works requiring scaffolidng (3) No extra/additional payment shall be made for removal and refixing of scaffolding, if done by the contractor for any reason/s. (4) Entire scaffolding material used shall be the property of the contractor and shall be removed and taken away by the contractor after completion of work. (5) Any damages to the wall and other parts of the building caused due to the fixing and removing of scaffolding shall be repaired by the contractor on his own cost. Rate Inculding providing and fixing full cover hassion cloth vertical surface of the buidling for entire execution of work and necessary safety nylon net fixing on horizontal surface in the premises as required location. NOTE- MODE OF MEASUREMENT OF SCAFFOLDING WILL BE AS PER BUILDING LENGTH IN PERIPHERI & HIGHT UP TO PARAPET WALL LEVEL. ITEM OF SCAFFOLDING WILL BE PAID ONLY ONE TIME FOR THE ENTIRE WORK EXECUTION. FOR ERECTION OF SCAFFOLDING WILL PAID 50% OF QUOTED RATE AND REMAIN 50% WILL BE PAID AFTER REMOVEING THE SAME BILLING WILL BE AS PER THE EXECUTED QUANTITY AND MEASUREMENT.

WINDOW COVERING : Providing and fixing 6 mm thick old/ new commercial plywood in servicable condition with new/ old jungle wood frame work of 50 x 35 mm size at 60 cm on One ways for closing the window portion/openings for protection from falling debris, dust etc. including cutting, fixing with nails and removing after the same after completion of the work. (In event of any damage to existing windows, shall be the same shall be repaired by the contractor on his own cost)

REMOVAL OF EXISTING CEMENT PLASTER:- Dismantling/ Removal of the existing old plaster (both internal and external) of any thickness and at all levels by chisel & hammer / cutter plate or skirting including raking out joints and cleaning the surface for re-plaster. Rates quoted to include removing all debris, spalls, including cleaning the site, lowering down the debris to the ground without causing dust nuisance and damage to the structure and disposing & carting away the debris outside the building compound upto the municipal dump site with necessary municipal permision with all lead and lift.

BREAKING/CHIPPING LOOSE CONCRETE:- Chipping and removing the loose/ unsound/ weak concrete with manual chisel and/ or by standrad power driven percussion type of approved make equipment upto reinforcing bars, without removing the reinforcement, including tapering of all edges, making square shoulders of cavities, removing all the loose materials, cleaning the surface by water jet pressure pump to make all the exposed surface free from dust, oil and all impurities, etc. and air drying the surface, etc. complete as directed for all locations. Including disposing & carting away the debris outside the building compound upto the municipal dump site with necessary municipal permision with all lead and lift.(Note:-Exposed Surface area prepared for repair of structural member shall be considered for payment) Only the damaged area of concrete will be measured.

REMOVAL OF EXISTING WATERPROOFING: Removing the existing waterproofing layers of china mosaic flooring/screed of any thickness on the existing terrace including surface prepration & cleaning it. Rates shall be quoted to include removing all debris, spalls, including cleaning the site, lowering down the debris to the ground floor without causing dust nuisance and damage to the structure and disposing & carting away the debris outside the building compound upto the municipal dump with required municipal permision with all lead and lift, etc. complete as directed.

STRUCTURAL POLYMER REPAIR (UPTO 15mm THICKNESS): Repairing to the existing RCC structural members (vertical or horizontal) using ready mix Polymer Modified Mortar (Fibre reinforced structural grade repair mortar) of approved brand where the thickness of repair is upto 15 mm. It can be used for carrying out extensive repairs to beams, columns, slab, and other structural elements, repairing of structural members subjected to repetitive loading for strengthening. Procedure for carrying out repair Polymer Modified Mortar - Surface preparation- (separate payment shall be made ) All loose traces of concrete or mortar, dust, grease oil, etc. must be removed. Damaged or contaminated concrete shall be removed to obtain a keyed aggregate exposed surface. Non-impact/ vibrating cleaning methods, e.g. grit or high pressure water blasting are recommended. Clean all exposed reinforcement to a minimum grade of Sa 2 according to ISO 8501-1 / ISO 2944-4. Ensure all visible portions of the reinforcing bar is clean. Where reinforcing bars are corroded, cut back the concrete around the reinforcing bars, Grit blast to remove corrosion products from around reinforcing bars and coat with approved epoxy coating for corrosion protection or any other protective coating as recommended by the Structural Engineer to protect from corrosion. Replace the affected part of rebar if the diameter after grit blasting is found reduced by more than 20% of the original diameter on the advice of the structural engineer responsible for the works. Bond Coat- (separate payment shall be made only for bond coat used for old surface to new surface) Providing & applying One coat of structural grade epoxy bond coat by brush conforming to ASTM-C-882-87 to the prepared concrete surface to be repaired / strengthened and repairingwith PMM shall be done when the surface is tacky. Mixing -Only full bags are mixed. Damaged or opened bags should not be used. Mix the ready-mix Polymer Modified Mortar in a forced action pan mixer, or with a helical paddle attached to a low speed (300-600rpm) mixer for 3 minutes until a lump free, thixotropic consistency is achieved. Only use clean water. Mixing water needed: 3.75 to 4.25 litres per 25kg bag or as recommended by the Manufacturer of Polymer Modified Mortar. Allow the mortar to rest for 2 - 3 minutes and then nremix briefly before pouring into formwork. If temperature more than 40°C then use chilled water for mixing. Mortar application- The minimum temperatures must be maintained duringapplication and for at least 24 hours thereafter for optimumcuring of the product. The prepared substrate should be presoaked, preferably for 24 hours, but at least 2 hours beforeapplying Polymer Modified Mortar. The surface must besaturated surface dry, but without standing water. PolymerModified Mortar can be spray- or hand-applied. Apply mixedproduct directly to the prepared damp substrate, or wet on wetonto the primed surface. Spraying the material with the necessary pressure will ensure good adhesion o fthematerial.A thin scrape coatorcontac tlayer before building upto ther equired thickness, wet on wet, will improveadhesionespecially in case of hand application. Apply to the desiredlayer thickness upto 15 mm and level using a screeding bar,trowel or woodenboard. Smoothing with a trowel or finishingby float or sponge can be done as soon as the mortar hasbegun to stiffen. Protective coatings - Subsequent coatings of any anticarbonation barriers or silaneimpregnationsshouldbeapplieifrecommendedbytheStructural Engineer.Plaster- (No separate payment shall be made).The repaired surface shall be matched to the surroundingsurface by providing required thickness of plaster internal orexternal plaster.CuringMinimum 7 days curing shall be done to the newly repairedareausingany suitablemethodRequiredCompressivestrength(ASTC1097cmcube)ReadyMixPolymerModifiedMortar used on site shall besentfortestingofcompressivestrengthandminimumstrengthrequired to be achieved is as follows – 1 Day-15 MPa, 3 Day-25 MPa, 7 Day-35 MPa, 28 Day-45 MPa. Surface Coating - Providing surfsce coating of polymer after completion of structural repair work.

STRUCTURAL POLYMER REPAIR (From 15mm to 30mm THICKNESS): Repairing to the existing RCC structural members (vertical or horizontal) using ready mix Polymer Modified Mortar (Fibre einforced structural grade repair mortar) of approved brand where the thickness of repair is upto 30 mm in two layers. Itcan be used for carrying out extensive repairs to beams, columns, slab, and other structural elements, repairing of structural members subjected to repetitive loading for strengthening. Procedure for carrying out repair Polymer Modified Mortar - Surface preparation- (separate payment shall be made )All loose traces of concrete or mortar, dust, grease oil, etc.must be removed. Damaged or contaminated concrete shallbe removed to obtain a keyed aggregate exposed surface.Non-impact/ vibrating cleaning methods, e.g. grit or highpressure water blasting are recommended. Clean all exposedreinforcement to a minimum grade of Sa 2 according to ISO8501-1 / ISO 2944-4. Ensure all visible portions of thereinforcing bar is clean. Where reinforcing bars are corroded,cut back the concrete around the reinforcing bars, Grit blast toremove corrosion products from around reinforcing bars andcoat with approved epoxy coating for corrosion protection orany other protective coating as recommended by theStructural Engineer to protect from corrosion. Replace theaffected part of rebar if the diameter after grit blasting is foundreduced by more than 20% of the original diameter on theadvice of the structural engineer responsible for the works.Bond Coat- (separate payment shall be made only for bondcoat used for old surface to new surface)Providing & applying One coat of structural grade epoxy bondcoat by brush conforming to ASTM-C-882-87 to the preparedconcrete surface to be repaired / strengthened and repairingwith PMM shall be done when the surface is tacky.Mixing - Only full bags are mixed. Damaged or opened bags should notbe used. Mix the ready-mix Polymer Modified Mortar in aforced action pan mixer, or with a helical paddle attached to alow speed (300-600rpm) mixer for 3 minutes until a lump free,thixotropic consistency is achieved. Only usec leanwater.Mixing water needed: 3.75 to 4.25 litres per 25kg bagorasrecommendedManufacturerofPolymerModifiedMortar.Allowthemortar to rest for 2 - 3 minutes and thenremix briefly beforepouring into formwork. If temperature morethan 40°C then use chilled water for mixing.Mortar application- The minimum temperatures must be maintained duringapplication and for at least 24 hours thereafter foroptimumcuring of the product. The prepared substrate should be presoaked,preferably for 24 hours, but at least 2 hours beforeapplying Polymer Modified Mortar. The surface must besaturated surface dry, but without standing water. PolymerModified Mortar can be spray- or hand-applied. Apply mixedproduct directly to the prepared damp substrate, or wet on wetonto the primed surface. Spraying the material with thenecessary pressure will ensure good adhesion of the material.A thin scrape coat or contact layer before building uptotherequiredthickness,wetonwet,willimproveadhesionespeciallyincaseofhandapplication.Applytothedesiredlayerthickness upto 15 mm in single layer and after hardening,provide second layer of required thickness (total upto 30 mm)and level using a screeding bar, trowel or wooden board. Ifrequired, bond coat shall be provided as per therecommendation of manufacturer between two layers ofpolymer Modified Mortar and no separate payment shall bemade for it. (However, between old & new surface of concretebond coat shall be applied & paid separately) Smoothing witha trowel or finishing by float orsponge can be done as soon asthe mortar has begun to stiffen.Protective coatings Subsequent coatings of any anticarbonation barriers or silaneimpregnationsshouldbeapplieifrecommendedbytheStructural Engineer.Plaster- ((No separatepaymentshallbe made))The repaired surface shall be matched to thesurroundingsurface by providing required thickness of plaster internal orexternal plaster.CuringMinimum 7 days curing shall be done to the newlyrepaired/jacketed area using any suitable method.Required Compressive strength (ASTM C109 7cm cube)Ready Mix Polymer Modified Mortar used on site shall be sentfor testing of compressive strength and minimum strengthrequired to be achieved is as follows – 1 Day-15 MPa, 3 Day-25 MPa, 7 Day-35 MPa, 28 Day-45 MPa. Surface Coating - Providing surfsce coating of polymer after completion of structural repair work.

MICRO CONCRETE: Repairing the existing damaged RCC structural members (vertical or horizontal) or strengthening it by supplying & applying ready mix Micro Concrete of approved brand & make conforming to EN1504 Part 3 (Properties: 28 days compressive strength ≥ 55 MPa and Bond Shear Strength ≥ 10 MPa at 14 days), where the thickness of repair is more than 30 mm and upto 115 mm when the epoxy bond coat is tacky, including supplying & applying bond coat ???, cost of fixing and removal of good quality shuttering or forms treated with a chemical release agent and braced to withstand the pouring pressure, pouring the microconcrete in forms at all levels & heights, proping, finishing the surface, curing, etc. complete as directed. The quoted rate shall include cost of all these necessary operations relating to extensive repairs to beams,columns and other structural members. For repairs beyond 80mm to 115mm in thickness, extend Ready Mix Micro Concrete with up to 25kg of 5-12mm sized washed, saturated surface-dry (SSD), graded low absorption, high density aggregates. The microconcrete shall be mixed, applied and cured as per the manufacturer's technical specifications (Note: Payment is to be made by weight premixed of micro concrete product consumed as per site register records)