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| 1 | Demolishing R.C.C. work manually/ by mechanical means including stacking of steel bars and disposal of unserviceable material within 50 metres lead as per direction of Engineer - in- charge. |
| 2 | Chipping/Removing: Removing/chipping upto 40 mm average depth and cleaning of existing loose concrete carefully by manual or low impact frequency hammer without damaging the existing concrete including cleaning the surfaces by compressed air jet complete including removing loos concrete around the reinforcement. The debrish will be disposed upto lead of 100m. The entire surface will be checked by light hammering (using 1Kg hammer) for detection of loose concrete. Edge of chipped patch will bear vertical/reverse cut with minimum depth at edge as 10mm. (Prepared patches to be got checked before applying bond coat). All loose/sound concrete around corroded reinforcing bars has to be removed to prepare well defined patch. |
| 3 | NRV Packers: Drilling and fixing NRV nozzles in RC members including,Drilling Holes: Drilling 14 mm dia., 75 mm deep holes in structural members at the interval 200-300mm C/C in staggered manner as per the method statement. Cleaning of holes: Cleaning the hole by air blower prior to fix nozzle.Fixing of nozzles: 12mm dia NRV Non-plastic nozzels in cleaned holes with the help of epoxy resin. Cutting of nozzles : Cut the nozzle by cut wheel after completion of grouting without damaging structural elements. |
| 4 | Epoxy Grouting: Sealing of cracks/porous concrete by injection process through NRV injection packers complete as per technical specifications using brand of two component low viscosity (<350 centipoise (cps)) epoxy resin (STP/BASF/SIKA/Fosroc or Equivalent) |
| 5 | Derusting/Cleaning of Reinforcement: Cleaning of reinforcement of total rust including from behind the reinforcing bars to give it totally rust free finished steel surface, by manual methods and using approved rust remover (Make of STP/BASF/SIKA /Fosroc) whereever required (cost of rust remover included). For measurement surface area of repair work will be taken |
| 6 | Additional Steel for repair: Providing additional steel reinforcement to damaged structural elements including anchoring/welding, bending, placing etc, excluding the basic rate of steel. |
| 7 | Anticorrosion: Anticorrosive treatment to exposed reinforcing bars in two coats using approved anticorrosive product (BASF/STP/ SIKA/ Fosroc/Krishna Conchem or Equivalent). For measurement, square metre of concrete area for repairs |
| 8 | Bond Coat: Providing and applying epoxy resin bonding agent which shall be a solvent free epoxy based two component resin system (Make of SIKA/STP/BASF/Fosroc). The bonding agent shall be applied by brush & should remain in tacky state after application for a minimum period of 5-6 hrs @ 30 deg C. Product shall achieve 10 N/mm2 shear strength as per BS 6319 standards. |
| 9 | Polymer Modified Mortar: Providing and applyinga single component, readymix powder mortar(Make of SIKA/STP//BASF/Fosroc) in 40 mm thickness, which requires only the addition of clean water to produce a highly consistent, hand and spray grade, repair mortar. W/P ratio shall be maintained 0.18. Applied mortar shall achieve 20 mpa in 1 day and shall compensate drying shrinkage <1000microstrain as perASTM C-157-93 at 28 days.Note: rate of varying thickness can be calculated on pro rata basis. |
| 10 | Centering and shuttering including strutting, propping etc. and removal of form for Reconstruction |
| 11 | Polymer Modified Concrete Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : 1:1:2 (1 Cement : 1 coarse sand : 2 graded stone aggregate 20 mm nominal size)Also providing SBR Latex (STP/BASF/ SIKA/ Fosroc or Equivalent)) @ 20% by weight of cement. |
| 12 | Poviding and laying single componenet, dual shrinkage compensated, cementitious micro concrete manufactured by reputed manufacturer(STP/BASF/Fosroc or Equivalent) that achieves minimum 30 MPa at 28 days when tested as per ASTM C109 using form and pour method inclusive of manpower, material and equipment. |
| 13 | Strengthening structural elements with non metallic composite fiber wrapping system (TYFO Fiber wrap of M/s FYFE & Co., GOLD BOND 1893 of M/s Krishna Conchem Products Pvt. Ltd OR EQUIVALENT) comprise of uni-directional E -glass fiber sheet (900 GSM) and compatible epoxy saturant , by wet layup system including, Surface preparation: Grinding/ moulding concrete substrate, cleaning it with wire brush removing oil, laitance if present, rounding sharp edges to min 25 mm radius etc. complete. Profiling: Applying compatible primer on prepared substrate, Filling the holes and uneven surface with thixotropic putty etc. complete Wrapping: Wrapping the fiber sheet to structural element at desired orientation using tamping roller to avoid any air voids etc. repeat the same procedure for multiple layer with the interval of 8 hrs. Sand pasting:Applying second coat of saturant after min. 12 hrs, rectify air voids if any paste the river sand on it to make surface rough to takefurther finishes and plastering the surface after complete curing using cement: sandmortar 1:5 - 12 mm Mode of measurement: Per sq mt of glass fiber sheet consumed and not surface area) |
| 14 | Demolishing cement concrete manually/ by mechanical means including disposal of material within 50 metres lead as per direction of Engineer - in - charge Nominal concrete 1:4:8 or leaner mix (i/c equivalent design mix) |
| 15 | Dismantling manually/ by mechanical means including stacking ofserviceable material and disposal of unserviceable material within50 metres lead as per direction of Engineer-in-charge : Water bound macadam road |
| 16 | Earth work in excavation by mechanical means (Hydraulic excavator) /manual means over areas (exceeding 30cm in depth. 1.5 m in width aswell as 10 sqm on plan) including disposal of excavated earth, lead upto 50m and lift upto 1.5m, disposed earth to be levelled and neatly dressed. Deduct for disposed soil not levelled and neatly dressed. |
| 17 | Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundations etc. in layers not exceeding 20cm in depth,consolidating each deposited layer by ramming and watering, lead up to 50 m and lift upto 1.5 m. |
| 18 | P/L cement concrete - all works upto plinth level :1:4:8 (1 Cement : 4 coarse sand : 8 graded stone aggregate 40 mm nominal size) |
| 19 | Providing and laying in position specified grade of reinforced cement concrete, excluding the cost of centering, shuttering, finishing and reinforcement -All work up to plinth level :1:1:2 (1 cement : 1 coarse sand : 2 graded stone aggregate 20 mm nominal |
| 20 | Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level.Thermo-Mechanically Treated bars |
| 21 | Waste/ Rubbish disposal: Carriage of lime, moorum, building rubbish by mechanical transportincludingloading, unloading and stacking of material upto 3 km. |
| 22 | Filling Using broken hard stone of specified nominal size, brought from borrow areas arranged by the Contractor in layers as specified below, for all leads and all lifts, filling, dressing, testing, with all labour, material, equipment, handing, transportationetc. for all types of works at all levels, allcomplete , as per specification, drawings and instructions of the engineer. Size 63mm to 45mm graded hard stone aggregate as per IRC Specification for road and bridge, watering, and compaction each layer to minimum 85% origional volume of stone stack including filling the inersection of stone aggregate with sand. |
| 23 | Installation of M20 Anchor Rods with HILTI RE 500 minimum depth 250 mm |
