Package No. SIVASAGAR/MMPNA/R_R/01 Repair and Rehabilitation of1) RCC Bridge located at Ch. 7.160KM Gourisagar Nitaipukhuri Laukhowa (Gourisagar Moran Road)Road (Boliaghat Tiniali -Laukhowa Bridge approach and 2)RCC Bridge located at Ch. 7.951KM G

Amount

RCC Bridge located at Ch. 7.160KM Gourisagar Nitaipukhuri Laukhowa Chiping of deteriorated concrete and removal of all loose & friable materials and fully exposing rusted reinforcement followed by proper cleaning and removing of rusts and other foreign materials using sand blasting/ emery cloths/ wire brush etc.including formwork as directed and specified by the department complete.

Supplying & applying Epoxy based bonding agent Nitobond EP of Fosroc Chemicals or Masterbrace 1414 of BASF/ Rearmbond EBA or equivelent @ .50 Lit Per SQm after totally saturating the cleaned concrete surface with clean water for proper bonding of old and new concrete including formwork as specified and directed by the department complete.

Patching of damaged concrete surface with structural grade polymer modified reinstatetment morter to like Fosroc Renderoc S2/ Rearm cret RMHS or equivalent at a thickness of 10 to 20 mm as per instruction of manufacturer and as approved by the engineer. The prepacked repair morter should have a compressive strength 45 N/Sqmm, Flexture strength 8 N/Sqmm at 28 days.

Repair of joint Grooves with Epoxy Morter Repair of spalled joint groove of contraction joints, longitudinal joints and concrete pavements using epoxy morter or epoxy concrete.

Providing and fixing 16mm dia MS nozzoles in grid of 1m c/c up to the half of the thickness of the concrete structure. A grout slurry of neat cement & chloride free expanding grout cebex 100 of fosroc Chemicals/Mastergrout CPG-1 of Choksey Chemicals/Armgrout additive of Myk arment/ Masterflow 150of BASF or equivelent @ 0.5 % by weight of cement water cement ratio 0.35 to 0.40 and viscosity not more than 1.02 centipoise with grouting pressure till the refusal of injection grout Mastergrout CPG-1. The grouting operation pressure shall be 2kg/Sqcm. Cutting the exposed nozzle after the grouting with a good cutter to make the surface free from the grouting pipes and to seal the gap with plugging compound Masterplug of Choksey Chemicals as per the specification and the direction of the department complete including formwork.

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per Technical specification including subsequent cutting/ removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy.

Sealing of crack/ porous concrete with Epoxy Grout by injection through nipples complete as per clause 2803.1.

Providing and applying Dekguard E2000 or Masterseal 878 of BASF or Rearmcoat anticarb or equivalent a high performance anti carbonation protective coating system over the primed surface using an airless sprey °or rolled at right angle to each other @ coverage 5 Sqm per litre per coat @ 200 micron wft/100 micron DFT with an intercoat period of minimum 12 hour @ 35°C. The coverage per litre for two coat shall be 2.5 Sqm @ 200 micron DFT. The protective coating system should have Co2 diffusion resistance not less than 240 mm equivalent of air thickness and 60cm equivalent of 30N concrete along with water vapour transmission resistance of less than 1m (taywood method) the coating should have static crack accomodation of not less than 2mm (BRE) and adhession greater than 1 N/Sqmm as per BS1881.

Painting on concrete surface (Providing and applying 2 coats of water based cement paint to unplastered concrete surface after cleaning the surface of dirt, dust, oil, grease, efflorescence and applying paint @ of 1 litre for 2 Sq.m. ) For RCC Railing

Non- destructive testing with Utrasonic Pulse Velocity Meter with data storage facility for detection of crack, voids and other imperfection in Reinforced concrete structures and furnishing the findings thereof in proper comprehensible format, complete as directed by the department.

Conducting Concrete Core tests of 75mm diacores, on concrete structure, as per stipulated procedures, for determination the equivalent cube compressive strength, concrete of the structures including preparation and furnishing the report showing the findings thereof in proper comprehensible format, complete as directed by the department.

RCC Bridge located at Ch. 7.951KM Gourisagar Nitaipukhuri Laukhowa Chiping of deteriorated concrete and removal of all loose & friable materials and fully exposing rusted reinforcement followed by proper cleaning and removing of rusts and other foreign materials using sand blasting/ emery cloths/ wire brush etc.including formwork as directed and specified by the department complete.

Supplying & applying Epoxy based bonding agent Nitobond EP of Fosroc Chemicals or Masterbrace 1414 of BASF/ Rearmbond EBA or equivelent @ .50 Lit Per SQm after totally saturating the cleaned concrete surface with clean water for proper bonding of old and new concrete including formwork as specified and directed by the department complete.

Patching of damaged concrete surface with structural grade polymer modified reinstatetment morter to like Fosroc Renderoc S2/ Rearm cret RMHS or equivalent at a thickness of 10 to 20 mm as per instruction of manufacturer and as approved by the engineer. The prepacked repair morter should have a compressive strength 45 N/Sqmm, Flexture strength 8 N/Sqmm at 28 days.

Repair of joint Grooves with Epoxy Morter Repair of spalled joint groove of contraction joints, longitudinal joints and concrete pavements using epoxy morter or epoxy concrete.

Providing and fixing 16mm dia MS nozzoles in grid of 1m c/c up to the half of the thickness of the concrete structure. A grout slurry of neat cement & chloride free expanding grout cebex 100 of fosroc Chemicals/Mastergrout CPG-1 of Choksey Chemicals/Armgrout additive of Myk arment/ Masterflow 150of BASF or equivelent @ 0.5 % by weight of cement water cement ratio 0.35 to 0.40 and viscosity not more than 1.02 centipoise with grouting pressure till the refusal of injection grout Mastergrout CPG-1. The grouting operation pressure shall be 2kg/Sqcm. Cutting the exposed nozzle after the grouting with a good cutter to make the surface free from the grouting pipes and to seal the gap with plugging compound Masterplug of Choksey Chemicals as per the specification and the direction of the department complete including formwork.

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per Technical specification including subsequent cutting/ removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy.

Sealing of crack/ porous concrete with Epoxy Grout by injection through nipples complete as per clause 2803.1.

Providing and applying Dekguard E2000 or Masterseal 878 of BASF or Rearmcoat anticarb or equivalent a high performance anti carbonation protective coating system over the primed surface using an airless sprey °or rolled at right angle to each other @ coverage 5 Sqm per litre per coat @ 200 micron wft/100 micron DFT with an intercoat period of minimum 12 hour @ 35°C. The coverage per litre for two coat shall be 2.5 Sqm @ 200 micron DFT. The protective coating system should have Co2 diffusion resistance not less than 240 mm equivalent of air thickness and 60cm equivalent of 30N concrete along with water vapour transmission resistance of less than 1m (taywood method) the coating should have static crack accomodation of not less than 2mm (BRE) and adhession greater than 1 N/Sqmm as per BS1881.

Painting on concrete surface (Providing and applying 2 coats of water based cement paint to unplastered concrete surface after cleaning the surface of dirt, dust, oil, grease, efflorescence and applying paint @ of 1 litre for 2 Sq.m. ) For RCC Railing

Non- destructive testing with Utrasonic Pulse Velocity Meter with data storage facility for detection of crack, voids and other imperfection in Reinforced concrete structures and furnishing the findings thereof in proper comprehensible format, complete as directed by the department.

Conducting Concrete Core tests of 75mm diacores, on concrete structure, as per stipulated procedures, for determination the equivalent cube compressive strength, concrete of the structures including preparation and furnishing the report showing the findings thereof in proper comprehensible format, complete as directed by the department.

RANJIT BORGOHAIN