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Japanese Site Search PROFILE OVERSEAS OFFICE DOMESTIC BRANCHES TECHNOLOGY TECHNOLOGY ROADS AIRPORTS BRIDGES TEST COURSES / RACE CIRCUITS MAINTENANCE SPORTS AND LESIURE FACILITIES TECHNICAL RESEARCH INSTITUTE RESEARCH FACILITY ORGANIZATION SCIENTIFIC PAPERS IR ISO CONTACT US Search PROFILE OVERSEAS OFFICE DOMESTIC BRANCHES TECHNOLOGY ROADS AIRPORTS BRIDGES TEST COURSES / RACE CIRCUITS MAINTENANCE SPORTS AND LESIURE FACILITIES TECHNICAL RESEARCH INSTITUTE IR ISO Perfect-Bond Concrete Overlay Method HOME TECHNOLOGY CONSTRUCTION TECHNOLOGY Perfect-Bond Concrete Overlay Method Surface treatment using water-ND Waterjet System Method overview An ultrahigh pressure waterjet at a high flow rate is used to expose aggregate particles in existing concrete to form a rough surface with 10- to 20-mm irregularities. The exposed surfaces are further treated with shotblasting using steel particles cut to special shapes to achieve fine irregularity. This boosts the interlocking strength and bond area between old and new concrete, increases bond strength and completely unifies the layers. This result is a concrete overlay utilizing the strength of existing pavement and having no risk of delamination. The Nippon Road Co., Ltd. developed the ND Waterjet System for surface treatment, a key element of the Perfect-Bond Concrete Overlay Method. Concrete overlay with no risk of delamination Possible delamination of concrete overlay. Bonding of old and new concrete Comparison of bond strengths by representative surface treatment methods The conditions of treated surfaces of old concrete strongly affect the bond strength with new concrete. The bond strengths obtained by representative treatment methods are as shown in the figure. Proof of concrete bond The figure below shows typical bond strength obtained by the Perfect-Bond Concrete Overlay Method. The strength values are equivalent to tensile strength of concrete specimens without joints. The concrete layers are therefore judged as perfectly unified. These values also satisfy the interfacial bond strength specified by this method (not less than 85% of 28-day tensile strength). 1 2 3 4 Next CONSTRUCTION TECHNOLOGY A Ameni-Phalt S seriesLow noise / Drainage Pavement Asphalt MasticUnderground Water Retaining Wall Asphalt RevetmentPavement of Dike Sloping Automobile Proving Grounds/Bicycle Race CoursesPavement of Straight and Curving Slopes-Lateral paving method D Deep StabilizationImprovement of Weak Sub-grade F Foamed Mastic Seal(FMS)Hot-mix Surface Treatment Foamed StabilizationMixed- On-Site Stabilization with Straight Asphalt H Hard Guss AsphaltGuss Asphalt Pavement HIGH SPEED TRACKBANK PAVING SYSTEM I Interlocking Block PavementIrregular-shaped Pavement M Mini RoadInstant Paving Material N ND-IT Construction SystemICT (Information Communication Technology) Construction System O OmnicourtLoose Lay Installation/Sand Fill System P Perfect-Bond Concrete Overlay MethodSurface treatment using water-ND Waterjet System Permeable Color PavementHot-mix Pavement Poliment-UltrapavePavement Resistant to Heat and Very Heavy Load of Multi-wheeled vehicles R Rainbow BrickVaried Shape Color Tile Method Rainbow Color PavementKao Mat SK Rainbow Color PavementRainbow Color A Rainbow Color PavementRainbow Color E Rainbow Color PavementRainbow Color MH R.C.C.P.Roller Compacted Concrete Pavement Recycle StabilizationOn-Site Recycling of Existing Pavement Recycled SurfaceOn-Site Surface of Asphalt Pavement Refresh Seal MixHot Asphalt Surface Treatment Method Refresh Seal Mix-HHot Asphalt Surface Treatment Method (Hard Type) Road PlaningCold Planing Road StabilizationImprovement of Base Course and Sub-grade Rolled AsphaltPavement Resistant to Abrasion and Skidding S Safety GroovingGrooving for Skid-resistance Semi Hot PaveWarm Mix Asphalt SKID-PANELPre-cast Low μ Road Soft Step AAcrylic Resin Type Soft Step GrainrUrethane Rubber Chip N and R Type Soft Step GrainrUrethane Rubber Chip P Type Soft Step MasterUrethane Solid Type Soft Step ProSoft Acrylic Resin Type SPRINKLING NOZZLESprinkling Nozzle for Proving Ground Steel-Fiber-Reinforced Concrete(SFRC)Steel-Fiber-Reinforced Concrete Pavement Stone Mastic AsphaltAbrasion-and-Flow Resistant Pavement Top PROFILE OVERSEAS OFFICE DOMESTIC BRANCHES TECHNOLOGY ROADS AIRPORTS BRIDGES TEST COURSES / RACE CIRCUITS MAINTENANCE SPORTS AND LESIURE FACILITIES TECHNICAL RESEARCH INSTITUTE RESEARCH INSTITUTE ORGANIZATION SCIENTIFIC PAPERS CONSTRUCTION TECHNOLOGY Ameni-Phalt S series Asphalt Mastic Asphalt Revetment Automobile Proving Grounds/Bicycle Race Courses Deep Stabilization Foamed Mastic Seal(FMS) Foamed Stabilization Hard Guss Asphalt HIGH SPEED TRACK Interlocking Block Pavement Mini Road Omnicourt Perfect-Bond Concrete Overlay Method Perfect-Bond Concrete Overlay Method Perfect-Bond Concrete Overlay Method Perfect-Bond Concrete Overlay Method Permeable Color Pavement Poliment-Ultrapave Rainbow Brick Rainbow Color Pavement Rainbow Color Pavement Rainbow Color Pavement Rainbow Color Pavement R.C.C.P. Recycle Stabilization Recycled Surface Road Planing Road Stabilization Rolled Asphalt Safety Grooving SKID-PANEL Soft Step A Soft Step Grainr Soft Step Grainr Soft Step Master Soft Step Pro SPRINKLING NOZZLE Steel-Fiber-Reinforced Concrete(SFRC) Stone Mastic Asphalt ND-IT Construction System Semi Hot Pave Refresh Seal Mix Refresh Seal Mix-H INVESTOR RELATIONS GENERAL MEETING OF SHAREHOLDERS SUMMARIES OF FINANCIAL RESULTS ANNUAL FINANCIAL DATA INTEGRATED REPORT FINANCIAL RESULTS BRIEFING ISO PAGETOP PROFILE OVERSEAS OFFICE DOMESTIC BRANCHES TECHNOLOGY ROADS AIRPORTS BRIDGES TEST COURSES / RACE CIRCUITS MAINTENANCE SPORTS AND LESIURE FACILITIES TECHNICAL RESEARCH INSTITUTE IR ISO Japanese © THE NIPPON ROAD CO., LTD., All Rights Reserved CONTACT US