Perfect-Bond Concrete Overlay MethodSurface treatment using water-ND Waterjet System


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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.
Perfect-Bond Concrete Overlay Method

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.

Perfect-Bond Concrete Overlay Method
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).

Perfect-Bond Concrete Overlay Method



Ameni-Phalt S series
Low noise / Drainage Pavement
Asphalt Mastic
Underground Water Retaining Wall
Asphalt Revetment
Pavement of Dike Sloping
Automobile Proving Grounds/Bicycle Race Courses
Pavement of Straight and Curving Slopes-Lateral paving method


Deep Stabilization
Improvement of Weak Sub-grade


Foamed Mastic Seal(FMS)
Hot-mix Surface Treatment
Foamed Stabilization
Mixed- On-Site Stabilization with Straight Asphalt


Hard Guss Asphalt
Guss Asphalt Pavement


Interlocking Block Pavement
Irregular-shaped Pavement


Mini Road
Instant Paving Material


ND-IT Construction System
ICT (Information Communication Technology) Construction System


Loose Lay Installation/Sand Fill System


Perfect-Bond Concrete Overlay Method
Surface treatment using water-ND Waterjet System
Permeable Color Pavement
Hot-mix Pavement
Pavement Resistant to Heat and Very Heavy Load of Multi-wheeled vehicles


Rainbow Brick
Varied Shape Color Tile Method
Rainbow Color Pavement
Kao Mat SK
Rainbow Color Pavement
Rainbow Color A
Rainbow Color Pavement
Rainbow Color E
Rainbow Color Pavement
Rainbow Color MH
Roller Compacted Concrete Pavement
Recycle Stabilization
On-Site Recycling of Existing Pavement
Recycled Surface
On-Site Surface of Asphalt Pavement
Refresh Seal Mix
Hot Asphalt Surface Treatment Method
Refresh Seal Mix-H
Hot Asphalt Surface Treatment Method (Hard Type)
Road Planing
Cold Planing
Road Stabilization
Improvement of Base Course and Sub-grade
Rolled Asphalt
Pavement Resistant to Abrasion and Skidding


Safety Grooving
Grooving for Skid-resistance
Semi Hot Pave
Warm Mix Asphalt
Pre-cast Low μ Road
Soft Step A
Acrylic Resin Type
Soft Step Grainr
Urethane Rubber Chip N and R Type
Soft Step Grainr
Urethane Rubber Chip P Type
Soft Step Master
Urethane Solid Type
Soft Step Pro
Soft Acrylic Resin Type
Sprinkling Nozzle for Proving Ground
Steel-Fiber-Reinforced Concrete(SFRC)
Steel-Fiber-Reinforced Concrete Pavement
Stone Mastic Asphalt
Abrasion-and-Flow Resistant Pavement

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