Water Blasting

Road Marking Removal Specification using Ultra High Pressure Water Jetting

Part 1 - General

• 1) Description of Work: The work consists of providing all labour, traffic control, material and equipment necessary to remove 100% of the existing road markings from concrete, asphalt, tarmacadam and surface dressed roads as indicated on the drawings and in these specifications without damage to the surface using high-pressure water jets.

Part 2 - Materials

• 1) Water shall be potable water obtained from a fire hydrant, municipal source or well. Lake or river water will not be allowed.
• 2) The use of chemicals, abrasive materials, grinders, detergents or salt water will not be allowed.

Part 3  - Equipment

• 1) Road Marking removal shall be performed with engineer approved ultra-high pressure water jetting equipment capable of removing 100% of the existing road marking. The equipment shall be capable of operating at a minimum of 35,000-psi water pressure with flow rates not exceeding 30 litres per minute. The equipment used for the road marking removal shall be a self-propelled vehicle for long lines with all functions programmable and repeatable. The removal head shall be a minimum of 200mm wide and contain a minimum of 16 nozzles. The removal head must be capable of rotating at a minimum of 1,500 rpm. The equipment shall be capable of removing a minimum of 300 square metres per 8-hour shift.
• 2) The removal shall leave the surface clean and ready to accept a new road marking if required.
• 3) Trolley mounted water jetting equipment shall be used to remove road markings in areas inaccessible to the truck mounted equipment such as hatched areas, letters, arrows and symbols. This equipment shall operate at a minimum of 35,000 psi and shall use a minimum of 16 nozzles. The nozzles shall rotate at a minimum of 1,500 rpm.
• 4) All equipment shall be operated to remove road marking in the same direction as the traffic flow.

Part 4 - Execution

• 1) The work shall be performed at the locations designated on the plans or as directed by the engineer.
• 2) Remove 100% of the road marking deposits using ultra-high pressure water jets without damaging the road surface.
• 3) Do not perform work unless the temperature is a minimum of 5ºC and rising and the pavement temperature is a minimum of 0ºC and rising.
• 4) Road marking removal may be performed during inclement weather conditions.
• 5) Any damage to the pavement surface caused by the contractor’s operation shall be repaired at the contractor’s expense. Prior to performing the repair, the engineer shall approve repair methods and procedures.

Part 5 - Quality Control

A. Test Area

• 1) Prior to the start of the work the Contractor shall perform a test removal at a location designated by the engineer of a minimum of 50 square metres to demonstrate the quality of the road marking removal. The UHP pump shall be set at optimal operating pressure and flow rate and the forward speed of the vehicle adjusted to remove 100% of the road marking deposits.

B. Visual Inspection

• 1) The engineer shall determine by visual inspection if 100% of the road marking deposits have been removed.
• 2) Visual inspection shall include a close inspection of the pavement surface to determine if the water jet has contacted a minimum of 100% of the surface and removed the road marking from that surface.

Part 6 - Method of Payment

A. Measurement

• 1) The unit of measurement shall be a square unit of road marking removed and accepted by the engineer.

B. Payment

• 1) Payment shall be made at the bill of quantity unit price for “Road Marking Removal”.
  Pay Item:
  Road Marking Removal Using High-Pressure Water ________€/m²