1 – General
- Description of Work: The work consists of providing all labor, material and equipment necessary to remove 95% of the rubber buildup from asphalt and concrete runway surfaces without damage to the pavement surface using high-pressure water jets. The pavement surfaces may be smooth or grooved.
- The work is defined as square unit of removal.
A. At the time of bid submittal:
- References, including name, address and telephone number from at least five airfields for whom the company has performed rubber removal with satisfactory results.
- A description of the quantity and types of equipment the contractor proposes to use for this project.
- Qualification statement of the contractor stating the length of time the company has been performing rubber removal at airfields.
B. After award of contract:
- Contractor’s safety program
- Method of disposal of rubber, debris and water.
2 – Materials
- Water shall be potable water obtained from a fire hydrant, municipal source or well. Lake or river water will not be allowed.
- The use of chemicals, abrasive materials, grinders, detergents or salt water will not be allowed.
3 – Equipment
- The equipment used for the rubber removal shall be a self-contained vehicle licensed to travel on the public roadway and capable of traveling at highway speeds. The vehicle shall contain an ultra-high pressure (UHP) water pump and water tank. The vehicle shall have a hydrostatic drive, independent of the truck transmission, capable of infinitely varying the forward speed of the truck during rubber removal from 0 to 7 mph.
- The vehicle shall have a self-contained vacuum system capable of collecting the rubber, water and other debris from the runway during the rubber removal.
- The UHP pump shall be capable of delivering a minimum of 16 gpm while operating at 36,000 psi.
- The rubber removal vehicle shall have a multi-jet spray head, which is capable of rotating at 2,000 rpm. The spray head shall be 24 inches wide and contain a minimum of 28 nozzles.
- The vehicle shall be capable of removing a minimum of 15,000 square feet per hour.
- The vehicle shall be capable of carrying sufficient water to operate continuously for a minimum of four hours.
- The vehicle shall be equipped with approved flashing yellow safety lights.
- The vehicle shall have sufficient lighting to allow work to be performed at night.
4 – Execution
- The work shall be performed at the locations designated on the plans or as directed by the engineer.
- Remove 95% of the rubber deposits using ultra-high pressure water jets without damaging the pavement surface.
- Do not perform work unless the temperature is a minimum of 40º F and rising and the pavement temperature is a minimum of 35º F and rising.
- Rubber removal may be performed during inclement weather provided the water, rubber and debris is contained by the vacuum system.
- Remove 95% of the rubber from all designated surfaces.
- Water collected by the vacuum system shall be separated from the rubber and other debris and discharged to a location designated by the engineer or placed on the ground at a location designated by the engineer and allowed to evaporate or be absorbed in to the ground. Water shall not be allowed to run in to any lake, river or stream. Rubber and debris collected by the vacuum system shall be properly disposed of in an approved landfill.
- 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.
5 – Quality Control
A. Test Area
- 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 1,000 square feet to demonstrate the quality of the rubber removal. The UHP pump shall be set at optimal operating pressure and flow rate and the forward speed of the vehicle adjusted to remove 95% of the rubber deposits.
- The test area shall include joints, joint sealing material, lights and other items that may be damaged during rubber removal. Following the test removal the engineer shall inspect the removal area to determine if the removal is acceptable or any damage has occurred. The engineer shall determine if the results are acceptable and may at his sole discretion terminate the work.
B. Visual Inspection
- The engineer shall determine by visual inspection if 95% of the rubber deposits have been removed.
- Visual inspection shall include a close inspection of the pavement surface to determine if the water jet has contacted a minimum of 95% of the surface and removed the rubber from that surface.
- Areas without rubber removal exceeding .25 square inch will not be acceptable.
C. The engineer may elect to use the AFCES “Compliance Testing” as follows:
- Compliance with the 95% removal from 100% of the area shall be determined by direct testing within the designated work area.
- A 0.1 square meter (approximately one square foot) section of transparent material inscribed with a grid of 100 equal squares shall be used as a tool for quantitative measurement of the 95% removal. Place the grid pattern on the pavement surface at random locations. Then count the squares, which contain rubber deposits. The number of squares containing rubber deposits shall not exceed five in each of the randomly selected locations.
- Each work area designated for rubber removal shall be divided into at least four equal zones for the purpose of compliance testing. Within each zone, a minimum of seven random locations shall be evaluated. At least 95% of the randomly selected areas within each zone must meet the requirement described in paragraph 5.C.2. Each zone shall be evaluated independently. A zone not meeting the 95% removal requirement shall be recleaned by the Contractor at the Contractor’s expense.
- Deposits of rubber or rubber buildup are defined as any surface deposit that can be removed by scratching the deposit with a flat sharp object (such as a pocket knife) without damaging the pavement surface. Stains are defined as materials in the pavement surface microtexture that cannot be removed without damaging the pavement surface. Stain is generally embedded in the surface of the pavement below the horizontal plane of the surface texture. The Contractor is not responsible for stain removal.
D. Friction Measurement
- Friction measurements maybe made by the engineer before and after the rubber removal. The baseline friction measurement shall be measured on the pavement surface at the edge of the runway that has not been contaminated by rubber deposits or other materials.
- Friction measurements taken following the rubber removal shall not be less then .20 the friction results obtained from the uncontaminated pavement surface. If the uncontaminated surface is 1.00 then the cleaned surface shall be greater then 0.80.
6 – Method of Payment
The unit of measurement shall be a square unit of rubber removed and accepted by the engineer.
Payment shall be made at the bid unit price for “Rubber Removal”.
Rubber Removal Using High-Pressure Water ________Sq. Uts.; ________$/Sq. Ut.; $________