1 – General
1.01 Scope (Description of Work)
- The work consists of providing all labor, material and equipment necessary to restore the friction coefficient of the surface pavement using high-pressure water jets.
- Surface renewal will be accomplished by removing 100% of the rubber deposits and other materials (i.e. oil, fuel, and deicing agents) from the pavement’s micro-texture.
- 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 surface renewal or paint or 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 surface renewal 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 surface renewal 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 truck shall have a hydrostatic drive, independent of the truck transmission, capable of infinitely varying the forward speed of the truck during surface renewal from 0 to 7 mph.
- A vacuum truck, vacuum sweeper or similar device capable of collecting the rubber, water and other debris from the runway following surface renewal. The vacuum equipment shall be a self-contained vehicle licensed to travel on the public roadway and capable of traveling at highway speeds.
- The UHP pump shall be capable of delivering a minimum of 16 gpm while operating at 36,000 psi.
- The surface renewal 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 equipment shall be capable of removing a minimum of 5,000 square feet per hour.
- The vehicle shall be capable of carrying sufficient water to operate continuously for a minimum of four hours.
- The equipment shall be equipped with approved flashing yellow safety lights.
- The equipment 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 100% of the rubber deposits and other materials from the pavement surface micro-texture using ultra-high pressure water jets.
- 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.
- Surface renewal may be performed during inclement weather provided the rubber, water, and debris is contained by the vacuum system.
- 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 in an approved landfill.
- The work shall be performed without causing damage to the light fixtures or other airfield property. Damage may occur to the joints and joint sealant material.
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 500 square feet to demonstrate the quality of the surface renewal. The UHP pump shall be set at its operating pressure and flow rate and the forward speed of the vehicle adjusted to remove 100% of the rubber deposits and other materials.
- The test area shall include joints, joint sealing material, lights and other items that may be damaged during surface renewal. Following the test removal the engineer shall inspect the removal operation to determine if any damage has occurred. The engineer shall determine if the results are acceptable and may at his sole discretion terminate the work if damage has occurred.
B. Visual Inspection
The engineer shall determine by visual inspection if 100% 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 100% of the surface and removed all the rubber and other materials from that surface and the pavement micro-texture.
C. Friction Measurements
- Friction measurements maybe made by the engineer before and after the surface renewal. 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 surface renewal and pavement shall not be less then .05 the friction results obtained from the uncontaminated pavement surface. If the uncontaminated surface is 1.00 then the cleaned surface shall be greater then 0.95.
6 – METHOD OF PAYMENT
The unit of measurement shall be a square unit of surface renewal and accepted by the engineer.
Payment shall be made at the bid unit price for “Surface Renewal”.
Surface Renewal Using High-Pressure Water ________Sq. Uts.; ________$/Sq. Ut.; $________