Article 1 — Description
Use u ltra-high-pressure (UHP) w ater cutting treatment equipment to remove excess asphalt to improve the pavement surface texture.
Article 2 — Materials
Furnish water free of industrial wastes, oils, acids, organic matter, or other objectionable matter. Lake or river water will not be allowed. Do not use chemicals, abrasive materials, grinders, detergent s, or salt water. Supply all permits, equipment , and tools necessary to obtain the water.
Article 3 — Equipment
3.1 Ultra -High -Pressure Water Cutting Equipment . Furnish equipment using UHP water to score and remove
asphalt material from the pavement surface. Restore the macrotexture of the pavement surface without any damage to the pavement surface. Provide continuous and uniform production using UHP water cutting equipment with the following capabilities: UHP pump capable of delivering a minimum of 16 gpm while operating at 36,000 psi ; multi- jet spray head capable of rotating at 2,000 rpm with a minimum width of 18- in. vacuum system connected directly to the multi -jet spray head capable of removing asphalt binder, granular debris , and water from the treated pavement surface, and discharging to a waste storage system of sufficient capacity; storage capacity to hold a sufficient amount of water to operate continuously for a minimum of 4 hr.; independent drive, separate from the truck transmission, capable of infinitely varying the forward speed of the truck from 0–7 mph during surface treatment; drive system capable of maintaining forward ground speed within 0.1 mph of pre- set target speed, over roadway slopes of ±3.0% grade; capable of adjustment to vehicle speed, spray bar rotation speed, vacuum system pressure, and waste material removal, on the go, as needed to maintain the quality of the treatment process; capable of treating a minimum of 550 sq. yd. per hour; and instrumentation gauges visible to the operator at all times.
3.1.1 Calibration and Monitoring. The UHP water cutting equipment will be equipped with instrumentation to
facilitate calibration, monitor treatment effectiveness, and capture treatment production data. Gauge readings will be benchmarked to time (daily work shift), and capable of continuous measurement and recording as follows : forward ground speed, certified reliable to 0.1 mph within a range of 0.1– 7.0 mph; and spray bar rotational speed, certified reliable to 10 rpm within a range of 100– 2,000 rpm. UHP pump system pressure, measured as follows: at the pump, certified reliable to 100 psi within a range of 5,000– 50,000 psi; at the spray head, certified reliable to 100 psi within a range of 5,000– 50,000 psi; 221 pavement temperature, measured in front of the cutting head, certified reliable to 1°F within a range of 0–165°F; water storage tank level, certified reliable to 100 gal. over the full tank capacity range; and UHP pump usage, in hours, certified reliable to 0.1 hr.
3.2 Routine Equipment Maintenance . Maintain an inventory of common wear parts and replacement
accessories for equipment to ensure routine maintenance tasks can be performed without delay to the project schedule.
3.3 Operat or. Operate UHP water cutting equipment using personnel who are qualified through training and
experience, including all safety aspects. Provide an operator certification from the equipment manufacturer or equivalent.
3.4 Cleaning . Use equipment for surface cleaning operations where applicable, in accordance with Item 738,
“Cleaning and Sweeping Highways.” Use other cleaning equipment required in accordance with this Item.
Article 4 — Construction
Use U HP water cutting equipment to remove excess asphalt from the pavement surface. Haul and dispose of removed material in conformance with applicable federal, state, and local regulations. If requested, provide an appropriate level of documentation to verify proper disposal . Obtain approval for the sequence of work and the estimated daily production. Operate the UHP water cutting equipment when the air temperature is at least 35° F and rising and less than 85°F, unless otherwise directed. Suspend operations when the Engineer determines that weather conditions are unsuitable. Operate equipment in conformance with the manufacturer’s instructions, including all safety guidelines. Remove excess asphalt from the lane in the direction of travel, unless otherwise directed. Ensure the spray head is not directly in line with and followed by the vehicle tires. Maintain continuous visibility of the treatment area adjacent to and behind the cutting head for the operator or observer with sufficient detail to facilitate identification of any treatment anomalies. Do not damage the pavement surface. Damage consists of but is not limited to raveling or localized removal of the wearing course that exposes the underlying base or pavement layer. Do not damage existing delineation features , such as pavement striping or raised pavement markers. Suspend work when the pavement is damaged, unless otherwise directed. Repair damage to the pavement surface or delineation features caused by the treatment operation, as directed, at the C ontractor’s expense.
4.1 Control Strip. Before treatment operations of each location, the Engineer will select an area with a minimum
length of 100 ft. and a width of the cutter head. The Engineer will select a test location within the control strip area and measure the macrotexture in each wheel path before and after treatment at that same test location in accordance with Section 295.4.2., “Macrotexture.” Demonstrate that the equipment, personnel, and methods of operation can produc e satisfactory treatment results. Determine the target settings for the pump operating pressure and flow rate, nozzle configuration, spray bar rotational speed, and vacuum system pressure to achieve optimal treatment of the flushed pavement surface. Determine the target production rate of the combined operation measured in square yards per hour, based on the control strip treatment equipment settings. The Engineer will visually inspect the control strip area after treatment to confirm no damage to the treated pavement has occurred. When the macrotexture requirements in Section 295. 4.2., “Macrotexture,” ar e met and no damage has occurred as determined by the Engineer, proceed to treat the remaining location.
4.2 Macrotexture. The Engineer will measure the texture depth by the sand patch method in accordance with
Tex-436-A . Measurements will be taken in both wheel paths at the same location after treatment at a 222 minimum frequency of one for every 7,500 sq. yd., in addition to the control strip. Alternatively, the Engineer may use a circular track meter to measure an average texture depth in accordance with ASTM E2157. When m easured in accordance with Tex -436-A , the texture depth must be greater than 0.035 in. When measured using a circular track m eter, the texture depth must be greater than 0.55 in. The Engineer may reduce the testing frequency when two consecutive tests meet the minimum requirement. When these requirements are not met, repeat treatment of any deficient locations as directed. The Engineer will determine the extent of the area in need of additional treatment to correct deficient locations. Remove and replace the UHP water cutting equipment from the project when it does not treat the pavement to achieve acceptable macrotexture results, causes damage to the pavement, or cannot maintain the established production rates, as directed. No additional time will be allowed for failure to bring the proper equipment to the project. When additional or new equipment is used on the project, construct a control strip in accordance with Section 295.4.1., “Control Strip.” Remove debris from the pavement surface when the vacuum system does not adequately remove the debris from the treatment using a broom, shovel, hand scraper, or any other applicable tools and equipment.
Article 5 — Measurement
“UHP Water Cutting Treatment” will be measured by the square yard of completed and accepted work. Measurement will be based on the limits shown on the plans, regardless of the number of passes required.
Article 6 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “ Ultra -High-Pressure Water Cutting Treatment. ” This price is full compensation for treatment of the pavement; UHP water cutting, vacuuming, hauling, and disposing of material; debris removal ; sweeping; and equipment, labor, tools , and incidentals. Demonstration work to receive approval for use of equipment will not be paid for unless work is performed in accordance with the Contract and is accepted. 300 Items Surface Courses and Pavement s This page intentionally left blank