404.03 Ultra -Thin Bonded Wearing Course
403.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.CHIP SEAL (SINGLE TREATMENT) Square Yard [Square Meter]
B.CHIP SEAL (DOUBLE TREATMENT) Square Yard [Square Meter]
C.PREPARATION OF BASE Linear Foot [Meter] Include the cost of bituminous binder, cover aggregate, and sand or other approved aggregate (for blotting) in the contract unit price for the appropriate chip seal pay item. Include the cost of applying every layer of a double treatment, as required by the Contract, to be included in the contract unit price for Chip Seal (Double Treatment) . The Department will pay for tack coat in accordance with Section 407, “Fog Seal and Tack Coat,” and prime coat in accordance with Section 408, “Prime Coat. ” ULTRA -THIN BONDED WEARING COURSE
404.01 Description
Ultra -thin bonded wearing course (UTBWC) is a mixture of gap -graded aggregate, polymerized Performance Grade binder, that is mixed at an asphalt plant and delivered to the Project and laid over a rapid setting polymer modified emulsion membrane sprayed within seconds of the laying the mixture.
404.02 Materials
Provide materials in accordance with Section 707, “Thin Surface Courses.”
404.03 Equipment
A.General Provide mixing plants, scales, and material transfer vehicle in accordance with Section 411.03.
B.Pavers Provide a paver approved by the Resident Engineer. Ensure the paver has the following: A receiving hopper for hot mix asphalt; A feed conveyor; An asphalt emulsion storage tank; A system for measuring the Polymer Modified Asphalt Emulsion Membrane volume; A spray bar; and A heated, variable width, vibratory or combination vibratory -tamping bar screed. ULTRA -THIN BONDED WEARING COURSE 404.04 Ensure the paver is capable of the following: Spraying the Polymer Modified Asphalt Emulsion Membrane; Applying the hot mix asphalt overlay; Leveling the surface of the mat in one pass; Placing the hot mix asphalt within 5 seconds after the application of the Polymer Modified Asphalt Emulsion Membrane; and Paving at a controlled speed from 30 ft/min to 90 ft/min [9 m/min to 27 m/min]. Prevent wheels and other parts of the paving machine from contacting the Polymer Modified Emulsion Membrane before applying the hot mix asphalt. Provide a machine with a screed that is capable of crowning the pavement at the center and adjusting the extensions ve rtically to accommodate the pavement profile.
404.04 Construction Methods
Place equipment, loading vehicles, and supply trucks in the lane being paved if constructing under traffic.
A.Weather Limitations Place material when the roadway surface temperature is at least 55 °F [13 °C] with no fog or rain. The Resident Engineer may allow paving on a damp pavement surface with aggregate voids free of standing water and a good weather forecast.
B.Surface Preparation Clear vegetation, loose aggregate, and soil f rom the roadway surface.
1.Application Uniformly spray the Polymer Modified Emulsion Membrane at a temperature from 120 °F to 180 °F [49°C to 82°C] using a metered mechanical pressure spray bar, or as recommended by the material supplier. Ensure the s prayer accurately and continuously monitors the spray rate and applies the membrane uniformly across the width of the overlay. The Resident Engineer may adjust the spray rate based on the pavement surface conditions and the recommendations of the material supplier. Apply the UTBWC at a temperature from 290 °F to 330 °F [143°C to 166°C] over the full width of Polymer Modified Emulsion Membrane immediately after applying the Polymer Modified Emulsion Membrane. Place the UTBWC with a heated vibratory or comb ination vibratory -tamping bar screed. Pave continuously to reduce surface imperfections. Apply UTBWC at the target rate shown on the Plans, or as determined by the Resident Engineer, to minimize fractures in the top size aggregate in the finished pavement surface and at the paving edges for tapering.
2.Compaction Immediately after placing the UTBWC, compact in two to three passes with approved steel, double -drum asphalt rollers (in non -vibratory mode) of at least 10 ton [9 metric ton]. Use enough 404. 05 ULTRA -THIN BONDED WEARING COURSE roller units to finish compacting before the material temperature falls below 195 °F [91 °C]. Do not stop the rollers on the freshly placed UTBWC, until the mat temperature falls below 180 °F [82 °C]. Equip rollers with a water system and scrapers to prevent t he fresh mix from adhering to the roller drums. If a water system is not sufficient, add a release agent approved by the Resident Engineer. To prevent aggregate degradation, avoid excessively rolling UTBWC in the driving lanes. The Resident Engineer wil l determine the acceptable extent of fracturing at the edge of the pavement due to rolling operations. Do not allow traffic on the new pavement until the rolling operation is complete and the material temperature is below 160 °F [71°C]. Ensure the compact ed thickness of the finished UTBWC is at least ½ in [13 mm] for Type A, ⅝ in [16 mm] for Type B, and ¾ in [19 mm] for Type C.
3.Acceptance A lot consists of one day’s run, or a maximum of 500 ton [500 metric ton]. The Resident Engineer will perform the following tasks: Take the first sample after the hot mix plant start -up from the third, fourth, or fifth production truck loads; Sample the mixture at the hot mix plant from the transport truck; Randomly select the sample locations within each lot, Verify the daily application rate of the Polymer Modified Emulsion Membrane by dividing the volume used by the area paved each day; Test asphalt content in accordance with OHD L-26; and Test aggregate gradation in accordance with AASHTO T 30. Stop production if the running average of three consecutive gradation and asphalt content test results varies from the Job -Mix Formula (JMF) by more than the quality control tolerances specified in Subsection 707.03, “Tolerances” as direc ted by the Resident Engineer. Identify the cause of the discrepancies, adjust the JMF, and document the corrective actions. If the adjusted JMF meets the mixture requirements of the Contract and the Resident Engineer approves, replace the current JMF with the adjusted JMF and continue production. Remove defective areas if directed by the Resident Engineer and replace with acceptable material at no additional cost to the Department.
404.05 Method of Measuremen T
The Resident Engineer will include the aggregate, polymerized performance grade binder, mineral fillers, and other ingredients as specified in the JMF in the measurement for the relevant UTBWC pay items. The Resident Engineer will not include the weight of Polymer Modified Emulsified Membrane in the measurement of the relevant UTBWC pay items. PERMEABLE FRICTION COURSE 405.04
404.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.ULTRA -THIN BONDED WEARING COURSE, TY PE A Ton [Metric Ton]
B.ULTRA -THIN BONDED WEARING COURSE, TYPE B Ton [Metric Ton]
C.ULTRA -THIN BONDED WEARING COURSE, TYPE C Ton [Metric Ton] Include the cost of Polymer Modified Emulsified Membrane in the contract unit price for the relevant UTBWC pay items. The Department will adjust payment for asphalt binder in accordance with Subsection 411.06.B, “Price Adjustments for Asphalt Binder.” SECTION 405 PERMEABLE FRICTION COURSE
405.01 Description
This work consists of mixing aggregate, bituminous material, and fibers in a central plant, then spreading and compacting the mixed material on a prepared roadbed.
405.02 Materials
Provide materials in accordance with Section 708, “Plant Mix Bituminous Bases and Surfaces.”
405.03 Equipment
Provide equipment in accordance with Subsection 411.03, “Equipment.” Use a Material Transfer Vehicle (MTV) to place Perm eable Friction Course (PFC). Provide a fiber supply system to distribute uniformly the specified proportions of fiber into the PFC. Ensure the fiber supply system has the following characteristics: Low level and no -flow indicators; A printout or data file that records the feed rate; and A section of transparent pipe that allows observation of flow and feed consistency. The Resident Engineer will review and approve mineral filler feeder systems.
405.04 Construction Methods
A.Stockpiling Materials Stockpile aggregates in accordance with Subsection 106.8, “Storage and Handling of Materials.”
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 232–234 of 935.