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.”
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.”
405.04 Permeable Friction Course
B.Preparation of Materials Ensure the discharge temperature of the PFC does not exceed 350°F [177°C]. Dispose of dust collected fro m this operation or return it to the mixture as required to meet the job -mix formula. Maintain the aggregate stockpiles in a reasonably dry condition so that drum mixing will drive out all remaining moisture.
C.Mixing Mix the aggregate and bituminous mate rial in accordance with Subsection 411.04.E, “Mixing.”
D.Loading and Hauling Coordinate loading and hauling of the PFC with laydown operations to: Ensure PFC placement within the temperature range in accordance with Subsection 406.04.G., “Spreading and Finishing, ” and Prevent separation of the bituminous material and aggregate in the PFC.
E.Tack Apply a tack coat or NT tack material in accordance with Section 407, “Fog Seal and Tack Coat.”
F.Weather Limitations Place PFC on a dry surface. Ensure the prepared roadbed surface is at least 60 °F [15 °C] measured away from artificial heat sources. Ensure weather conditions allow proper leveling and cons olidation of the PFC.
G.Spreading and Finishing Remove foreign material from the prepared roadbed before placing PFC. Ensure that the temperature of the PFC at the time of placement is 300°F 25°F [149°C 14°C]. Do not windrow the PFC before spreading an d finishing. Place the PFC using a MTV. The Resident Engineer may exempt isolated areas of the project from use of an MTV. Continuously remix the material using one of the following methods: Internally, in the transfer device, In a paver hopper insert, o r In the paver’s hopper. Use remixing augers or paddles capable of continuously blending the PFC. Ensure the MTV, the haul units, and the pavers provide a continuous, uniform, segregation -free flow of material. To avoid stopping and restarting operations, coordinate the following: The number of haul units, The speed of the paver, The plant production rate, and The speed of the MTV. Do not raise (dump) the wings of the paver's receiving hopper during the paving operation. PERMEABLE FRICTION COURSE 405.05 Stop laydown operations until the e quipment is repaired or replaced if an MTV unit malfunctions. Ensure the placed material is free of segregation, inconsistent texture, bleeding, fat spots, and cracking. For MTV units that exceed 20,000 lb [9,000 kg] per axle, adhere to the following guide lines when crossing bridges. If the bridge is in good condition: Empty the MTV hopper, Travel at a crawl speed, and Ensure the MTV wheels are positioned over the underlying bridge beam lines. If the bridge is in poor condition or posted for load limits, a dditional limitations may be necessary. The Resident Engineer will consult the ODOT Bridge Division.
H.Joints Place the longitudinal PFC joint at the lane lines, and offset this joint from the underlying joint by at least 3 in [75 mm]. Ensure the joints are tight, smooth, butt -type joints.
I.Compaction Roll the surface with two or three passes with a non -vibratory steel -wheeled, self -propelled roller immediately after placing PFC material. The Department will not allow pneumatic rollers. Construct a sm ooth finished surface in accordance with Subsection 401.04.A(1), “Surface Elevation and Smoothness, ” and Subsection 401.04.A(2), “Width .” Ensure the finished PFC is at least as thick as the thickness shown on the Plans but no thicker than the thickness shown on the Plans plus ¼ in [6.4 mm]. Remove and replace defective areas immediately, at no additional cost to the Department. Restrict t raffic from the finished PFC pavement until the surface temperature is within 10°F [6°C] of the ambient temperature, or 2 hr after the final rolling.
405.05 Method of Measuremen T
The Resident Engineer will measure the weight of Permeable Friction Course not exceeding the calculated weight obtained by multiplying the unit weight from the job mix formula by the completed length of PFC and the area of the typical cross section shown on the Plans.
406.04 Open -Graded Friction Surface Course
405.06 Basis of Payment
The Department will pay for each pay i tem at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: PERMEABLE FRICTION COURSE Ton [Metric Ton] The Department will pay for tack in accordance with Section 407, “Fog Seal and Tack Coat.” The Department will adjust payment for asphalt binder in accordance with Subsection 411.06.B, “Price Adjustments for Asphalt Binder. ” SECTION 406 OPEN -GRADED FRICTION SURFACE COURSE
406.01 Description
This work consists of mixing aggregate and bituminous material in a central plant, then spreading and compacting the mixed material on a prepared roadbed.
406.02 Materials
Provide materials in accordance with Section 708, “Plant Mix Bituminous Bases and Surfaces.”
406.03 Equipment
Provide equipment in accordance with Subsection 411.03, “Equipment.”
406.04 Construct Ion Methods
A.Stockpiling Materials Stockpile aggregate in accordance with Subsection 106.08, “Storage and Handling of Materials.”
B.Preparation of Materials Dry and heat the aggregate to a temperature no greater than 260 °F [127 °C]. Collect resulting dust, and remove or return it to the mixture required to meet the Job -Mix Formula (JMF). Ensure the aggregate used in the Open -Graded Friction Surface Course (OGFSC) is free of oily or carbonaceous coatings. Ensure the temperature of bituminous material does not exceed 350 °F [177 °C] before and during mixing.
C.Mixing Mix the aggregate and bituminous material in accordance with Subsection 411.04.E, “Mixing.”
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 235–237 of 935.