SECTION 402 – HMA FRICTION COURSE
402.01 Description
This Section describes the requirements for constructing open -graded friction courses (OGFC), modified open -graded friction courses (MOGFC) and asphalt-rubber open-graded friction courses (AR-OGFC).
402.02 Materials
402.02.01 Materials
Provide materials as specified: Tack Coat ................................ ................................ ................................ ................................ ................ 902.01.01 Polymer Modified Emulsified Asphalt, Grade CRS-1P ................................ . ..............................................902.01.03 Open-Graded Friction Course ................................ ................................ ................................ ....................... 902.03 Modified Open-Graded Friction Course ................................ ................................ ................................ ........ 902.03 Asphalt-Rubber Open-Graded Friction Course................................ ................................ ............................... 902.07 Use HMA specified for the roadway surface as patching material for HMA pavement repair. Use a commercial type of cold mixture as patching material for filling core holes. The Contractor may use an approved HMA surface course to fill core holes provided the material remains hot enough to compact.
402.02.02 Equipment
Provide equipment as specified: Materials Transfer Vehicle (MTV) ................................ ................................ ................................ .............. 1003.01 HMA Paver................................ ................................ ................................ ................................ ................. 1003.03 HMA Compactor ................................ ................................ ................................ ................................ ........ 1003.05 HMA Plant ................................ ................................ ................................ ................................ ................. 1009.01 HMA Trucks ................................ ................................ ................................ ................................ ............... 1009.02 Asphalt-Rubber Binder Blending Equipment ................................ ................................ ............................... 1009.03 Do not dust truck beds with mineral fillers, fine aggregates, slag dust, or other fine graded material. NOTE: A Spray Paver as specified in 1003.04 may be used in lieu of a HMA Paver.
402.03 Construction
402.03.01 Open-Graded Friction Course and Modified Open-Graded Friction Course
A.Paving Plan. At least 20 days before the start of placing the HMA surface course, submit to the RE for approval a detailed plan of operation as specified in 401.03.07.A.
B.Weather Limitations. Do not place OGFC or MOGFC if it is precipitating. Do not allow trucks to leave the plant when precipitation is imminent. The Contractor may resume operations when the precipitation has stopped and the surface is free of water. Do not pave if the ambient temperature is below 50 °F.
C.Test Strip. Construct a test strip as specified in 401.03.07.C. The Department will not require quality control cores or nuclear density testing.
D.Transportation and Delivery of HMA. Transport and deliver HMA as specified in 401.03.07.D.
E.Spreading and Grading. Apply tack coat 64-22 as specified in 401.03.05.2. When using a spray paver, apply the tack coat as specified in 401.03.05. Place OGFC at a laydown temperature of 225 °F. Place MOGFC at the laydown temperature recommended by the binder manufacturer. Ensure that the OGFC and MOGFC meet the thickness and tolerance requirements specified in Table 902.03.03-1 and Table 902.03.03-2. Spread and grade OGFC and MOGFC as specified in 401.03.07.E. Do not apply polymerized joint adhesive or tack coat to longitudinal joints.
F.Compacting. Immediately after spreading and strike-off, compact friction courses with a minimum of 1 pass of a non-vibratory, 2 axle roller. The RE may direct additional passes to eliminate roller marks. The Contractor may use a vibratory roller if it is operated in static mode. Orient the drive axles of the roller towards the paver during the compaction operation. Operate rollers at a slow, uniform speed not exceeding 2 1/2 miles per hour. If necessary to prevent adhesion of the OGFC or MOGFC to the rollers, keep the wheels moistened with water mixed with very small quantities of detergent. Remove and replace OGFC or MOGFC that becomes loose, broken, or otherwise defective or that shows an excess or deficiency of asphalt binder material. When paving in echelon, keep the rollers for the first lane approximately 6 inches from the unconfined edge adjacent to the second paving operation. After OGFC or MOGFC from the second paver is placed against the uncompacted edge of the mat from the first paver, compact the OGFC or MOGFC on both sides of the joint. Prevent lateral or vertical displacement of the unconfined edge during the compaction operation. Ensure that the edge of the drums of the rollers extends over the free edge of the mat by at least 6 inches. When compacting the butt or wedge joint, while paving the adjacent lane, place the roller on the newly placed HMA and overlap the joint by approximately 6 inches.
G.Opening to Traffic. Open to traffic as specified in 401.03.07.G.
I.Ride Quality Requirements. The Department will evaluate the ride quality of the final riding surface of all constructed pavement on the project as specified in 401.03.07.J.
402.03.02 Asphalt-Rubber Open-Graded Friction Course
A.Paving Plan. At least 20 days before beginning placing the AR -OGFC, submit to the RE for approval a detailed plan of operation as specified in 401.03.07.A.
B.Weather Limitations. If within the 12 hours before paving , the National Weather Service locally forecasts a 50 percent chance or greater of precipitation during the scheduled placement, postpone the placement of AR-OGFC. Do not place AR-OGFC if it is precipitating and do not allow trucks to leave the plant when precipitation is imminent. The Contractor may resume paving operations when the chance of precipitation is less than 50 percent and the surface is dry. Do not pave if the surface temperature of the underlying pavement is below 50 °F.
C.Test Strip. Construct a test strip as specified in 401.03.07.C. The Department will not require quality control cores or nuclear density testing.
D.Transportation and Delivery of AR-OGFC. Transport and deliver AR-OGFC as specified in 401.03.07.D.
E.Spreading and Grading. Apply tack coat 64-22 as specified in 401.03.05.2. When using a spray paver, apply the polymer modified tack coat as specified in 401.03.05. Place AR-OGFC at a laydown temperature between 275 °F and 330 °F maximum. Spread and grade AR-OGFC as specified in 401.03.07.E, except do not apply polymerized joint adhesive or tack coat to longitudinal joints.
F.Compacting. Immediately after spreading and strike -off, compact AR -OGFC with a minimum of 1 pass of a non-vibratory, 2 axle roller. The RE may direct additional passes to eliminate roller marks. The Contractor may use a vibratory roller if it is operated in static mode. Orient the drive axles of the roller towards the paver during the compaction operation. Operate rollers at a slow, uniform speed not exceeding 2 1/2 miles per hour. If necessary to prevent adhesion of the AR-OGFC to the rollers, keep the wheels moistened with water mixed with small quantities of detergent or fabric softener. Remove and replace AR -OGFC that becomes loose, broken, or otherwise defective or that shows an excess or deficiency of asphalt-rubber binder material. When paving in echelon, keep the rollers for the first lane approximately 6 inches from the unconfined edge adjacent to the second paving operation. After AR-OGFC from the second paver is placed against the uncompacted edge of the mat from the first paver, compact the AR-OGFC on both sides of the joint. Prevent lateral or vertical displacement of the unconfined edge during the compaction operation. Ensure that the edge of the drums of the rollers extends over the free edge of the mat by at least 6 inches. When compacting the butt joint, while paving the adjacent lane, place the roller on the newly placed AR-OGFC and overlap the joint by approximately 6 inches.
G.Curing. Following compaction, spray 1 to 3 applications of lime water (a minimum of 50 pounds of pulverized limestone per 2,000 gallons of water) to prevent material pick -up. Apply lime water in a manner that uniformly covers the entire surface of the paving pass. Prior to applying the lime water, do not allow traffic on the AR-OGFC, including the lime water applicator.
H.Opening to Traffic. Remove loose material from the traveled way, shoulder, and auxiliary lanes before opening to traffic. Before opening AR-OGFC to traffic or construction equipment, ensure that the lime water has been applied, the surface is tack free and the surface temperature is less than 140 °F.
Referenced in this section
Sections that cite this one
HMA Friction Course in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 201–203 of 651. View official source ↗