SECTION 402 — FRICTION COURSE — FRICTION COURSE
402.01 Description.
Produce and place Friction Course according to SECTION 401 with the following exceptions and qualifications.
402.02 Materials.
Ensure that all materials comply with SECTION 401 with the following qualifications. Performance Graded Binder. Use a binder that complies with PG 64E-28 as specified in SECTION 401. If the friction course is specified as “for Shoulders,” use a binder that complies with PG 64S -28 as specified in SECTION 401. Mix Design. Provide a mix design that is a 50- blow Marshall mix meeting the requirements of the Asphalt Institute Publication MS-2 and SECTION 401 with the following exceptions: The Gradation and Asphalt Content Master Range is: Sieve Size Percent Passing ¾ in. 100 ½ in. 95 – 100 ⅜ in. 70 – 100 #4 25 – 45 #8 20 – 35 #30 8 – 15 #50 5 – 12 #200 2 – 6 % AC 6.0 – 7.0 Notes: • Marshall Stability: 750 Minimum • Percent Voids: 5 Minimum • Flow: 8 – 16 Quality Assurance. Quality assurance procedures will conform to SECTION 401 with the following exceptions:
a.Acceptance Testing. ● Binder content will be as determined in SECTION 401. Marshall stability, flow, and voids will not be used for acceptance.
Part 400 — Asphalt Pavements August 2025
SECTION 402 — FRICTION COURSE 400-19
b.Plant Pay Adjustments. ● Pay adjustments for deviation from the optimum binder content (as established by the mix design) will be as determined in SECTION 401. No other pay adjustments for material properties will be assessed . For pay adjustments to apply, a minimum of 5000 tons must be placed. ● The Tables in Subsection 401.02.4, paragraph b.4 will be used for pay adjustments. Ensure that all other tolerances conform to SECTION 401.
c.Compaction. ● Use Intelligent Compaction for HMA when the quantity of friction course on the Project is greater than 5000 tons. ● When friction course is placed on bridge decks, use an oscillatory roller in oscillatory mode.
402.03 Construction.
Placement. Placement will be as in Subsection 401.03 with the following exceptions. Produce the HMA at 300°F ±20°F. Use a material transfer vehicle (MTV) for the placement of friction course and the underlying layer in all travel lanes. Operate the MTV from an adjacent lane unless the Engineer approves its use in the same lane as the paver. The use and operation of a MTV may be waived with justification as approved by the Engineer. If unforeseen circumstances cause the paving operation to cease, provide a minimum of three loaded trucks on site before paving will be allowed to resume. After placement, uniformly compact the mixture with powered vibratory or oscillatory steel drum rollers. If more than 500 tons of daily placement, operate a minimum of three rollers to handle the output of the plant. If less than 500 tons, operate a minimum of two rollers to handle the output of the plant. Operate rollers in vibratory mode on pavements and oscillatory mode on bridge decks. Each lane may be paved so that a longitudinal drop- off remains until the next paving session. Proceed with each subsequent paving operation adjacent to the previous. Use a 12-in. notched wedge joint maker on all drop-offs, regardless of whether they are on the left, right, or both sides of the pavement. Spray notched wedge joints with tack coat at a rate of between 0.12 and 0.14 gal/sq yd. Manually brush transverse joints with tack coat. Ensure that t ransverse drop offs at the end of a paving session comply with Subsection 401.03.11. Use RS-1 or RS-1h tack coat and uniformly apply at a rate of between 0.08 and 0.10 gal/sq yd to the underlying surface to be paved.
Part 400 — Asphalt Pavements August 2025
400-20 SECTION 402 — FRICTION COURSE Weather Limitations. Do not place friction course on a wet or damp surface or when the temperature of the surface to be paved, in the shade, is less than 55°F, measured before placement. Only place friction course when the air temperature, in the shade, is at least 55°F . If a WMA (warm mix additive) is used, ensure that both the air and surface temperature in the shade is 50oF or greater. If, after mobilization, the weather limitations have an impact, assume all costs associated with the stopping, delaying, or canceling of operations.
402.04 Method of Measurement.
The method of measurement is the same as in Subsection 401.04.
402.05 Basis of Payment.
The basis of payment is the same as in Subsection 401.05.
Referenced in this section
Friction Course in other states
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Source: Standard Specifications for Road and Bridge Construction (Blue Book), 2022 (Aug 2025 compilation) Edition. Pages 237–239 of 951. View official source ↗