ASTM D6932/D6932M-21 - 1.5.2021
 
Significance and Use

4.1This guide provides information to assist engineers with the design requirements and construction guidelines for paving an open-graded friction course (OGFC) surface layer. An OGFC is primarily used to improve the skid resistance and wear resistance of an asphalt pavement by providing an escape route for surface water beneath a moving wheel load. The asphalt mixture is typically produced with a low amount of fine aggregate particles and high air void content to provide a passageway of interconnected voids for moisture to drain away from the travelway. The film thickness of the asphalt and overall asphalt content are important for better stripping resistance and durability and aging properties.

Note 1:OGFCs may also be placed to reduce the tire-pavement interface noise and may also be placed to reduce the occurrence and severity of reflective cracking.

 
1. Scope

1.1This guide covers the construction of open-graded friction course (OGFC) plant asphalt mixtures. End-use specifications should be adopted to conform to job and user requirements. Where applicable, Specification D3666 should be applied as a minimum for agencies testing and inspecting road and paving materials.

1.2Asphalt OGFCs are placed as the final wearing course for highways and airfields.

1.3The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.4This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 
2. Referenced Documents

D7064-04

Standard Practice for Open-Graded Friction Course (OGFC) Mix Design

TRB NCHRP Synthesis 284

Performance Survey on Open-Graded Friction Course Mixes

NCAT Report No. 2001-01

Design, Construction and Performance of New Generation Open-Graded Friction Courses

FAA-RD-73-197

FAA-RD-74-38

D6390-23

Standard Test Method for Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures

D3666-26

Standard Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials

D5821-13(2025)

Standard Test Method for Determining the Percentage of Fractured Particles in Coarse Aggregate

D4791-19(2023)

Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate

D6114-97e1

Standard Specification for Asphalt-Rubber Binder

D6307-19

Standard Test Method for Asphalt Content of Asphalt Mixture by Ignition Method

D6373-23

Standard Specification for Performance-Graded Asphalt Binder

D3381-09

Standard Specification for Viscosity-Graded Asphalt Cement for Use in Pavement Construction

D75-03

Standard Practice for Sampling Aggregates

D140-01

Standard Practice for Sampling Bituminous Materials

D448-12(2022)

Standard Classification for Sizes of Aggregate for Road and Bridge Construction

D946-09

Standard Specification for Penetration-Graded Asphalt Cement for Use in Pavement Construction

D1461-17(2022)

Standard Test Method for Moisture or Volatile Distillates in Asphalt Mixtures

D2419-22

Standard Test Method for Sand Equivalent Value of Soils and Fine Aggregate

D2995-23

Standard Practice for Estimating Application Rate and Residual Application Rate of Bituminous Distributors

C1252-23

Standard Test Methods for Uncompacted Void Content of Fine Aggregate (as Influenced by Particle Shape, Surface Texture, and Grading)

C136-06

Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

C29/C29M-23

Standard Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate

C88-13

Standard Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

C127-25

Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate

C128-25

Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate

C131-06

Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine