Work Item
ASTM WK75536
New Specification for Aramid Fiber for Asphalt Mixtures
1. Scope
1.1 This standard specification covers a standardized method whereby an aromatic polyamide fiber to be used in asphalt mixtures can be specified. The aromatic polyamide fiber (shortened, aramid in untreated form) can be specified by physical and mechanical properties, and product form for use in asphalt mixtures. The main goal of adding aramid fiber is to improve the asphalt mixtures mechanical performance. Aramid fiber may provide structural properties to the mixture and thus is different than fibers such as cellulose fibers that are solely used to prevent drain down. The aramid fiber may be coated (i.e. “treated”) with a Fischer Tropsch wax, blended with a Polyolefin Fiber, or some other additive to reduce “fly-away” due to the lightweight aramid fiber. The mechanical properties listed in the standard specification are for the non-treated aramid fiber.
Keywords
aramid fiber; fiber-reinforced asphalt concrete
Rationale
Currently there is not an ASTM standard specification for aromatic polyamide (shortened, aramid) fiber for use in asphalt mixtures. Aramid fiber usage in asphalt mixture applications is growing across North America. A standard specification is needed to ensure that the agency is getting a consistent product. This standard specification will cover the composition, physical properties, and product form for the use of an aramid fiber in asphalt mixtures.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 01-15-2021
Technical Contact: Phillip Blankenship
Item: 001
Ballot: D04 (21-05)
Status: Withdrawn From Balloting
Item: 001
Ballot: D04 (21-03)
Status: Withdrawn From Balloting
Item: 002
Ballot: D04 (22-01)
Status: Will Reballot Item
Item: 005
Ballot: D04 (22-04)
Status: In Balloting