Update: Asphalt Concrete Fatigue Failure
Many factors, such as traffic, drainage, structure and climatic variations, impact the field performance of asphalt concrete. However, asphalt concrete performance has been more accurately predicted when laboratory material properties are known, so ASTM International Committee D04 on Road and Paving Materials has approved a new standard, D7460, Test Method for Determining Fatigue Failure of Compacted Asphalt Concrete Subjected to Repeated Flexural Bending. Under the jurisdiction of Subcommittee D04.26 on Fundamental/Mechanistic Tests, D7460 includes information that can be used to judge the variation of fatigue testing results and will provide testing laboratories a better method for determining failure point.
Richard W. May, consultant and D04 member, says that the new standard is the best and most appropriate material testing approach for estimating the longitudinal fatigue cracking performance of an asphalt concrete mixture, subjected to the tensile strain levels experienced in a specific pavement cross-section. May notes that interested parties are invited to participate the subcommittee’s activities, including future D7460 round robin testing.
Technical Information: Richard W. May, Wichita, Kan.
ASTM Staff: Daniel Smith
Source: ASTM Int'l.
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