1.1 This test method covers the determination of fracture energy (Gf) of asphalt gradient mixtures using the compact tension geometry. The fracture energy can be utilized as a parameter to describe the fracture resistance of asphalt concrete. The fracture energy using the compact tension geometry can be utilized to test asphalt mixtures. In addition, it may be used to determine the fracture energy of an asphalt gradient mixture. An asphalt gradient mixture in the field may be created by the application of a heavy tack coat material under an asphalt mixture. The sprayed asphalt binder creates higher asphalt content at the interface between the new overlay and the existing pavement. 1.2 The specimen may be in the form of field cores or may be laboratory prepared using the Superpave gyratory compactor and a method for preparing composite specimen. 1.3 The test method describes the testing apparatus, instrumentation, specimen fabrication, and analysis procedures required to determine fracture energy of asphalt concrete and similar quasi-brittle materials. 1.4 The standard unit of measurement for fracture energy is Joules/meter2 (J/m2).
This standard will be used by researchers to better understand cracking and fracture energy for asphalt mixtures. It is needed for the ability to test field cores of composite pavements as well as laboratory prepared composite samples. This test will be used by pavement researchers, industry and government agencies that have the test equipment and specimen preparation capabilities for advanced materials characterization.
Keywordsasphalt concrete; crack growth; cracking; crack mouth opening displacement; compact tension; fracture:energy; test geometry; composite pavement
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development