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This paper describes the study of two proposed methods for testing asphalt mixtures to examine their rheological properties, and to estimate those of the contained asphalt binders, without the operation of binder recovery. One is a method for testing softening point of asphalt mixtures which has been correlated to the ring and ball method for asphalt binders. The other is a method for testing brittle point of asphalt mixtures which is comparable the Fraass method for asphalt cement binders. Specimens of the asphalt mixtures tested by the methods are small and thin so that they are convenient for testing asphalt mixtures from existing pavements. The softening point and brittle point of an asphalt mixture can serve to predict the rheological properties of its recovered asphalt. Also, the deflection at the softening point and the stress at the brittle point describe the ductility and the strength respectively of the asphalt mixture.
asphalt mixture, test method, softening point, brittle point, rheological properties, recovered asphalt, penetration, penetration index, mixture stiffness, deflection
Professor, Osaka City University, Osaka,