Fumihiro TSUKAMOTO
An Evaluation Method of Mechanical Properties of the Polymer Modified Asphalt
Teruhiko MARUYAMA
The relationship between the durability of modified asphalt mixtures and the mechanical properties of polymer modified asphalt binders was investigated. The durability of asphalt mixtures was evaluated from the fracture energy, which was determined by calculating the total area under the stress-strain curve from the indirect tensile strength test at 15C. On the other hand, tensile fracture energy of the asphalt binders was characterized from load-deformation properties by force ductility testing at the same temperature. Straight asphalt Pen 60/80, polymer modified asphalt type 2, and asphalt rubber were used for the force ductility tests, and the modified dense graded asphalt mixtures using these binders in OAC were tested under the indirect tensile tests. In order to obtain the aged materials, the compacted specimens of mixtures were stored at the 120C oven for 2 to 6days, and after the execution of the indirect tensile tests, the binder was distilled from these specimens for the force ductility tests. The test results indicated that the fracture energy decreased after the aging, though little influence of the polymer modification to the indirect tensile fracture energy appeared. The implementation of tests at low and high temperature is necessary to confirm the effect of polymer modification.
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