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- W646738835 abstract "Modified asphalt mixtures are increasingly used in road construction. Appropriate test methods should be available in order to describe the likely behaviour of asphalt mixtures by means of experiments in laboratory. In the late sixties a rheological model for the description of the mechanical behaviour of asphalt specimens considering plastic deformation was developed in our institute. This model was calibrated by extensive static tests on large specimens (height = 300 mm, diameter = 120 mm) in a triaxial cell. By the triaxial cell the supporting effect of the surroundings on a loaded element of the road pavements can be simulated. For further experiments, an electronically regulated testing equipment for dynamic loadings was employed. In this paper the rheological model and the most important previous studies are presented; the triaxial cell and the measuring equipment are only briefly described. Further on, the arguments on the choice of the dimensions and on the preparation procedure of the most appropriate test specimens are discussed. A large part of the paper describes the experiments made on modified asphalt mixtures. Several test methods were applied: (a) dynamic compression tests on Marshall specimens, (b) dynamic uniaxial compression tests and (c) dynamic triaxial compression tests on large specimens. These tests showed the great influence of the test conditions and of the specimen dimensions on the results and pointed out the difficulties of relating the experimental results to practice. The purpose of the paper is to survey the state of the actual studies on modified asphalt mixtures. These investigations aim at the development of a practical relevant dynamic test method that should be economic and feasible in all road construction laboratories.(a) for the covering abstract of the symposium see IRRD 815173." @default.
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- W646738835 date "1985-01-01" @default.
- W646738835 modified "2023-09-23" @default.
- W646738835 title "THE INFLUENCE OF MODIFIED BITUMEN ON THE MECHANICAL BEHAVIOUR OF ASPHALT TEST SPECIMENS --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985" @default.
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