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• W630034923 abstract "The direct measurement of binder properties through repeated loading tests is getting more and more attention as a possible performance indicator for mix fatigue behavior. It appears that tests on binders could be a good tool to investigate the effect of binder nature on fatigue behavior of mixes, evaluated in laboratory tests. Until now the relation between binder and mix fatigue behavior is not fully established. The main objective of this paper is to evaluate if binder fatigue behavior can be used as a performance indicator for mix fatigue behavior assessed in laboratory. A second objective is to evaluate the suitability of the dynamic shear rheometer (DSR) to measure binder fatigue properties. Several projects dealing with the relation between binder and mix fatigue behavior are reviewed in this paper. In a first project, the fatigue behavior is investigated at equi-stiffness levels, in binder as well as in mix testing. In a second project binder and mix fatigue behavior are studied at equi-temperature, and finally one sample is investigated over an extended range of temperatures (between 10 and 30 degrees C). All mix fatigue properties are investigated in a 2-point bending test, and one mix composition is used throughout all the projects. For all mixes investigated the fatigue failure is of the cohesive type, taking place in the binder (or mastic) part and not at the interface between aggregate and binder. The review shows that with a DSR, binder fatigue behavior can only be evaluated correctly within narrow stiffness limits. The stiffness level obtained in the fatigue test needs to be high enough, typically above 60MPa, to have a correct measure of the fatigue behavior. At lower stiffness levels, other effects, flow and edge fracture, start to interfere with the fatigue failure and the decrease in stiffness with the number of oscillations becomes gap dependent. On the high stiffness side, typically above 200MPa, the use of most commercial shear rheometers using plate-plate geometry is limited because of compliance errors, which also results in a gap dependent behavior. If binders are compared within the stiffness limits, where binder fatigue is gap independent, good relations between binder and mix-beam fatigue failure are obtained, for the unmodified binders studied in these projects. Since, in this study, the two polymer modified binders were investigated at stiffness conditions where flow has been interfering in the test, it is not possible to draw firm conclusions about the predictive power of binder fatigue tests for polymer modified binders. For the covering abstract see ITRD E121480." @default.
• W630034923 created "2016-06-24" @default.
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• W630034923 date "2004-01-01" @default.
• W630034923 modified "2023-09-23" @default.
• W630034923 title "PREDICT MIX FATIGUE TESTS FROM BINDER FATIGUE PROPERTIES, MEASURED WITH A DSR" @default.
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