Fatigue cracking, due to repeated traffic load, is the most common mode of failure for asphalt pavements. As it is well known this distress is mainly related to the rheological properties of asphalt binder. In order to better understand the influence of binder on fatigue behaviour of mixture, two experimental investigations were carried out. Each study was finalized to evaluate the effects of cyclic loading on the mechanical properties of binder and asphalt mixture. In particular, a first investigation was carried out to study the fatigue properties of traditional and polymer modified binders using a dynamic shear rheometer (DSR). A second experimental investigation was carried out to evaluate the fatigue performance of asphalt mixes for wearing courses, manufactured with the same binders, through repeated loading axial tensile test. The analysis of results allowed to obtain analytic laws, achieved separately for binders and bituminous mixes, showing the decay of the mechanical properties of materials subjected to cyclic loading. Moreover, for each material the influence of the stress level and temperature was evaluated. Finally relationship between the mechanical behaviour of mixtures and binders have been discussed through the comparison of the above mentioned structural distress models in order to estimate the role of binder in fatigue behaviour of asphalt mixtures.
Correlation between binder and bituminous mixture fatigue behaviour
CERNI, Gianluca;
2007
Abstract
Fatigue cracking, due to repeated traffic load, is the most common mode of failure for asphalt pavements. As it is well known this distress is mainly related to the rheological properties of asphalt binder. In order to better understand the influence of binder on fatigue behaviour of mixture, two experimental investigations were carried out. Each study was finalized to evaluate the effects of cyclic loading on the mechanical properties of binder and asphalt mixture. In particular, a first investigation was carried out to study the fatigue properties of traditional and polymer modified binders using a dynamic shear rheometer (DSR). A second experimental investigation was carried out to evaluate the fatigue performance of asphalt mixes for wearing courses, manufactured with the same binders, through repeated loading axial tensile test. The analysis of results allowed to obtain analytic laws, achieved separately for binders and bituminous mixes, showing the decay of the mechanical properties of materials subjected to cyclic loading. Moreover, for each material the influence of the stress level and temperature was evaluated. Finally relationship between the mechanical behaviour of mixtures and binders have been discussed through the comparison of the above mentioned structural distress models in order to estimate the role of binder in fatigue behaviour of asphalt mixtures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
