Abstract
Abstract The addition of polymers on asphalt binders aims to enhance their performance, especially at high temperatures, which correspond to rutting resistance. The Superpave rutting parameter (|G*|/sinδ) has been considered to be inadequate to characterize the performance of modified materials, therefore the Multiple Stress Creep and Recovery (MSCR) test was developed, providing the parameter non-recoverable compliance (Jnr). This research has the main objective of correlating asphalt binders performance-based characterization with rutting resistance of asphalt mixtures, and presents results obtained for one conventional (50/70 penetration grade) and two modified asphalt binders (2.1% RET and 1.9% RET) regarding their rheological characteristics. With the use of the dynamic shear rheometer (DSR), master curves and MSCR results were obtained for the three binders. In addition, permanent deformation tests were performed on the asphalt mixtures by means of laboratory traffic simulation. The rutting characterization indicated higher permanent deformation resistance for the modified binders for the asphalt binder and the asphalt mixture testing. The main conclusions were that the use of modified binder reduced in approximately 50% the Jnr values and the rut depth; also, the asphalt binders’ characteristics were able to predict the asphalt mixtures rutting resistance.
Highlights
The addition of polymers on asphalt binders aims to enhance their performance, especially at high temperatures, which correspond to rutting resistance
The main conclusions were that the use of modified binder reduced in approximately 50% the Jnr values and the rut depth; the asphalt binders’ characteristics were able to predict the asphalt mixtures rutting resistance
Rheological tests were performed on each material using the dynamic shear rheometer (DSR) and asphalt mixtures constituted by these three binders were compacted and tested in terms of rutting resistance on the Laboratoire Central des Ponts et Chaussées (LCPC) wheel-track testing equipment (EN 12697-22, 2003)
Summary
Abstract: The addition of polymers on asphalt binders aims to enhance their performance, especially at high temperatures, which correspond to rutting resistance. For the conventional characterization (AASHTO M 320, 2015), the Superpave parameter |G*|/sinδ should be a minimum value of 2.2 kPa. The other standard considered for PG purposes (AASHTO M 332, 2014) requires maximum values for the parameter Jnr (non-recoverable creep compliance) and for %R (percent recovery), which depend on the traffic loading to which the asphalt binder will be designed. The other standard considered for PG purposes (AASHTO M 332, 2014) requires maximum values for the parameter Jnr (non-recoverable creep compliance) and for %R (percent recovery), which depend on the traffic loading to which the asphalt binder will be designed This parameter is obtained by means of the multiple stress creep and recovery (MSCR) test, which was developed by D’Angelo et al [4] and has been widely investigated by several researchers in the past years in terms of testing geometry, number of cycles, time of creep, time of recovery, stress sensitivity parameter, and loading magnitude. Asphalt mixtures specimens were produced with the same asphalt binders previously tested, and the wheel-tracking test was performed to analyze rut depth
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