A simple method using a dynamic shear rheometer is proposed for determining high-temperature key parameters of asphalt binders in place of the ring-and-ball softening point, currently used in Germany. The test was recently introduced in the German standards under the name Bitumen-Typisierungs-Schnell Verfahren (BTSV), which translates to Binder-Fast-Characterization-Test. Two key parameters are obtained as the result of the test: the temperature T-BTSV, at which the shear modulus is equal to 15.0 kPa, and the corresponding phase angle delta(BTSV). While T-BTSV provides information on material hardness, dBTSV indicates the degree of modification. Based on these two parameters, a classification system is proposed for different asphalt binder grades commonly used in Europe. Additionally, the procedure was applied for rejuvenating aged asphalt binder extracted from reclaimed asphalt pavement (RAP). A linear relation is observed for the two key parameters when blending RAP binder with different proportions of rejuvenator. These findings were used to evaluate the effectiveness of different rejuvenating additives.
A New Binder-Fast-Characterization-Test Using a Dynamic Shear Rheometer and Its Application for Rejuvenating Reclaimed Asphalt Binder
Riccardi, CFormal Analysis
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2020-01-01
Abstract
A simple method using a dynamic shear rheometer is proposed for determining high-temperature key parameters of asphalt binders in place of the ring-and-ball softening point, currently used in Germany. The test was recently introduced in the German standards under the name Bitumen-Typisierungs-Schnell Verfahren (BTSV), which translates to Binder-Fast-Characterization-Test. Two key parameters are obtained as the result of the test: the temperature T-BTSV, at which the shear modulus is equal to 15.0 kPa, and the corresponding phase angle delta(BTSV). While T-BTSV provides information on material hardness, dBTSV indicates the degree of modification. Based on these two parameters, a classification system is proposed for different asphalt binder grades commonly used in Europe. Additionally, the procedure was applied for rejuvenating aged asphalt binder extracted from reclaimed asphalt pavement (RAP). A linear relation is observed for the two key parameters when blending RAP binder with different proportions of rejuvenator. These findings were used to evaluate the effectiveness of different rejuvenating additives.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
