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Asphalt binder was recovered from the mixture samples that were obtained during the production of the mixtures. In order to provide sufficient material for the extraction and recovery, mixture samples needed to be combined. The binder was recovered using the centrifuge extraction and rotovapor recovery methods (ASTM D2172 and ASTM D5404). The results of the recovery are listed in Table 12.
| Property | Control Mixture (avg. of 4 samples) | Advera Mixture (avg. of 4 samples) | Sasobit Mixture (avg. of 4 samples) |
|---|---|---|---|
| DSR, G*/sin δ @ 58 °C | 5.495 kPa | 3.786 kPa | 4.202 kPa |
| DSR after PAV, G* (sin δ) @ 16 °C | 3,252 kPa | 2,770 kPa | 2,848 kPa |
| BBR, Stiffness, @ -24 °C | 280 MPa | 246 MPa | 254 MPa |
| BBR, Slope, m-value @ -24°C | .302 | .310 | .313 |
The data indicates that the binder from both of the warm mixes experienced a reduced amount of aging and stiffening. One of the inconsistencies noted is that the Sasobit recovered binder did not show the same stiffening effect that was noted in testing of the original binder sample with 1.5% Sasobit added. However, the results do indicate that the warm mixtures did experience less aging during the manufacturing process due to the reduced hot plant temperatures. For the location of this project, less aging of the binder could be a significant benefit in pavement performance by reducing thermal cracking potential.
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An introductory webinar to assist local and tribal agencies with applying for transportation funding under the Bipartisan Infrastructure Law (BIL).
