Abstract:

The asphalt is easy to static harden and oxidative harden under environmental effects to induce its change of rheological characteristics, which can seriously influence the durability of asphalt pavement. Therefore, it is critical to reasonably evaluate and select the asphalt to ensure the quality of asphalt pavement. Based on the results of the components of three base asphalts and their conventional tests (penetration, soften point and ductility) and SHRP tests (DSR and BBR test), the aging behavior and mechanism of base asphalts were analyzed based on the FTIR test. The results showed that although the conventional tests can describe the variations of base asphalts before and after asphalt aging, they can only provide the test message of specific temperature and load frequency. On the contrary, SHRP tests can reflect the influence of aging to the whole rheological behavior of base asphalt. Therefore, SHRP rheological indexes, especially BBR test results, were suggested as the evaluation indexes of the asphalt aging characteristic.

Key words: aging behavior, conventional tests, SHRP tests, FTIR Test, dynamic mechanical temperature spectra