Abstract
Asphalt mastic is a combination of binder and filler. The binder-filler system within asphalt mixtures plays an important role in adhesion between mineral aggregates. The aging of binders in pavement always happens with fillers inside or contact with mineral aggregates, so it is critical to investigate the evolved rheological property of binder-filler systems during oxidative aging. In this study, simple film oven aging methods for the aging of mastics (binder-filler system) were conducted and verified by comparing the master-curves of aged mastics at different oven positions or different aging times. The frequency sweep test was performed to measure the changing stiffness of mastics with a different combination of binders and filler contents. Test results show that oven positions could influence the aging effect of the mastics significantly, given the influence of circulation. With increasing aging times, the complex modulus increases while phase angle decreases. Comparing the mastics which were first aged then mixed with mastics which were first mixed then aged, it was observed that fillers inside the binder could accelerate aging of the mastics. Additionally, the aging index of mastics with different combinations showed that both the modification of binders and filler contents could affect the aging rate of the mastics.
Highlights
The oxidative behavior of asphalt is thought to be a critical factor contributing to the performance of hot-mix asphalt (HMA) pavements [1,2]
In order to investigate the rheological properties of aged asphalt mastics, the asphalt mastics were aged by a verified thin-film oven method firstly, and mastics under different aging conditions with different compositions were tested by the dynamic shear rheometer (DSR) and the rheological parameters from the master-curve were analyzed and compared
The temperature sweep (TTS) test was conducted on both virgin mastics and mastics after 8 h of aging
Summary
The oxidative behavior of asphalt is thought to be a critical factor contributing to the performance of hot-mix asphalt (HMA) pavements [1,2]. The ever-changing chemistry, kinetics, and mechanisms of the binder cause the deterioration of pavement performance, which has significant negative influence on the durability of asphalt mixtures, reducing the service life of asphalt pavement [3]. One is the short-term aging, which is caused by heating during the construction. The other one is the long-term aging during the service time. Both the traffic effect and environmental condition could cause the aging or decay of the asphalt binder [5]. The rolling thin-film oven tests (RTFOT) play an important role in quantifying the extent of binder oxidation and hardening during the construction
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