Abstract
Increasing the content of reclaimed asphalt pavement material (RAP) in hot-mix recycled asphalt mixture (RHMA) with a satisfactory performance has been a hot topic in recent years. In this study, the performances of Trinidad lake asphalt (TLA), virgin asphalt binder, and aged asphalt binder were first compared, and then the modification mechanism of TLA on virgin asphalt and aged asphalt was explored. Furthermore, the RHMA was designed in accordance with the French norm NF P 98-140 containing 50% and 100% RAP, and their high-temperature stability, low-temperature cracking resistance, and fatigue performances were tested to be compared with the conventional dense gradation AC-20 asphalt mixture. The results show that the addition of TLA changes the component proportion of virgin asphalt binder, but no new functional groups are produced. The hard asphalt binder modified by TLA has a better rutting resistance, while the fatigue and cracking resistance is lower, compared to both aged and virgin asphalt. The high-modulus design concept of RHMA is a promising way to increase the RAP content in RHMA with acceptable performance. Generally, the RHMA with 50% RAP has similar properties to AC-20. And, when the RAP content reaches 100%, the high- and low-temperature performance and anti-fatigue performance of RHMA are better than AC-20 mixture. Thus, recycling aged asphalt using hard asphalt binder for hot-mixing recycled asphalt mixture to increase the RAP content is feasible.
Highlights
Recycling the old asphalt pavement is a common operation used worldwide for saving natural materials, investment, and energy in highway maintenance projects [1,2,3,4]
The results show that the addition of reclaimed asphalt pavement (RAP) can be incorporated into high-modulus asphalt concrete (HMAC) at relatively higher contents, due to the similar stiffness between the aged asphalt binder in RAP and the high-modulus asphalt binder
The modification mechanism, microstructure, and rheological properties of hard asphalt binder produced by mixing Trinidad lake asphalt (TLA) and Virgin asphalt (VA) were analyzed using infrared spectroscopy, atomic force microscopy, and DSR and BBR experiments
Summary
Recycling the old asphalt pavement is a common operation used worldwide for saving natural materials, investment, and energy in highway maintenance projects [1,2,3,4]. The aged asphalt binder in RAP is a considerable asset for construction, the incorporation of RAP could potentially reduce the durability in terms of fatigue resistance, low-temperature cracking resistance, and moisture stability due to its poor rheological properties after volatilization and oxidation in the field [12] To this end, the most widely and traditional solution is adding rejuvenators or using soft asphalt binder as the modifier to recover the performance of aged asphalt binder [13,14]. The most widely and traditional solution is adding rejuvenators or using soft asphalt binder as the modifier to recover the performance of aged asphalt binder [13,14] This solution was shown to be effective in previous publications and engineering projects. TLA is a stiffer binder with high modulus and poor workability It is a common modifier for producing hard asphalt binder.
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