Abstract
This article presents a novel potential bio-based rejuvenator derived from waste pig fat (WPF) for use in recycled asphalt applications. To achieve this purpose, the impact of different doses waste pig fat (e.g., 0, 3, 6, and 9 wt.% WPF) on the reclaimed asphalt pavement binder (RAP-B) performance is investigated. The unmodified and WPF-modified asphalts are characterized by means of Fourier-transform infrared spectroscopy (FT-IR), thin-layer chromatography–flame ionization detection (TLC-FID), scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Physico-rheological properties of asphalt blends are assessed through Brookfield viscometer, softening point, penetration, and dynamic shear rheometer (DSR) tests. TLC-FID data highlighted that incremental WPF addition into RAP-B restored its original balance maltenes-to-asphaltenes ratio; finding which was supported by FT-IR analysis. SEM disclosed that WPF has a great compatibility with the aged asphalt. AFM observations showed that grease treatment induced a decline in surface roughness (i.e., bee structures) and a rise in friction force (i.e., para-phase dimension) of RAP binder. TGA/DSC studies revealed that the bio-modifier not only possesses an excellent thermal stability but also can substantially enhance the binder low-temperature performance. Empirical and DSR tests demonstrated that WPF improved the low-temperature performance grade of RAP-B, reduced its mixing and compaction temperatures, and noticeably boosted its fatigue cracking resistance. The rejuvenation of aged asphalt employing WPF is feasible and can be an ideal approach to recycle both of RAP and waste pig fats.
Highlights
The use of processed reclaimed asphalt pavement (RAP) in paving mixtures has been common practice in the Republic of Korea
The asphalt becomes rheologically unstable owing to the discontinuity that occurs between the saturated compounds and the remaining chemical species [3]
Fourier-Transform Infrared Spectroscopy (FT-IR) spectroscopy was employed to elucidate the influence of waste pig fat (WPF) on the functional groups, molecular structures and composition of reclaimed asphalt pavement binder (RAP-B)
Summary
The use of processed reclaimed asphalt pavement (RAP) in paving mixtures has been common practice in the Republic of Korea. Materials 2020, 13, 1002 substantial amounts of RAP into new paving mixtures constitutes a critical concern, because the resultant blends may be vulnerable to adhesion and cohesion distress as well as cracking failures during the service life of the road pavement [1]. This is due primarily to the oxidative aging of the asphalt binder coating the aggregates enclosed in the RAP material. This instability eventually provokes a lack of cohesion within the binder, which may lead to cracking
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