Abstract
Recycling technology is widely used in the asphalt road construction due to its environmental and economic effects. Many efforts have focused on the performance restoration of aged base asphalt by adding light oil, but the possibility of recycling the aged asphalt using low-viscosity asphalt and polymers has been few explored. Therefore, the objective of this research is to use polymer-modified low-viscosity asphalt as rejuvenator to recycle the aged asphalt. The conventional properties, rheological behaviors as well as anti-aging performance of polymer-modified recycled asphalts were evaluated by rotational viscosity (RV) tests, dynamic shear rheometer (DSR) tests and bending beam rheometer (BBR) tests. Moreover, the effects of the concentration ratio between polymer-modified low-viscosity asphalt rejuvenator and aged asphalt on the high-temperature anti-rutting, low-temperature cracking resistance, fatigue and aging resistance abilities of recycled asphalt were studied. The results show that the low-viscosity asphalt can increase viscous components and restore the workability of aged asphalt. However, the addition of low-viscosity asphalt weakens the high-temperature properties, temperature sensitivity and anti-aging performance of aged asphalt. Fortunately, the high-temperature rutting resistance, temperature sensitivity, viscoelastic properties, low-temperature cracking resistance, anti-fatigue and aging resistance performance of recycled asphalt can be enhanced remarkably by adding SBS and CR. Meanwhile, SBS-modified recycled asphalt has better fatigue and low temperature cracking resistance properties, while CR-modified recycled asphalt has the advantages on the rutting resistance, anti-aging and temperature sensitivity performance. Furthermore, SBS5-5 and CR6-4 modified recycled asphalts both have better pavement performance than others, which is superior to the requirements of polymer modified asphalt. Therefore, it is meaningful and feasible to recycle the aged base asphalt to be polymer-modified asphalt.
Highlights
It is a known fact that the application of reclaimed asphalt pavement (RAP) has numerous advantages in terms of saving natural resources, protecting environment and reducing construction cost (Liu et al, 2019), which has been widely used to produce the asphalt mixture with new asphalt binder and aggregate together for several decades (Song et al, 2018; Aguirre et al, 2016)
It can be concluded that low-viscosity asphalt can impair the zero-shear viscosity and high-temperature properties of aged asphalt dramatically, which can be further improved by adding SBS and crumb rubber (CR)
This research investigated the possibility of using polymers (CR and SBS) modified low-viscosity asphalt as rejuvenators to recycle the aged asphalt
Summary
It is a known fact that the application of reclaimed asphalt pavement (RAP) has numerous advantages in terms of saving natural resources, protecting environment and reducing construction cost (Liu et al, 2019), which has been widely used to produce the asphalt mixture with new asphalt binder and aggregate together for several decades (Song et al, 2018; Aguirre et al, 2016). It is essential to restore and enhance the viscoelastic and engineering performance of aged asphalt. S. Ren et al / Journal of Cleaner Production 253 (2020) 120048 properties of aged asphalt (Ma et al, 2019; Zhu et al, 2017; Pahlavan et al, 2018; Zeng et al, 2018). Many rejuvenators were developed and used into recycling of aged asphalt, such as aromatic oil, bio-oil, waste vegetable oil, waste engine oil and fresh asphalt, which can effectively regain and further enhance the performance of aged asphalt (Pahlavan et al, 2018; Chen et al, 2014)
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