The effect of rejuvenators on the aging resistance of recycled asphalt mixtures

Ziari, Hassan; Moniri, Ali; Bahri, Parastoo; Saghafi, Yasha

doi:10.1016/j.conbuildmat.2019.06.181

Cited by 74 publications

(31 citation statements)

References 61 publications

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“…A rejuvenator or softer asphalt binder can adjust the compositions of the aged asphalt binder in order to recover its rheological properties to some degree [19,20]. Nevertheless, rejuvenated asphalt binders present inferior re-aging resistance than fresh binders, despite the desirable performance at an early stage [21,22]. As a result, the long-term instability and accelerated performance deterioration have been considered to be the main deficiencies of rejuvenated asphalt mixtures [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Zhang

et al. 2020

Materials

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Incorporating reclaimed asphalt pavement (RAP) into asphalt mixtures achieves astonishingly environmental and economic benefits. However, there is hesitation to use higher RAP content due to the concern regarding the deterioration in pavement performance, especially the cracking resistance. Basalt fiber has been considered an effective additive to reinforce the performance of asphalt mixtures and, subsequently, the reinforcement effect is also expected for high-RAP content mixtures. Therefore, this study investigated the effect of basalt fiber on the pavement performance of asphalt mixtures with 0%, 30%, 40%, and 50% RAP contents against high-temperature performance, moisture susceptibility, low-temperature and intermediate-temperature cracking resistance, based on the wheel-tracking test, the uniaxial penetration test, the freeze-thaw splitting test, the low-temperature bending beam test, the semicircular bend fracture test and the indirect tensile asphalt cracking test, respectively. In addition, a performance-space diagram was developed to determine the mixture performance shift caused by basalt fiber. The results showed that adding basalt fiber compensated for the detrimental effect caused by RAP, leading to significant enhancement in moisture susceptibility and low- and intermediate-temperature cracking resistance of mixtures with high RAP content, along with the enhancement in high-temperature performance, indicating that basalt fiber can contribute to the use of high RAP content.

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Section: Introductionmentioning

confidence: 99%

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Zhang

et al. 2020

Materials

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“…It can be seen from Figure 7 that (1) since a large amount of light components in wood tar can dilute the heavy components in aged asphalt, the flexibility of rejuvenated asphalt increased with the increase of light components [58,59]. With the increase of the content of wood tar, the ductility of rejuvenated asphalt increased continuously, and when the content of wood tar is 10-15wt%, the It can be seen from Figure 7 that (1) since a large amount of light components in wood tar can dilute the heavy components in aged asphalt, the flexibility of rejuvenated asphalt increased with the increase of light components [58,59]. With the increase of the content of wood tar, the ductility of rejuvenated asphalt increased continuously, and when the content of wood tar is 10-15wt%, the ductility value of rejuvenated asphalt increased rapidly.…”

Section: Ductilitymentioning

confidence: 99%

Preparation and Properties of Wood Tar-based Rejuvenated Asphalt

Zhang

Zhu

Wu³

et al. 2020

Materials

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In order to explore the applicability of the rejuvenated asphalt with wood tar as the main raw material, the orthogonal test was used to determine the optimal ratio of wood tar-based rejuvenator. The physical properties, rheological properties and components of matrix asphalt, aged asphalt, wood tar-based rejuvenated asphalt and commercial RA-102# rejuvenated asphalt were tested and compared. The results show that the optimal ratio of wood tar-based rejuvenator is 15wt% wood tar, 0.3wt% biomass fiber, 5wt% plasticizer, 0.3wt% compatibilizer, and 1wt% stabilizer of the mass of aged asphalt. Wood tar-based rejuvenator can restore the physical properties of the aged asphalt to meet the specification requirements. The synergistic effect of biomass fiber and plasticizer make the wood tar-based rejuvenated asphalt has good resistance to accumulated permanent deformation, but its low-temperature cracking resistance needs to be further improved. During the rejuvenation process of aged asphalt, the colloidal state changes from gel-state to sol-state, characterizing that the viscosity of asphalt decreased and the fluidity increased. Wood tar-based rejuvenator can react with aged asphalt to weaken the vibration strength of carbonyl and sulfoxide groups, so as to realize the recovery of service performance. Wood tar-based rejuvenator has better environmental protection and applicability, which is worthy of further study and promotion.

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“…However, as the influence of load, light, precipitation, and climate changes, its durability decreases, and its service life dropped to less than ten years. Moreover, the current service level of the ultrathin wear course during the service period is low, such as poor flatness, fast antiskid attenuation, and loud driving noise, which not only reduces driving comfort but also increases noise pollution and traffic safety [7][8][9][10][11]. erefore, it should not only meet the structural performance requirements but also have sufficient flatness, antiskid performance, wear resistance, low noise, and other functional properties.…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance and Adhesion Behavior of Ultrathin Wearing Course Using Calcined Bauxite as Aggregate

Sheng

Wang

Jia

et al. 2021

Mathematical Problems in Engineering

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An ultrathin wearing course is an effective maintenance treatment for prolonging the service life of asphalt pavements, which have been widely used in the field of pavement construction and road maintenance. However, the repeated vehicle load and wear results in a decreased durability of ultrathin wear course cover pavement. Hence, the gradation of ultrathin wear course was designed using calcined bauxite in this study, and the water stability, low-temperature properties, resistance to permanent deformation, and salt erosion were investigated through a laboratory test. Results indicated that the addition of a nonammonia antistripping agent significantly improves the water stability of the asphalt mixture with calcined bauxite and its ability to resist salt erosion as well as improve its low-temperature deformation ability. At the same time, polyphosphoric acid improves the adhesion between asphalt and calcined bauxite aggregate and the high-temperature performance of asphalt mixture but has limited improvement in water stability and resistance to salt erosion. This research is conducive to the widespread use of calcined bauxite aggregates in road pavements and is of great significance for improving the durability of ultrathin wear course asphalt pavements.

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The effect of rejuvenators on the aging resistance of recycled asphalt mixtures

Cited by 74 publications

References 61 publications

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Preparation and Properties of Wood Tar-based Rejuvenated Asphalt

Study on the Performance and Adhesion Behavior of Ultrathin Wearing Course Using Calcined Bauxite as Aggregate

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