The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Mohammadafzali, Mojtaba; Ali, Hesham; Musselman, James A.; Sholar, Gregory A.; Massahi, Aidin

doi:10.1155/2017/7240462

Cited by 18 publications

(5 citation statements)

References 15 publications

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“…Increasing the asphalt binder's aging reduced its ductility and relaxation capability [2], and it increased the cracking ability [24]. The use of RAS in asphalt binders increased the binders' fatigue cracking resistance, yielding higher fatigue life or the number of load repetitions to failure (Nf) values [25].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Extracted Asphalt Binders from Field Cores Containing Recycled Components: Load- and Non-Load-Associated Cracking Resistance

Deef-Allah

Abdelrahman

2023

AMR

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Modifying asphalt mixtures with recycled components is common practice due to their environmental and economic merits. However, due to the oxidized air-blown asphalt binders in recycled asphalt shingles (RAS) and aged binders in reclaimed asphalt pavement (RAP), adopting RAP and/or RAS as recycled components in asphalt mixtures influences the performance of the overall asphalt binder in these mixtures. The percentages of recycled components and performance grade (PG) of virgin asphalt binders (VABs) in the asphalt mixtures govern the performance of the overall asphalt binder. Therefore, the main idea of this study was to investigate the effect of the percentages of RAP/RAS and PGs of the VABs on the load- and non-load-associated cracking resistance of the extracted asphalt binders (EABs) from field cores. Rheological tests were performed on the EABs to assess the load-associated cracking (fatigue cracking) and non-load-associated cracking (low-temperature and block cracking) resistance. The VAB's PGs, mixtures' ages, and the percentages of RAP/RAS affected the EABs' cracking resistance. When compared to EABs from mixtures with lower amounts of RAP, employing RAS in the asphaltic mixtures improved EABs' resistance to fatigue and block cracking. However, using RAS deteriorated EABs' resistance to low-temperature cracking. Increasing the RAP's percentage in the asphaltic mixtures decreased the cracking resistance of the EABs. Strong relationships were established between EABs' load- and non-load-associated cracking resistance.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Extracted Asphalt Binders from Field Cores Containing Recycled Components: Load- and Non-Load-Associated Cracking Resistance

Deef-Allah

Abdelrahman

2023

AMR

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“…Because the oxidized and aged binders in RAS enhanced the stiffness and elasticities of the binder, utilizing RAS in asphalt mixes increased the rutting resistance of the mixes and extracted asphalt binders as compared to virgin mixes and binders [4,5]. However, increasing the stiffness of the asphalt binder lessened its ductility, and relaxation potential, and increased its cracking capability [6,17,18].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Contribution of Recycled Asphalt Shingles to Asphalt Binders Using Rejuvenators

Deef-Allah¹,

Abdelrahman²

2022

J. Engg. Res. & Sci.

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Recycled asphalt shingles (RAS) have been a valuable recycled component in asphalt mixes for decades. However, research into how the aged and oxidized air-blown RAS binder interacts with the neat asphalt binders in asphalt mixtures is underway. Furthermore, due to the stiffness of RAS binders, RAS-containing asphalt mixtures are prone to significant cracking, particularly at low temperatures. As a result, an innovative technique was developed and used in this study to increase the contribution of RAS particles in the asphalt binder. This technique was primarily dependent on interacting RAS particles with rejuvenators before mixing them with the asphalt binder. Moreover, this technique allowed the oxidized and aged binders in the RAS to absorb aromatics to compensate for the lost low-molecular-weight fractions during the air-blowing process and alter their aged behavior. Five rejuvenators were utilized, including four pyrolysis oils (B2A, P4, P8, and P4D) and one recycling agent (Evoflex). One source of post-consumer RAS was collected, milled, and sieved into two sizes. The rejuvenator was chosen to weigh 45% of the RAS, except for the P4D, which contained a double amount of P4 oil and weighed 90% of the RAS. RAS or the RAS that interacted with oils, was mixed with one source of asphalt binder with a performance grade of 76−16. The RAS with rejuvenator samples weighing 7.5% and 15% of the asphalt binder interacted with the neat binder. The addition of P4D or Evoflex to RAS reduced the stiffness and elasticity of the modified asphalt binders due to the RAS particles' absorption of aromatics in oils. This trend improved the modified binders' fatigue and thermal cracking resistance. Milled RAS particles of a smaller size (50-100) reacted with oils more than RAS particles of a bigger size (30-50), which caused stiffer properties for the binders modified with the smaller RAS particle size.

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“…The aging of asphalt pavement refers to the deterioration of its performance due to irreversible physical and chemical variations caused by exterior environmental agents in terms of moisture, sunlight and oxygen during the service process [13,14]. The aging of an asphalt mixture generally results in an increase in high-temperature rutting resistance, but a significant reduction in moisture stability, low-temperature workability and fatigue resistance, which exacerbates the generation of various diseases on asphalt pavement [15,16].…”

Section: Introductionmentioning

confidence: 99%

Damage Fracture Characterization of Asphalt Mixtures Considering Freeze–Thaw Cycling and Aging Effects Based on Acoustic Emission Monitoring

Zhou

Yuan³

et al. 2021

Materials

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Freeze–thaw (F–T) cycling and aging effects are the main factors contributing to the deterioration of asphalt mixtures. The acoustic emission (AE) technique enables real-time detection regarding the evolution of internal damage in asphalt mixtures during the loading process. This study set out to investigate the effects of F–T cycling and aging on the damage characteristics of asphalt mixture under splitting loads. Firstly, the Marshall specimens were prepared and then exposed to various numbers of F–T cycles (one, three, five, and seven) and different durations of aging (short-term aging and long-term aging for 24, 72, 120 and 168 h), after which the specimens were loaded by means of indirect tensile (IDT) testing, and corresponding parameters were synchronously collected by the AE acquisition system during the fracture process. Finally, the energy, cumulative energy and peak frequency were selected to investigate the damage mechanisms of asphalt mixtures. The findings demonstrate that the AE parameters provided effective identification of the deterioration for all specimens in real-time, and that the F–T cycling and aging effects altered the damage characteristics of asphalt mixtures, causing early damage, exacerbating the formation of micro-cracks in the early stage, accelerating the expansion of macro-cracks and advancing the debonding between the asphalt and aggregates. The findings of this study provide further insight into the mechanism of F–T cycling and aging effects on the deterioration of asphalt mixture.

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The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Cited by 18 publications

References 15 publications

Performance Evaluation of Extracted Asphalt Binders from Field Cores Containing Recycled Components: Load- and Non-Load-Associated Cracking Resistance

Performance Evaluation of Extracted Asphalt Binders from Field Cores Containing Recycled Components: Load- and Non-Load-Associated Cracking Resistance

Enhancing the Contribution of Recycled Asphalt Shingles to Asphalt Binders Using Rejuvenators

Damage Fracture Characterization of Asphalt Mixtures Considering Freeze–Thaw Cycling and Aging Effects Based on Acoustic Emission Monitoring

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