Long-Term Aging of Recycled Asphalt Binders: A Laboratory Evaluation Based on Performance Grade Tests

Mohammadafzali, Mojtaba; Ali, Hesham; Musselman, James A.; Sholar, Gregory A.; Kim, S.; Nash, Tanya

doi:10.1061/9780784479216.055

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…The bio-oils in these studies exhibited the characteristics of a rejuvenator. The rate of aging in a recycled, aged binder in the presence of various recycling agents upon re-placement in service (i.e., 'resumed aging' or 're-aging') is very complex, and very important (Mohammadafzali et al, 2015). The rate of re-aging in the long run will obviously depend on the type of recycling agent used.…”

Section: Introductionmentioning

confidence: 99%

Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

Majidifard

Tabatabaee

Buttlar

2019

Journal of Traffic and Transportation Engineering (English Edit

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Highlights The use of waste cooking oil as a recycling agent opens the possibility for the routine design of 60-to-nearly-100% recycled content asphalt paving mixtures. Aging susceptibility of recycled binders with waste cooking oil is higher than virgin binder. Oil has a greater effect on reducing the stiffness of RAP binder than increasing its m-value. Waste cooking oil tended to improve mixture workability and low temperature performance while reducing moisture and rutting resistance. Selecting the optimum oil content as equal to the average oil content based on satisfying the LT and HT PG can assure short-term and long-term performance. AbstractThe environmental and economic benefits of recycling asphalt pavements have received much attention in recent years. Because of the increase in the cost of raw materials and energy carriers, the reuse of large portions of reclaimed asphalt pavement (RAP) is critical in reducing both the cost and environmental footprint of asphalt pavements. High-RAP mixtures are more prone to low temperature cracking and poor mixture workability because of the higher stiffness of RAP binder. Recycling agents are one of the additives which are used to improve these deficiencies. However, there is some ambiguity about the optimum content of recycling agent to assure proper performance of recycled asphalt pavement during its service life. The current study used 60% and 100% fractionated RAP with waste cooking oil as a recycling agent and crumb rubber to alleviate the aforementioned problems.Laboratory evaluation showed that increasing the amount of recycling agent in the high-RAP mixtures improved their workability and low temperature performance while decreasing moisture damage and rutting resistance. The long-term susceptibility to aging of recycled binder with the organically-based recycling agent was also investigated. A procedure to obtain the optimum percentage of recycling agent was devised to strike a balance between the performance characteristics of mixtures with a high-RAP content.

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Section: Introductionmentioning

confidence: 99%

Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

Majidifard

Tabatabaee

Buttlar

2019

Journal of Traffic and Transportation Engineering (English Edit

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“…These rejuvenators made the most durable rejuvenated binders in a binder aging study by the authors of the current paper [12]. PG 95-15 is considered the typical grade for RAP binder based on Florida's experience with binders recovered from RAP [12]. The initial true high temperature grades of the virgin binders were 68.36 ∘ C for Binder 1 and 71.63 ∘ C for Binder 2.…”

Section: Binder Testsmentioning

confidence: 99%

“…The rejuvenators included a heavy paraffinic distilled solvent extract (HPE) and a water-based emulsion from wax-free naphthenic crude with a residue content of 60% (CWE). These rejuvenators made the most durable rejuvenated binders in a binder aging study by the authors of the current paper [12]. PG 95-15 is considered the typical grade for RAP binder based on Florida's experience with binders recovered from RAP [12].…”

Section: Binder Testsmentioning

confidence: 99%

The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Mohammadafzali

Ali

Musselman³

et al. 2017

Advances in Civil Engineering

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Fatigue cracking is an important concern when a high percentage of Reclaimed Asphalt Pavement (RAP) is used in an asphalt mixture. The aging of the asphalt binder reduces its ductility and makes the pavement more susceptible to cracking. Rejuvenators are often added to high-RAP mixtures to enhance their performance. The aging of a rejuvenated binder is different from virgin asphalt. Therefore, the effect of aging on a recycled asphalt mixture can be different from its effect on a new one. This study evaluated the cracking resistance of 100% recycled asphalt binders and mixtures and investigated the effect of aging on this performance parameter. The cracking resistance of the binder samples was tested by a Bending Beam Rheometer. An accelerated pavement weathering system was used to age the asphalt mixtures and their cracking resistance was evaluated by the Texas Overlay Test. The results from binder and mixture tests mutually indicated that rejuvenated asphalt has a significantly better cracking resistance than virgin asphalt. Rejuvenated mixtures generally aged more rapidly, and the rate of aging was different for different rejuvenators.

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“…Insufficiency of the performance grade (PG) binder specification as one of the common methods to evaluate binder performance, especially when it is modified or rejuvenated by additives, has been proved by many researchers [7,8]. To address this issue and as a way to find a better performance-related test method, the LAS and MSCR tests were introduced to evaluate fatigue and rutting performance of the binder, respectively.…”

Section: Introductionmentioning

confidence: 99%

Studying Engineering Characteristics of Asphalt Binder and Mixture Modified by Nanosilica and Estimating Their Correlations

Hasaninia

Haddadi

2018

Advances in Materials Science and Engineering

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e objective of this research was to investigate rutting and fatigue distresses in asphalt containing 2, 4, 6, and 8 percent of nanosilica (NC) and to find out the correlation between engineering properties of the modified binder and mixture asphalt. In order to study the effect of NC on the rutting and fatigue properties of modified binders, the multiple stress creep recovery (MSCR) and linear amplitude sweep (LAS) tests were carried out. e Marshall stability, dynamic creep, and four-point bending beam fatigue tests were used to evaluate performance characteristics of the mixtures. e binder and mixture tests all indicated an improvement of fatigue and rutting resistance using NC as a modifier. Furthermore, some statistical correlations between engineering properties were developed successfully.

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Long-Term Aging of Recycled Asphalt Binders: A Laboratory Evaluation Based on Performance Grade Tests

Cited by 9 publications

References 6 publications

Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Studying Engineering Characteristics of Asphalt Binder and Mixture Modified by Nanosilica and Estimating Their Correlations

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