Effects of rejuvenator on performance-based properties of rejuvenated asphalt binder and mixtures

Shen, Junan; Amirkhanian, Serji; Tang, Boming

doi:10.1016/j.conbuildmat.2006.03.006

Cited by 164 publications

(62 citation statements)

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“…Some previous studies show that the performance of recycled mixtures is equally good or better than new mixtures. A study that used the Indirect Tensile Strength test and Asphalt Pavement Analyzer showed that mixtures containing RAP successfully passed specification requirements and generally had better performance than new mixtures [7]. A more comprehensive work that included using the energy ratio concept confirmed that inclusion of RAP generally increases the tensile strength.…”

Section: Introductionmentioning

confidence: 84%

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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Section: Introductionmentioning

confidence: 84%

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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“…In recent years, many researchers have investigated ageing behavior based on macro-and microperformance by simulating long-term ageing in laboratory [10]. Optimum contents and effects of rejuvenators on performance-based properties of recycled asphalt binders have been studied [11][12][13]. Analysis of binders' ageing rate shows that selecting the proper rejuvenator can extend the binders' service life up to 10 years more than that softened by a less effective rejuvenator [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Asphalt Binders Ageing Behavior and Rejuvenating Feasibility in Multicycle Repeated Ageing and Recycling

Nie

Sun

et al. 2018

Advances in Materials Science and Engineering

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Multicycle repeated utilization of reclaimed asphalt pavement (RAP) is a quite recent development of sustainable pavement materials technology. To investigate ageing rules and recycling possibility of asphalt binders in repeatedly used asphalt mixture, virgin asphalt AH-70 samples were heated by the rolling thin film oven test (RTFOT) at 163°C, respectively, for 40, 85, 180, 240, and 300 minutes to simulate different ageing degrees, and then the aged ones were rejuvenated by adding a self-made rejuvenator.is ageing and recycling process was repeated altogether for 5 cycles to simulate repeated use of RAP binders. In repeated recycling, rejuvenator contents for different cycle numbers or ageing durations were not the same, and the optimum ones were initially estimated by an empirical formula and finally obtained by comparative tests. Empirical rheological tests and the infrared spectral (IR) analysis were done before and after each cycle of recycling. Results indicate that for impact on deterioration of asphalt binders, ageing time is more important than cycle number. Meanwhile, the asphalt after multicycle repeated ageing and recycling can be restored to the empirical rheological indices level of the virgin asphalt and meet specifications requirements.

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“…In some state DOTs, soft asphalt binders have been used exclusively as recycling agents, but some state DOTs, mainly in the western U.S., permit the use of rejuvenators (Newcomb et al, 2007). Even with these benefits, some state agencies have limited the use of rejuvenators because of potential rutting-related concerns (Shen et al, 2007b).…”

Section: Literature Review___________________________________________mentioning

confidence: 99%

“…The use of rejuvenators is not encouraged by some state DOTs because of the concern with rutting development (Shen et al, 2007b;Mogawer et al, 2015). One alternative is the use of modified asphalt binders instead of soft asphalt binders, aiming at alleviating the concerns regarding rutting (Mogawer et al, 2012;Mogawer et al, 2015).…”

Section: Literature Review___________________________________________mentioning

confidence: 99%

“…Mogawer et al (2013) reported that the rejuvenators were able to reduce the resulting binder stiffness and increase the resistance of the HMA to cracking formation. Some researchers had studied the effect of different rejuvenators in the light of performance-based specifications and developed blending charts based on the Superpave binder tests, using conventional and modified asphalt binders (Shen et al, 2007b;Zaumanis et al, 2014a). Shen et al (2007b) worked with concentrations of rejuvenating agents varying from 0 to 14% and used the Superpave parameters as a tool to obtain the ideal concentration of rejuvenating agent aiming at achieving a certain binder performance grade.…”

Section: Literature Review___________________________________________mentioning

confidence: 99%

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Evaluation of the fatigue performance of fine aggregate matrices prepared with reclaimed asphalt pavements and shale oil residue

Klug¹

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A incorporação de misturas asfálticas fresadas na produção de misturas asfálticas novas é uma alternativa útil à utilização de materiais novos, gerando benefícios econômicos e ambientais. A reciclagem de pavimentos criou um ciclo sustentável de reuso de recursos naturais não-renováveis, reduzindo a demanda por agregado mineral e asfalto novos. No entanto, a adição do material fresado, especialmente em proporções altas, provoca aumento na rigidez da mistura asfáltica, causado pela alta rigidez do asfalto envelhecido. Uma elevada rigidez pode tornar a mistura asfáltica mais propensa ao trincamento por fadiga. Para contornar tal desvantagem e permitir a adição de maiores quantidades de material fresado, asfaltos de baixa consistência e agentes de rejuvenescimento podem ser adicionados à mistura. Os asfaltos de baixa consistência atuam para reduzir a rigidez do asfalto envelhecido e os agentes de rejuvenescimento atuam para restaurar as propriedades originais do asfalto envelhecido, aproximando-as das exigidas pelas especificações para asfaltos virgens. O resíduo de óleo de xisto é um dos agentes rejuvenescedores mais utilizados no Brasil e, segundo a literatura, resulta em desempenho comparável ao desempenho de outros agentes rejuvenescedores comerciais, com a vantagem de apresentar maior poder de rejuvenescimento devido à sua maior aromaticidade. O processo de trincamento por fadiga principia nas microtrincas presentes na matriz de agregado fino (MAF) da mistura asfáltica. Uma abordagem para avaliar o comportamento à fadiga das misturas asfálticas é baseada na teoria do dano contínuo em meio viscoelástico, pela qual o processo de trincamento do material é representado por variáveis de estado interno associadas à redução na integridade do material. Neste estudo, ensaios em amostras de MAF foram feitos para caracterizar o desempenho à fadiga, e os dados foram analisados utilizando a teoria do dano contínuo em meio viscoelástico. O objetivo da pesquisa foi avaliar o desempenho à fadiga de MAFs produzidas com três proporções de material fresado (20, 40 e 100%), dois asfaltos com diferentes graus de desempenho (PG 64-22 e PG 58-16), e três combinações (100/0, 50/50, 0/100) de asfalto PG 64-22 e agente de rejuvenescimento (resíduo de óleo de xisto). Dentre as MAFs preparadas com material fresado, duas apresentaram desempenho à fadiga superior à mistura de controle (composta apenas com materiais novos): a MAF composta com 40% de material fresado e PG 64-22 e a MAF composta com 20% de material fresado e PG 58-16. O resíduo de óleo de xisto não atuou como rejuvenescedor do asfalto envelhecido, para a maioria dos casos avaliados, provavelmente devido à baixa taxa de difusão do material no asfalto envelhecido. Palavras-chave:Matrizes de agregado fino, misturas asfálticas fresadas, dano contínuo em meio viscoelástico (VECD), resíduo de óleo de xisto. The incorporation of recycled asphalt pavements (RAP) in the production of new asphalt mixtures is a useful alternative to the use of virgin materials, leading to economic and en...

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Effects of rejuvenator on performance-based properties of rejuvenated asphalt binder and mixtures

Cited by 164 publications

References 1 publication

The Effect of Aging on the Cracking Resistance of Recycled Asphalt

The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Experimental Investigation on Asphalt Binders Ageing Behavior and Rejuvenating Feasibility in Multicycle Repeated Ageing and Recycling

Evaluation of the fatigue performance of fine aggregate matrices prepared with reclaimed asphalt pavements and shale oil residue

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