Effect of recycling agents in recycled asphalt binders observed with microstructural and rheological tests

Menapace, Ilaria; Cucalon, Lorena Garcia; Kaseer, Fawaz; Martin, Amy Epps; Masad, Eyad; King, Gayle

doi:10.1016/j.conbuildmat.2017.10.017

Cited by 73 publications

(19 citation statements)

References 18 publications

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“…Previous studies have shown the effectiveness of recycling agents in softening the RAP binder and improving the performance of recycled asphalt mixes by mitigating the stiffness and brittleness of the RAP binder (10,(13)(14)(15)(16)(17)(18)(19)(20)(21). To evaluate the effect of recycling agent addition on the RAP BAF, a modified vegetable oil was added to the RAP asphalt mixes at a dose of 5%.…”

Section: Recycling Agent Addition and The Methods Of Additionmentioning

confidence: 99%

A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

Kaseer

Martin

2019

Transportation Research Record

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State highway agencies recognize the environmental and economic benefits of utilizing reclaimed asphalt pavement (RAP) in asphalt mixes. Currently, most agencies assume all of the RAP binder content is available for mix design purposes. However, the percentage of available or effective RAP binder in the asphalt mix is usually less than 100% and not quantified, which could yield dry asphalt mix with a high air void content, potentially leading to premature distress. The term available or effective RAP binder refers to the binder that is released from the RAP, becomes fluid, and blends with virgin binder under typical mixing temperatures. This study proposes a method to estimate the RAP binder availability factor (BAF) which can be used to adjust the virgin binder content in RAP mixes to ensure that the mix design optimum binder content is achieved. In this method, asphalt mixes were prepared so that, after mixing and conditioning, the RAP material can be separated from the virgin aggregate, which allows for a thorough evaluation of the extent of RAP binder availability in the asphalt mix. This method was verified in a preliminary experiment and then used to estimate the BAF of RAP from different sources, and a correlation between RAP BAF and the high temperature performance grade (PG) of each RAP source was established. Finally, factors affecting the RAP BAF were also evaluated such as mixing temperature, conditioning period, the use of recycling agents (or rejuvenators), and the method of adding the recycling agent to the mix.

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Section: Recycling Agent Addition and The Methods Of Additionmentioning

confidence: 99%

A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

Kaseer

Martin

2019

Transportation Research Record

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“…The ageing of bio-rejuvenating agents is related to higher loss of mass than in VA because of water loss (biomass has plenty of moisture) and volatilisation of weight compounds [79,88]. Therefore, the benefit of incorporating rejuvenating agents are compromised due to ageing [37,89]. Moisture can severely damage asphalt mixtures by failing both cohesion and adhesion [25].…”

Section: Rejuvenation Of Recycled Asphalt Using Bio-oil Productsmentioning

confidence: 99%

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

et al. 2021

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Reclaimed asphalt pavement (RAP) has received much attention recently due to its increased use in hot mix asphalt (HMA) pavements to enhance pavement sustainability. The use of aged asphalt in RAP, which is highly oxidised and has lost its properties due to exposure to traffic loads and climatic conditions throughout its lifespan, can cause asphalt mixtures to stiffen and embrittle, thus negatively affecting the behaviour of asphalt mixtures. This issue may be resolved by including rejuvenating agents that can restore both physical and rheological properties of aged asphalt by increasing maltene fractions and decreasing asphaltene. However, the high restoration capacity of any kind of rejuvenating agent does not assure the durability of restored aged asphalt. This study explored the performance and durability of rejuvenated asphalt mixtures embedded with several types of rejuvenators identified from the extensive literature review. The study serves as a significant reference to predict future challenges in rejuvenating aged asphalt.

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“…the value of G–R at 15°C and 0.005 rad/s is determined based on master curves of the frequency sweep testing data. Results of | G *| and δ (15°C as a reference) can be plotted in black space diagrams, where an aged bitumen can be evaluated about its damage degree without imposing a rigid single test temperature and frequency, which makes the G–R parameter an effective rheological index to evaluate the cracking resistance of bitumen with different aging conditions 27 …”

Section: Materials and Preparationmentioning

confidence: 99%

Evaluation of liquid rubber content and molecular weight on rheological properties of asphalt

Ma²,

et al. 2021

J of Applied Polymer Sci

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To evaluate the effect of liquid styrene‐butadiene rubber (LSBR) on the rheological performance of bitumen, LSBRs with molecular weights of 20,000 (LA) and 50,000 g/mol (LB) are blended into the virgin bitumen. The rheological effect regarding LSBR content and the molecular weight of the bitumen was then conducted by dynamic shear rheometer (DSR) test and a bending beam rheometer (BBR) test, respectively. Short‐term and long‐term aging tests were used to simulate the asphalt aging with modification of LSBR, and the variations of asphalts function groups were detected by Fourier Transform Infrared spectroscopy (FT‐IR). Results indicate that LSBR reduces the rutting and ageing resistance of the virgin bitumen. However, the blended LA and LB extensively enhance the crack resistance at low temperatures. Moreover, the LB modifier improves the fatigue performance of the asphalt more evidently, followed by LA, particularly at 2% mixing content (by weight of the virgin). Compared with LA, the added LB causes more deteriorating impact bitumen's rutting resistance, whereas LB increases the crack resistance at low temperatures. Of note, the LB‐modified bitumen exhibits less ageing sensitivity than the LA‐modified bitumen under a short‐term ageing simulation. However, the LA‐modified bitumen is less sensitive to the long‐term ageing test.

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Effect of recycling agents in recycled asphalt binders observed with microstructural and rheological tests

Cited by 73 publications

References 18 publications

A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

Evaluation of liquid rubber content and molecular weight on rheological properties of asphalt

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