Effect of SARA on Rheological Properties of Asphalt Binders

Xu, Yongdong; Zhang, Enhao; Shan, Liyan

doi:10.1061/(asce)mt.1943-5533.0002723

Cited by 50 publications

(19 citation statements)

References 20 publications

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“…SARA fractionation is often used to analyze the chemical compositional of asphalt with various crude sources and grades . Especially, there is a close connection between SARA and the stability of asphalt colloidal system, therefore, the change of SARA fraction will affect the asphalt performance . In this research, the SARA fractionation is measured in this research to reveal how PPA influences the chemical fractions on asphalt binders.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

Liu

Zhou²,

Peng³

2020

J of Applied Polymer Sci

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The aim of this research is to evaluate the effect of polyphosphoric acid (PPA) on the mechanical performance of styrene–butadiene–styrene (SBS) and styrene–butadiene–rubber (SBR) modified asphalt. Conventional properties, multiple stress creep recovery (MSCR), bending beam rheometer (BBR), and linear amplitude sweep (LAS) tests were conducted to evaluate the performance characteristics of asphalt at different PPA inclusions. Gel‐permeation chromatography (GPC), saturates, aromatics, resins, and asphaltenes (SARA), and Fourier transform infrared (FTIR) were carried to reveal the molecular weight, component and infrared spectra of asphalt. Results showed that PPA hardened the asphalt, improved the rutting and fatigue performances of polymer modified asphalt (PMA) binder, but weakened the anti‐cracking performances. Besides, storage stability had a significant improvement as the addition of PPA. The addition of PPA brought more macromolecules into asphalt and led to more high‐average molecular weight compounds. Furthermore, PPA changed four component ratios of asphalt. Both PMA with or without PPA have similar absorption peaks. This may be due to absorption peak of PMA covered the changes in PPA modification process as the low content of PPA. 0.8% dosage of PPA may be considered optimum for composite modified binder combining the above experimental results for this binder source.

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Section: Resultsmentioning

confidence: 99%

Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

Liu

Zhou²,

Peng³

2020

J of Applied Polymer Sci

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“…The polar fractions of asphalt binder—asphaltenes and resins—account for its elastic behavior, while the non-polar fractions—saturates and aromatics—are responsible for its viscous behavior [ 20 , 21 ]. Due to differences in polarity, asphaltenes particles may agglomerate and become unstable in the surrounding matrix of the remaining fractions [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Two general methods of altering asphaltenes content in asphalt binders have been identified in the literature. The first is to use a mechanical stirrer to mix the asphalt binder with materials rich in asphaltenes [ 24 , 25 ], while the second is to add the asphaltenes separated from the asphalt binder, by n-heptane extraction, back into the binder [ 20 , 26 ]. The second method has the advantage of the asphaltenes content being adjustable, which has made this procedure more popular and has led to the emergence of the concept of artificial bitumen [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the addition of asphaltenes could improve the resistance of asphalt binders against aging [ 8 ]. Furthermore, it has been shown that it is the asphaltenes content that is primarily responsible for the elastic component of an asphalt binder’s viscoelastic response [ 20 , 26 , 28 ]. Higher asphaltenes content causes the asphalt stiffness to increase, which in return decreases the penetration and creep compliance [ 20 , 24 ], and increases the binder’s viscosity [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it has been shown that it is the asphaltenes content that is primarily responsible for the elastic component of an asphalt binder’s viscoelastic response [ 20 , 26 , 28 ]. Higher asphaltenes content causes the asphalt stiffness to increase, which in return decreases the penetration and creep compliance [ 20 , 24 ], and increases the binder’s viscosity [ 18 ]. The abrupt change in asphalt binder properties resulting from the addition of asphaltenes is indicative of a fortifying of the network formed by the polar fractions (mainly asphaltenes) within the asphalt binder; a phenomenon which gives elastic characteristics to the binder [ 26 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Performance Evaluation of Asphaltenes-Modified Asphalt Binders

2020

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Asphalt binder comprises four main fractions—asphaltenes (A), saturates (S), aromatics (A), and resins (R)—referred to as “SARA”. Asphaltenes plays an important role in determining the linear viscoelastic behavior of asphalt binders. In this research, asphaltenes are added as a distinct modifier to improve the performance properties of asphalt binder. The modified binders are aged using a rolling thin film oven. A dynamic shear rheometer is then used to measure the rheological properties of the binders at high temperatures. Changes in the chemical composition of the modified binders are also studied through the determination of SARA fractions, using precipitation and gravity-driven chromatography methods. The rheological results show that asphaltenes improve the stiffness and elasticity of asphalt binder. It is also shown that the addition of asphaltenes raises the high Performance grade (PG) temperature of the asphalt binder, with every 6% of asphaltenes added resulting in a one-interval increase in high PG temperature grade. SARA analysis shows that the increase in polar fraction content due to the addition of asphaltenes causes the stiffness, elasticity, and viscosity of asphalt binders to increase. The results indicate that asphaltenes are an effective yet inexpensive additive to improve asphalt binder properties at high temperatures.

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Use of Polymer Nanocomposites in Asphalt Binder Modification

Gulzar

Underwood

2019

Advanced Functional Textiles and Polymers

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Effect of SARA on Rheological Properties of Asphalt Binders

Cited by 50 publications

References 20 publications

Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

High-Temperature Performance Evaluation of Asphaltenes-Modified Asphalt Binders

Use of Polymer Nanocomposites in Asphalt Binder Modification

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