Understanding effects of RAP on rheological performance and chemical composition of SBS modified binder using series of laboratory tests

Singh, Dharamveer; Sawant, Dheeraj

doi:10.1016/j.ijprt.2016.06.002

Cited by 50 publications

(12 citation statements)

References 12 publications

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“…When high deformations were applied, it was observed that aging negatively affected the fatigue life of the material. However, at low levels of deformation (up to 10%), it was found in this study as well as in other studies [ 57 , 58 , 59 ] that aging can be beneficial for the fatigue life of asphalt binders. Therefore, the prediction of pavement fatigue performance based on LAS results should be done cautiously, given that the study of Bennert and Maher [ 60 ] observed the fatigue behavior obtained through the LAS test was not in accordance with the fatigue cracking observed in the field.…”

Section: Resultssupporting

confidence: 70%

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Effect of Thermal and Oxidative Aging on Asphalt Binders Rheology and Chemical Composition

et al. 2020

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Aging of asphalt binders is one of the main causes of its hardening, which negatively affects the cracking and fatigue resistance of asphalt binders. Understanding asphalt aging is crucial to improve the durability of asphalt pavements. In this regard, this study aims at understanding and differentiating the effect of temperature and oxygen uptake on the aging mechanisms of unmodified asphalt binders. For that, four laboratory aging procedures were employed. The two standardized procedures, rolling thin-film oven test (RTFOT) and pressure aging vessel (PAV), were considered to simulate the short-term and long-term aging of the asphalt binders, respectively. In addition, two thin-film aging test procedures, the nitrogen atmosphere oven aging test (NAAT) and ambient atmosphere oven aging test (OAAT) were employed to assess the effect of thermal and oxidative aging on unmodified asphalt binder properties. The NAAT procedure is based on the principle that the inert gas minimizes the oxidative aging. The rheological and chemical characterization showed that the high temperatures considered during the NAAT procedure did not change the properties of the unmodified asphalt binders. Therefore, it can be hypothesized that no significant thermal and oxidative aging was observed during NAAT aging procedure for the considered binders and that oxidative aging is the main cause for the hardening.

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Section: Resultssupporting

confidence: 70%

“…The higher stiffness of binder A when compared to binder B, especially after PAV aging procedure, should not be solely correlated to their asphaltene content [ 58 , 72 ]. Instead, the asphalt binder stiffness must be assessed from the total sum of the resins and asphaltenes fractions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Thermal and Oxidative Aging on Asphalt Binders Rheology and Chemical Composition

et al. 2020

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“…The BBR test introduces parameters for calculating the binding resistance to low-temperature cracking: m-value and S (creep stiffness). [50] noted a rise in the SBS PMA binder stiffness (PG 76-xx), with a decrease in the m-value of both RAP origins. These findings showed the low-temperature efficiency of PMA binders was negatively impacted by the recovered RAP binder.…”

Section: Binder Properties Related To Thermal Crackingmentioning

confidence: 96%

“…Initial studies based on BBR test results have shown that PMAs with reclaimed RAP binders usually exhibited decreased resistance against cracking at low temperatures compared to PMA binder control [42,50,53].…”

Section: Binder Properties Related To Thermal Crackingmentioning

confidence: 99%

Characterization of Reclaimed Asphalt Pavement and Optimization in Polymer Modified Asphalt Blends: A Review

Tiza¹

2021

CEBEL

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This study reviews relevant literature on the characterization of reclaimed asphalt pavement (RAP) and its interaction with polymer modified asphalt(PMA). The study on fatigue cracking indicates that several indexes of binder performance usually decreased the tolerance to cracking of the Polymer Modified Asphalt (PMA). In another perspective, RAP binding rigidity affects the PMA binder tolerance to fatigue. The greater the rigidity of the RAP binder, the more fatigue strength the binders would provide. In addition, several researchers have demonstrated that the quality of RAP binder decreased the elastomeric response worth. It was generally found that the RAP binder effect on the PMA binder is similar to the unmodified binder effect. The resistance to rutting in the PMA binder improves and at the same time, fatigue cracking and thermal cracking are adequately minimized. Moreover, several researchers have shown that the inclusion of a RAP lowers elastomeric efficiency. In summary, RAP binding stiffness and gradation are essential features for PMA-mix designs. The review further illustrates that during the process of RAP binder characterization, the mortar testing process without the use of binder extraction is more effective than the conventional method. Also, the best measure for the evaluation of the fatigue cracking efficiency of RAP containing PMA blends does not seem to have gained any consensus among researchers as several researchers seem to have varying conclusions. Literature on Life Cycle Analysis of RAP has also been reviewed and presented.

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“…Only limited information, based on results of binder tests, has been reported in relation to the effect of RAP binder stiffness on PMA mixture cracking performance. Several researchers have reported that inclusion of RAP binder has a negative influence on PMA binder cracking resistance (12)(13)(14)(15). Furthermore, the higher the stiffness of RAP binder, the greater the effect of RAP binder on cracking resistance of PMA binder (13,14,16).…”

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confidence: 99%

Approach for Determination of Maximum Reclaimed Asphalt Pavement Content in Polymer-Modified Asphalt Mixture

Park

Zou

Roque

et al. 2020

Transportation Research Record: Journal of the Transportation R

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Reclaimed asphalt pavement (RAP), commonly generated from the millings of damaged roads, contains recyclable asphalt and aggregate. Polymer-modified asphalt (PMA) binders have had proven success in mitigating rutting and cracking in asphalt pavements. However, benefits associated with PMA binder may be reduced by aged and more brittle RAP binder. Currently, the maximum usage of RAP in PMA mixture is limited to 10–20% by several Departments of Transportation in the United States. Other than maximum RAP content, no criterion related to RAP characteristics is used to limit RAP usage in PMA mixture. Recent studies showed RAP binder stiffness and RAP aggregate gradation appeared to be important characteristics related to cracking performance of PMA mixture containing RAP. Therefore, this research focused on determining maximum allowable RAP content in PMA mixture for individual RAP sources based on key RAP characteristics identified, that is, RAP stiffness and RAP fineness. Interstitial component direct tension (ICDT) test was conducted to determine fracture energy for interstitial component (i.e., the fine portion of PMA mixture containing RAP), which is known to be correlated well with the fracture energy of the corresponding mixture. Results showed introduction of coarser and less stiff RAP generally resulted in greater fracture energy, which allowed up to 40% RAP usage in PMA mixture. Integration of key RAP characteristics identified and the results of ICDT test provide a systematic approach for determination of maximum RAP content in PMA mixtures. Further research is recommended to evaluate additional RAP sources to verify the proposed approach.

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Understanding effects of RAP on rheological performance and chemical composition of SBS modified binder using series of laboratory tests

Cited by 50 publications

References 12 publications

Effect of Thermal and Oxidative Aging on Asphalt Binders Rheology and Chemical Composition

Effect of Thermal and Oxidative Aging on Asphalt Binders Rheology and Chemical Composition

Characterization of Reclaimed Asphalt Pavement and Optimization in Polymer Modified Asphalt Blends: A Review

Approach for Determination of Maximum Reclaimed Asphalt Pavement Content in Polymer-Modified Asphalt Mixture

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