Aging effect on rheology and cracking behaviour of reclaimed binder with bio-based rejuvenators

Cavalli, Maria Chiara; Zaumanis, Mārtiņš; Mazza, Edoardo; Partl, Manfred N.; Poulikakos, Lily D.

doi:10.1016/j.jclepro.2018.03.305

Cited by 97 publications

(24 citation statements)

References 35 publications

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“…The rejuvenator content was fixed at 5.0% by weight of aged binder. This content was selected in accordance with the experience in previous research works [35]. It is important to note that the recycled CR and PmB modified mixtures were prepared following the same preparation protocol used for the original mixtures.…”

Section: Asphalt Mixture Preparation and Aging Proceduresmentioning

confidence: 99%

“…Then, the recovered samples were evaluated by means of rheological tests. In particular, complex modulus and phase angle for different test temperatures and frequencies (master curve) were determined [35]. This test was performed following the standard (EN 14770) and using a dynamic shear rheometer (DSR) Physica MCR 301 from Anton Paar (Graz, Austria).…”

Section: Characterization Testsmentioning

confidence: 99%

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Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

et al. 2020

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Semi-Dense Asphalt (SDA) mixtures are nowadays recommended for the surface layer of low noise roads in urban areas due to their optimal functional characteristics. Moreover, the use of polymer-modified bitumen (PmB) in its design results in high mechanical performance. However, this type of highly modified bitumen implies significant economic and environmental disadvantages. The polymer modification increases the production cost, involves higher mixing temperatures, and makes the recycling process of the asphalt mixtures challenging. As a potential alternative to PmB in SDA mixtures, this experimental work analyses the dry process for the incorporation of crumb rubber (CR) from waste tires. Particularly, the main objective was to study the aging effect and the recyclability of asphalt mixtures prepared in the laboratory with two different types of CR. The volumetric properties and mechanical performance of the mixtures artificially aged and rejuvenated were evaluated. The results obtained show that mixtures with CR have adequate performance, being less susceptible to aging than a conventional polymer-modified mixture. Furthermore, the rheological response of asphalt binder samples recovered from the mixtures at different aging states was analyzed. It was observed that the effect of the rejuvenator depended on the CR type, but this fact did not negatively influence the performance of the recycled mixtures.

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Section: Asphalt Mixture Preparation and Aging Proceduresmentioning

confidence: 99%

Section: Characterization Testsmentioning

confidence: 99%

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

et al. 2020

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“…The work presented in this paper is part of a large-scale national project where the mechanical performance of rejuvenated high RAP mixtures were studied from micro scale to full-scale plant production (Cavalli et al, 2018a(Cavalli et al, , 2018b(Cavalli et al, , 2019Zaumanis, Arraigada, et al, 2019;Zaumanis, Boesiger, et al, 2019;Zaumanis et al, 2018.…”

Section: Introductionmentioning

confidence: 99%

Environmental impact of rejuvenators in asphalt mixtures containing high reclaimed asphalt content

Muñoz

Haag

Figi

et al. 2021

Road Materials and Pavement Design

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The use of reclaimed asphalt pavement (RAP) is of increasing importance due to fast-growing amounts of demolished road materials. However, reclaimed asphalt can contain relevant amounts of pollutants such as carcinogenic polycyclic aromatic hydrocarbons (PAHs) and toxic metals. In order to improve the mechanical properties of recycled asphalt, rejuvenators are used to reduce the stiffness of the aged binder. These rejuvenators in turn may potentially mobilise pollutants like PAHs and facilitate their leaching to surface and ground waters. The environmental impact of three rejuvenators with good mechanical performance was studied. The environmental impact was assessed by determining metal-and PAH contents in the RAP and in leachates. Chemical analyses showed that rejuvenators did not mobilise PAHs from RAP materials for 2-3 ring PAHs. However, some 4-6 ring PAHs that are relatively less toxic indeed leached more easily from unaged material. Ageing reduced the tendency for PAH leaching, without and with rejuvenator.

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“…Finally, the aged binder results in reduction in the aromatics content and an increase in the resin and asphaltenes content, in which the saturates content approximately remains unchanged [18]. With respect to the mechanical point of view, the ageing effect increases the binder viscosity as a result of the increases of polar components, especially asphaltenes [19] [20]. In addition, variations in polar fractions of bitumen are also responsible for the increment of complex shear modulus at low frequency/high temperatures [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of different viscous rejuvenators on chemical and mechanical behavior of aged and recovered bitumen from RAP

Zhang

Sun

et al. 2020

Construction and Building Materials

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Due to scarcity of virgin natural materials, the use of reclaimed asphalt pavement (RAP) has been promoted and encouraged in the pavement engineering. However, note that the bituminous binder in RAP has been seriously aged due to long-term service exposure to the atmosphere. It is thus paramount to effectively restore the properties of RAP by adding a proper rejuvenator. In this study, five rejuvenators were designed with different viscosities and applied to rejuvenate the aged binder. The changes in chemical compositions of bitumen caused by ageing and rejuvenating were evaluated by a SARA (Saturate, Aromatic, Resin and Asphaltene) analysis method. Brookfield viscosity, Dynamic Shear Rheometer (DSR) and Direct Tension (DT) were further conducted to evaluate the physical and mechanical properties of bituminous binders. Surface Free Energy test was applied to characterize the adhesion and moisture damage behavior of aged and rejuvenated binders. The experimental results showed that the ageing process increased resins and asphaltenes, which in turn improved the colloidal stability of the aged binder.The five rejuvenators designed in this research had a similar effect in restoring the rheological properties and stiffness of the aged bitumen to a similar level as that of the virgin binder. However, the rejuvenator viscosity had different impacts on tensile elongation at break, brittle fracture stress, adhesion property and moisture resistance of the rejuvenated binders, in which the rejuvenator with an optimal viscosity may obtain the best rejuvenating performance.

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Aging effect on rheology and cracking behaviour of reclaimed binder with bio-based rejuvenators

Cited by 97 publications

References 35 publications

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

Environmental impact of rejuvenators in asphalt mixtures containing high reclaimed asphalt content

Effect of different viscous rejuvenators on chemical and mechanical behavior of aged and recovered bitumen from RAP

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