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Zhang Jizhe – One of the best experts on this subject based on the ideXlab platform.

  • Effect of different viscous rejuvenators on chemical and mechanical behavior of Aged and recovered bitumen from RAP
    'Elsevier BV', 2020
    Co-Authors: Zhang Jizhe, Su Changju, Li Peizhao, Jiang Hongguang, Liang Ming, Yao Zhanyong, Zhang Xiaomeng, Airey Gordo

    Abstract:

    © 2019 Elsevier Ltd Due to scarcity of virgin natural materials, the use of reclaimed asphalt pavement (RAP) has been promoted and encourAged in 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 properties of the RAP by adding proper rejuvenators. 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 viscosity level of rejuvenator has different impacts on tensile elongation at break, brittle fracture stress, adhesion property and moisture resistance of rejuvenated Binders, in which the rejuvenator with an optimal viscosity may obtain the best rejuvenating performance

  • Influence of different rejuvenating agents on rheological behavior and dynamic response of recycled asphalt mixtures incorporating 60% RAP dosage
    Construction and Building Materials, 2020
    Co-Authors: Zhang Jizhe, Liang Ming, Hongguang Jiang, Xiaomeng Zhang, Jincheng Wei, Zhanyong Yao

    Abstract:

    Abstract Utilizing reclaimed asphalt pavement (RAP) to produce recycled asphalt mixture is gaining great interests due to landfill space reduction and saving of natural resources. This study investigated the influence of different rejuvenators on rheological behavior of the Aged Binder and dynamic response of recycled asphalt mixtures incorporating 60% RAP dosage. The frequency sweep test and steady state shear test were performed by Dynamic Shear Rheometer (DSR) to characterize the rheological behavior of different rejuvenated Binders. Dynamic response behaviors of recycling asphalt mixtures, including dynamic modulus, phase angle, fatigue, were evaluated by using Simple Performance Test (SPT) and Four-Point Bending Test (4 PB). Analysis on the experimental results showed that the rheological behavior of the Aged Binder can be restored by incorporating appropriate rejuvenating agents, such as vegetable oil and composite rejuvenator. The three-point bending test revealed that the viscosity level was an important factor to influence the cracking resistance of recycled asphalt mixtures containing high RAP dosage. Due to a high RAP dosage, the dynamic modulus of recycled asphalt mixture was increased while the fatigue life was reduced. The incorporation of rejuvenating agents can restore the visco-elastic behavior of recycled asphalt mixtures, but it was difficult to recover the dynamic modulus and fatigue life to similar level as that of the new asphalt mixture. Among the four rejuvenating agents used in this research, the composite rejuvenator obtained the best overall performance.

  • Effect of different viscous rejuvenators on chemical and mechanical behavior of Aged and recovered bitumen from RAP
    Construction and Building Materials, 2020
    Co-Authors: Zhang Jizhe, Li Peizhao, Liang Ming, Zhanyong Yao, Hongguang Jiang, Xiaomeng Zhang, Sun Changjun, Gordon Airey

    Abstract:

    Abstract Due to scarcity of virgin natural materials, the use of reclaimed asphalt pavement (RAP) has been promoted and encourAged in 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 properties of the RAP by adding proper rejuvenators. 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 viscosity level of rejuvenator has different impacts on tensile elongation at break, brittle fracture stress, adhesion property and moisture resistance of rejuvenated Binders, in which the rejuvenator with an optimal viscosity may obtain the best rejuvenating performance.

Alexander J. Austerman – One of the best experts on this subject based on the ideXlab platform.

  • A Mechanical Approach to Quantify Blending of Aged Binder from Recycled Materials in New Hot Mix Asphalt Mixtures
    Transportation Research Record, 2018
    Co-Authors: Milad Zokaei Ashtiani, Walaa S Mogawer, Alexander J. Austerman

    Abstract:

    In the paving industry, there is increased interest in using recycled materials like recycled asphalt shingles (RAS) and reclaimed asphalt pavements (RAP) due to the valuable asphalt Binder contained within them. The major concern with using these materials is that the Binder they contain is highly Aged, which could lead to reduced mixture durability. Therefore, a method is needed to quantify the extent to which the Aged Binders from these materials blend with virgin Binder when producing mixtures in order to understand better their effects on mixture performance.In this study, a new approach to quantify the amount of blending that occurs between Aged RAS and RAP Binders and a virgin Binder was developed. Asphalt Binders were extracted and recovered from RAS and RAP stockpiles and blended with a PG64-28 virgin Binder in varying proportions. The master curves of these mixtures were constructed at 20°C. Asphalt mixtures containing different proportions of the same RAS and RAP stockpiles were then designed a…

  • a mechanical approach to quantify blending of Aged Binder from recycled materials in new hot mix asphalt mixtures
    Transportation Research Record, 2018
    Co-Authors: Milad Zokaei Ashtiani, Walaa S Mogawer, Alexander J. Austerman

    Abstract:

    In the paving industry, there is increased interest in using recycled materials like recycled asphalt shingles (RAS) and reclaimed asphalt pavements (RAP) due to the valuable asphalt Binder contain…

  • ageing and rejuvenators evaluating their impact on high rap mixtures fatigue cracking characteristics using advanced mechanistic models and testing methods
    Road Materials and Pavement Design, 2015
    Co-Authors: Walaa S Mogawer, Alexander J. Austerman, Reynaldo Roque, Shane Underwood, Louay N Mohammad

    Abstract:

    Fatigue cracking of asphalt mixtures is highly dependent on ageing. Using larger amounts of reclaimed asphalt pavement (RAP) presents a concern that the resultant mixtures may be prone to fatigue cracking because of the Aged Binder in the RAP. Several studies have indicated that asphalt rejuvenators can allow more Aged Binder to be incorporated into asphalt mixtures. The four-point flexural beam fatigue test, HMA (hot-mix asphalt) fracture mechanics model, simplified viscoelastic continuum damage model, and the semi-circular bending test were used to evaluate the effect of ageing on the fatigue characteristics of high RAP mixtures modified with rejuvenators. The results from these tests were compared to see if they provided similar performance trends. The results indicated that the long-term ageing used in this study did not have a significant effect on the fatigue characteristics of the high RAP mixture with and without rejuvenators. Comparison of the fatigue tests did not show universal agreement.

Zhanyong Yao – One of the best experts on this subject based on the ideXlab platform.

  • Effect of different viscous rejuvenators on chemical and mechanical behavior of Aged and recovered bitumen from RAP
    Construction and Building Materials, 2020
    Co-Authors: Zhang Jizhe, Li Peizhao, Liang Ming, Zhanyong Yao, Hongguang Jiang, Xiaomeng Zhang, Sun Changjun, Gordon Airey

    Abstract:

    Abstract Due to scarcity of virgin natural materials, the use of reclaimed asphalt pavement (RAP) has been promoted and encourAged in 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 properties of the RAP by adding proper rejuvenators. 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 viscosity level of rejuvenator has different impacts on tensile elongation at break, brittle fracture stress, adhesion property and moisture resistance of rejuvenated Binders, in which the rejuvenator with an optimal viscosity may obtain the best rejuvenating performance.

  • Influence of different rejuvenating agents on rheological behavior and dynamic response of recycled asphalt mixtures incorporating 60% RAP dosage
    Construction and Building Materials, 2020
    Co-Authors: Zhang Jizhe, Liang Ming, Hongguang Jiang, Xiaomeng Zhang, Jincheng Wei, Zhanyong Yao

    Abstract:

    Abstract Utilizing reclaimed asphalt pavement (RAP) to produce recycled asphalt mixture is gaining great interests due to landfill space reduction and saving of natural resources. This study investigated the influence of different rejuvenators on rheological behavior of the Aged Binder and dynamic response of recycled asphalt mixtures incorporating 60% RAP dosage. The frequency sweep test and steady state shear test were performed by Dynamic Shear Rheometer (DSR) to characterize the rheological behavior of different rejuvenated Binders. Dynamic response behaviors of recycling asphalt mixtures, including dynamic modulus, phase angle, fatigue, were evaluated by using Simple Performance Test (SPT) and Four-Point Bending Test (4 PB). Analysis on the experimental results showed that the rheological behavior of the Aged Binder can be restored by incorporating appropriate rejuvenating agents, such as vegetable oil and composite rejuvenator. The three-point bending test revealed that the viscosity level was an important factor to influence the cracking resistance of recycled asphalt mixtures containing high RAP dosage. Due to a high RAP dosage, the dynamic modulus of recycled asphalt mixture was increased while the fatigue life was reduced. The incorporation of rejuvenating agents can restore the visco-elastic behavior of recycled asphalt mixtures, but it was difficult to recover the dynamic modulus and fatigue life to similar level as that of the new asphalt mixture. Among the four rejuvenating agents used in this research, the composite rejuvenator obtained the best overall performance.

  • Experimental assessment of reclaimed bitumen and RAP asphalt mixtures incorporating a developed rejuvenator
    Construction and Building Materials, 2019
    Co-Authors: Zhang Jizhe, Liang Ming, Sun Hui, Hongguang Jiang, Yong Hou, Zhanyong Yao

    Abstract:

    Abstract Recycling and reuse of reclaimed asphalt pavement (RAP) in recycled asphalt mixtures is now gaining great interests for sustainability-driven and cost-effective development of asphalt pavements. However, the properties of recycled asphalt mixtures prepared with RAP would be determined by using a suitable rejuvenator to restore original properties of Aged (oxidized) bitumen in the RAP. This study investigated the properties of rejuvenated bitumen recovered from RAP as well as the properties of recycled asphalt mixtures prepared with a developed rejuvenator. The properties of the rejuvenated bitumen were evaluated by the SARA (saturates, aromatics, resins and asphaltenes) method, softening point and penetration tests, and the properties of recycled asphalt mixtures prepared with different contents of RAP were determined by wheel tracking, three-point bending (3 PB) and four-point bending (4 PB) tests. Analysis on the conventional properties of the rejuvenated Binder showed that the developed rejuvenator can restore the colloidal structure and rheological properties of the Aged Binder. The incorporation of rejuvenator in recycled asphalt mixtures can decrease the dynamic stability of recycled mixtures, and the maximum bending strain of recycled asphalt mixtures can be increased due to the rheological recovery of the Aged Binder in the RAP. The fatigue behavior of recycled asphalt mixtures incorporated with the developed rejuvenator was improved as well. Compared to the selected commercial rejuvenator, using the developed rejuvenator can improve more pavement performance of recycled asphalt mixtures.