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Evaluation of healing performance of blended reclaimed asphalt binders with rejuvenators based on rheological and chemical properties

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Abstract

The accumulation of damage due to repeated loading is considered as the primary reason for the fatigue cracking of bituminous pavements. Due to the intermittent nature of loading in the field, the bituminous mixtures tend to heal during the rest period resulting in increased fatigue life. The healing of the bituminous mixtures is predominantly governed by the binder component, and hence quantifying the healing potential of the binder is indicative of the healing potential of the mix. Currently, the increased use of recycled asphalt pavements (RAP) in new construction, as well as rehabilitation has triggered the use of rejuvenators for restoring the RAP binder properties. As such, the rheological and physico-chemical evaluation of blender RAP binders (with rejuvenators) is critical. In the present study, four different rejuvenators are used for rejuvenating the RAP binder, which include two types of Paraffinic oils, Tall oils and Fatty acids. The healing potential of the RAP binder blended with different rejuvenators is investigated with the help of Linear Amplitude Sweep (LAS) tests carried out in two ways. The first method is a continuous LAS test without any rest period and the second method incorporates rest periods of various duration at different damage levels. The advantages of incorporating rest periods in a LAS test have been quantified in terms of improved binder healing potential. In addition, the physico-chemical properties of the blended RAP binders were assessed through SARA analysis. An attempt has been made to explain the fatigue performance and healing potential of blended RAP binders in LAS tests by virtue of their chemical composition obtained from physico-chemical analysis (SARA analysis). Also, the effectiveness of various rejuvenators in improving the healing potential of RAP binders has been evaluated.

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Authors and Affiliations

  1. CSIR-Central Road Research Institute, New Delhi, 110025, India

    Ayush Gupta, Deepa Sasidharan PhD, Bharath Gottumukkala & Siksha Swaroopa Kar

Authors
  1. Ayush Gupta
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  2. Deepa Sasidharan PhD
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  3. Bharath Gottumukkala
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  4. Siksha Swaroopa Kar
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Correspondence to Deepa Sasidharan PhD.

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Gupta, A., Sasidharan, D., Gottumukkala, B. et al. Evaluation of healing performance of blended reclaimed asphalt binders with rejuvenators based on rheological and chemical properties. Sādhanā 48, 139 (2023). https://doi.org/10.1007/s12046-023-02213-0

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  • DOI: https://doi.org/10.1007/s12046-023-02213-0

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