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    Volume 49, Issue 6 (February 2021)

    Evaluation of the Role of Reclaimed Asphalt Pavement Preheating on Cracking Behavior of Hot Mix Asphalt Recycled Mixtures by Digital Image Analysis

    (Received 29 July 2020; accepted 22 October 2020)

    Published Online: 03 February 2021

    CODEN: JTEVAB

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    Abstract

    In the last few decades, the need for reducing the exploitation of finite sources has led to an increasing use of reclaimed asphalt pavement (RAP) for the construction, maintenance, and rehabilitation of road pavements. During hot mix asphalt (HMA) plant production, RAP can be added at ambient temperature or preheated into special drums. When designing an RAP mixture, it is essential to dose the correct amount of virgin binder according to the percentage of the reactivated aged one. RAP preheating plays a key role in this process, although no reliable methods are available for achieving an accurate estimation. This article presents an innovative digital image-based methodology, named overlapped digital image (OIA) analysis, to better understand the role of reactivated binder on the cracking behavior of HMA-RAP mixtures. A recycled mixture was produced in the laboratory by adding RAP both at room temperature (25°C) and after preheating (150°C) and subsequently tested according to the Superpave IDT at 10°C and 25°C. The tests were combined with the OIA analysis to identify how the strain patterns and the initiation and propagation of fractures developed, according to the reactivation of the aged asphalt binder. The results show important outcomes in terms of cracking behaviors highlighting the important role of RAP preheating for inducing aged binder reactivation.

    Author Information:

    Roberto, Antonio
    Department of Engineering and Architecture, University of Parma, Parma,

    Król, Jan B.
    Department of Civil Engineering, Warsaw University of Technology, Warsaw,

    Romeo, Elena
    Department of Engineering and Architecture, University of Parma, Parma,

    Liphardt, Adam
    Department of Civil Engineering, Warsaw University of Technology, Warsaw,

    Tebaldi, Gabriele
    Department of Engineering and Architecture, University of Parma, Parma,

    Montepara, Antonio
    Department of Engineering and Architecture, University of Parma, Parma,


    Stock #: JTE20200465

    ISSN:0090-3973

    DOI: 10.1520/JTE20200465

    Author
    Title Evaluation of the Role of Reclaimed Asphalt Pavement Preheating on Cracking Behavior of Hot Mix Asphalt Recycled Mixtures by Digital Image Analysis
    Symposium ,
    Committee D04