Journal Published Online: 03 February 2021
Volume 49, Issue 6

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

CODEN: JTEVAB

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, Italy
Król, Jan B.
Department of Civil Engineering, Warsaw University of Technology, Warsaw, Poland
Romeo, Elena
Department of Engineering and Architecture, University of Parma, Parma, Italy
Liphardt, Adam
Department of Civil Engineering, Warsaw University of Technology, Warsaw, Poland
Tebaldi, Gabriele
Department of Engineering and Architecture, University of Parma, Parma, Italy
Montepara, Antonio
Department of Engineering and Architecture, University of Parma, Parma, Italy
Pages: 13
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20200465
ISSN: 0090-3973
DOI: 10.1520/JTE20200465