Special Issue "Asphalt Mixtures with Reclaimed Asphalt Pavement"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: 5 November 2021.

Special Issue Editors

Dr. Ignacio Pérez Pérez
E-Mail Website
Guest Editor
Department of Civil Engineering, Universidade da Coruña, A Coruña, Spain
Interests: pavement engineering
Special Issues and Collections in MDPI journals
Dr. Ana R. Pasandín
E-Mail Website
Guest Editor
Department of Civil Engineering, Universidade da Coruña, A Coruña, Spain
Interests: pavements; reclaimed asphalt pavement; mechanical properties; recycled materials; recycling; sustainability

Special Issue Information

Dear Colleagues,

This Special Issue, “Asphalt Mixtures with Reclaimed Asphalt Pavement”, will address advances in materials design, processing, characterization, testing, mechanical properties, technology development, and implementation of several types of asphalt mixtures with a reclaimed asphalt pavement.

Asphalt mixtures are the most commonly used materials in highway pavements. Asphalt mixtures are complex materials principally composed of aggregates and asphalt. From an environmental point of view, the consumption of aggregates and bitumen as raw and non-renewable resources is one of the main concerns in pavement engineering. Hence, the recycling technology of reclaimed asphalt pavement was developed and applied for road rehabilitation.

In this context, in the rehabilitation of pavement asphalt mixtures, the reuse of reclaimed asphalt pavement (RAP) varies from 10% to 90% content depending on mixture designs (up to 100% in cold mix designs). In addition, according to the mixing temperature, there are different types of asphalt mixtures made with RAP such as hot mixtures, cold mixtures, warm mixtures, and half-warm mixtures. In addition, these mixtures include in-place or central plant processing.

The topics of interest include but are not limited to:

  • Hot central plant recycling
  • Hot-in place recycling
  • Cold central plant recycling
  • Cold-in place recycling
  • Warm central plant recycling
  • Half-warm central plant recycling

It is our pleasure to invite you to submit research articles and review papers on novel, sustainable recycling methods for the pavement asphalt mixtures mentioned above, including papers on the life cycle assessment of these mixtures.

Dr. Ignacio Pérez Pérez
Dr. Ana R. Pasandín
 Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Pavement engineering
  • Asphalt mixtures
  • Reclaimed asphalt pavement (RAP)
  • Mechanical properties
  • Recycled materials
  • Sustainability
  • Recycling

Published Papers (3 papers)

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Research

Article
Effects of Waste Frying Oil and Crumb Rubber on the Characteristics of a Reclaimed Asphalt Pavement Binder
Materials 2021, 14(13), 3482; https://doi.org/10.3390/ma14133482 - 23 Jun 2021
Cited by 1 | Viewed by 493
Abstract
The reclaimed asphalt pavement (RAP) has become a moderately common practice in most countries; Hence, rejuvenating materials with RAP have earned publicity in the asphalt manufacturers, mainly due to the increasing raw material costs. In this study, the crumb rubber (CR) and waste [...] Read more.
The reclaimed asphalt pavement (RAP) has become a moderately common practice in most countries; Hence, rejuvenating materials with RAP have earned publicity in the asphalt manufacturers, mainly due to the increasing raw material costs. In this study, the crumb rubber (CR) and waste frying oil (WFO) utilized as waste materials to restore the properties and enhance the rutting resistance of the RAP. Several physical, rheological, chemical properties of bituminous binders were tested. The result showed that the RAP bituminous binders incorporating WFO and CR decreased softening points and the increased penetration value; these translate to an increase in penetration index. Moreover, the viscosity of the WFO/CR combination reclaimed asphalt pavement binder showed better workability and stiffness, as well as a low storage stability temperature (less than 2.2 °C) with an acceptable loss upon heating. Without chemical reaction was observed between the waste-frying oil with the rubberized binder and the reclaimed asphalt pavement binder. Additionally, the WFO/CR rheological properties combined with the reclaimed asphalt pavement binder were comparable to the control sample. The incorporation of CR with WFO as a hybrid rejuvenator enhanced the rutting resistance. Therefore, the presence of WFO/CR has a considerable influence on the RAP binder properties while preserving a better environment and reducing pollution by reusing waste materials. Full article
(This article belongs to the Special Issue Asphalt Mixtures with Reclaimed Asphalt Pavement)
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Article
Mechanical Performance of Reclaimed Asphalt Pavement Modified with Waste Frying Oil and Crumb Rubber
Materials 2021, 14(11), 2781; https://doi.org/10.3390/ma14112781 - 24 May 2021
Cited by 2 | Viewed by 584
Abstract
Researchers are exploring the utilisation of reclaimed asphalt pavement (RAP) as a recycled material to determine the performance of non-renewable natural aggregates and other road products such as asphalt binder, in the construction and rehabilitation stage of asphalt pavements. The addition of RAP [...] Read more.
Researchers are exploring the utilisation of reclaimed asphalt pavement (RAP) as a recycled material to determine the performance of non-renewable natural aggregates and other road products such as asphalt binder, in the construction and rehabilitation stage of asphalt pavements. The addition of RAP in asphalt mixtures is a complex process and there is a need to understand the design of the asphalt mixture. Some of the problems associated with adding RAP to asphalt mixtures are moisture damage and cracking damage caused by poor adhesion between the aggregates and asphalt binder. There is a need to add rejuvenators to the recycled mixture containing RAP to enhance its performance, excepting the rutting resistance. This study sought to improve asphalt mixture performance and mechanism by adding waste frying oil (WFO) and crumb rubber (CR) to 25 and 40% of the RAP content. Moreover, the utilisation of CR and WFO improved pavement sustainability and rutting performance. In addition, this study prepared five asphalt mixture samples and compared their stiffness, moisture damage and rutting resistance with the virgin asphalt. The results showed enhanced stiffness and rutting resistance of the RAP but lower moisture resistance. The addition of WFO and CR restored the RAP properties and produced rutting resistance, moisture damage and stiffness, which were comparable to the virgin asphalt mixture. All waste and virgin materials produce homogeneous asphalt mixtures, which influence the asphalt mixture performance. The addition of a high amount of WFO and a small amount of CR enhanced pavement sustainability and rutting performance. Full article
(This article belongs to the Special Issue Asphalt Mixtures with Reclaimed Asphalt Pavement)
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Article
Influence of the Compaction Method in the Volumetric Design of Cold Recycled Mixtures with Emulsion
Materials 2021, 14(5), 1309; https://doi.org/10.3390/ma14051309 - 09 Mar 2021
Viewed by 514
Abstract
Compaction of cold asphalt mixtures is a subject that has not been thoroughly studied, and, for this reason, requires new efforts from researchers to have a better understanding. Unlike hot mixtures, cold mixtures and mainly recycled mixtures require specific considerations for compaction. There [...] Read more.
Compaction of cold asphalt mixtures is a subject that has not been thoroughly studied, and, for this reason, requires new efforts from researchers to have a better understanding. Unlike hot mixtures, cold mixtures and mainly recycled mixtures require specific considerations for compaction. There is a lack of consensus about the methodology to select the optimum premix water and emulsion contents. In the absence of specific regulations, the use of soil tests or hot mixtures procedures is common. For these reasons, this investigation’s main goal was to evaluate two compaction methods used to design cold recycled mixtures with emulsion: the modified Proctor procedure and the gyratory compaction. It was concluded that both methods could be useful to study compactability since consistent results were obtained by applying the maximum bulk density criterion. However, the higher bulk densities achieved, the smaller specimens used, and the suitability of the gyratory specimens to be later tested for mechanical properties make them preferable to the modified Proctor samples. A new approach has been proposed using iso-density lines on dual-axis premix water content-emulsion content graphs that facilitates the study of the influence on compactability of these two factors combined. These contributions can alleviate the laboratory works during the design of cold recycled asphalt mixtures and contribute to a more in-depth knowledge of the combined effect of premix water and emulsion contents on the compactability of cold recycled mixtures with emulsion. Full article
(This article belongs to the Special Issue Asphalt Mixtures with Reclaimed Asphalt Pavement)
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