Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
5.2
3.4
Journals
Materials
Special Issues
Asphalt Mixtures with Reclaimed Asphalt Pavement
materials-logo
Submit to Materials Review for Materials Propose a Special Issue

Journal Menu

► Journal Menu

Journal Browser

► Journal Browser
share announcement

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: closed (10 May 2022) | Viewed by 9299

Special Issue Editors

Dr. Ignacio Pérez Pérez

E-Mail Website
Guest Editor
Department of Civil Engineering, Universidade da Coruña, 15071 Coruña, Spain
Interests: pavement engineering
Special Issues, Collections and Topics 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 submissions that pass pre-check are 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 2600 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 (4 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

19 pages, 7216 KiB  
Article
Assessing the Asphalt Binder Film Thickness in Recycled Asphalt Mixtures Using Micro-Level Techniques
by Fazli Karim and Jawad Hussain
Materials 2021, 14(24), 7891; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14247891 - 20 Dec 2021
Cited by 5 | Viewed by 1806
Abstract
Adequate asphalt binder film thickness (ABFT) delivers skeletal integrity in recycled asphalt mixtures, resulting in long-lasting roadways when exposed to traffic and environment. The inaccurate measurement of ABFT and the consequences of not having adequate film thickness model has substantially introduced discrepancies in [...] Read more.
Adequate asphalt binder film thickness (ABFT) delivers skeletal integrity in recycled asphalt mixtures, resulting in long-lasting roadways when exposed to traffic and environment. The inaccurate measurement of ABFT and the consequences of not having adequate film thickness model has substantially introduced discrepancies in predicting actual performance of recycled asphalt mixtures. Expansion of the ultra-modern expertise and SuperPave requirements necessitate the revision of authentic ABFT at micro-level. The current study identifies the weaknesses of the current methods of estimating ABFT and provides results that are reliable and useful, using modern measurement methods. Using scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS), this study measures the ABFT around the tiniest particle of 0.2 μm magnitude, entrenched in asphalt mastic in recycled asphalt mixtures. The ABFT, obtained through image analysis, is compared with those obtained through available analytical models. The study utilizes different asphalt mixtures, containing varying proportions of recycled asphalt mixture and rejuvenators. The aggregate, virgin, and recycled binders were characterized in terms of physical and rheological properties, respectively. Marshall mix design was carried out for the conventional and recycled mixture, containing 40%, 50%, and 60% recycled materials, rejuvenated with 3%, 6%, 9%, and 12% waste engine oil (WEO) at a mixing temperature of 160 °C, based on viscosity of the virgin and rejuvenated binder. ABFT was assessed through analytical models and image analysis for the aforesaid recycled asphalt mixtures, prepared at optimum binder and rejuvenator content as per protocol outlined in ASTM D1559. The analytical estimation of ABFT, in the aforesaid recycled asphalt mixtures, revealed that the ABFT fluctuates from 6.4 μm to 13.7 microns, with a significant association to recycled asphalt mixture and rejuvenator content. However, the image analysis revealed that the ABFT, in the aforesaid recycled asphalt mixtures, fluctuates from 0.4 μm to 2 microns, without any association to recycled asphalt mixture or rejuvenator content. The image analysis indicated that the recycled asphalt mixtures typically comprise of mortar, happening in uneven shape, and are used to grip large aggregates. The asphalt mastic, a blend of bitumen and mineral filler, was found to be an interlocking agent, used to grasp only fine particles in asphalt mortar. The asphalt binder film was discovered to be a deviating stand-alone entity that only exists around the mineral fillers in the asphalt mastic as a non-absorbed binder, occupying an imprecise space of 0.4 μm to 2 microns, among the filler particles. The current findings will be useful to design asphalt pavements through the aforesaid precise limit of SEM-based ABFT rather than traditionally measured ABFT to predict the actual performance of recycled asphalt mixtures. Full article
(This article belongs to the Special Issue Asphalt Mixtures with Reclaimed Asphalt Pavement)
►▼ Show Figures

Graphical abstract

21 pages, 2892 KiB  
Article
Effects of Waste Frying Oil and Crumb Rubber on the Characteristics of a Reclaimed Asphalt Pavement Binder
by Munder Bilema, Mohamad Yusri Aman, Norhidayah Abdul Hassan, Zaid Al-Saffar, Nuha S. Mashaan, Zubair Ahmed Memon, Abdalrhman Milad and Nur Izzi Md Yusoff
Materials 2021, 14(13), 3482; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14133482 - 23 Jun 2021
Cited by 18 | Viewed by 2319
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)
►▼ Show Figures

Figure 1

18 pages, 2060 KiB  
Article
Mechanical Performance of Reclaimed Asphalt Pavement Modified with Waste Frying Oil and Crumb Rubber
by Munder Bilema, Mohamad Yusri Aman, Norhidayah Abdul Hassan, Zubair Ahmed Memon, Hend Ali Omar, Nur Izzi Md Yusoff and Abdalrhman Milad
Materials 2021, 14(11), 2781; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14112781 - 24 May 2021
Cited by 14 | Viewed by 2275
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)
►▼ Show Figures

Figure 1

15 pages, 5686 KiB  
Article
Influence of the Compaction Method in the Volumetric Design of Cold Recycled Mixtures with Emulsion
by Guillermo Flores, Juan Gallego, Lucía Miranda and José Ramón Marcobal
Materials 2021, 14(5), 1309; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14051309 - 09 Mar 2021
Cited by 3 | Viewed by 1802
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)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-4
Back to TopTop