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Recycling Pavements Materials
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Recycling Pavements Materials

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

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 7712

Special Issue Editors

Prof. Giulio Dondi

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Guest Editor
Department of Civil, Chemical, Environmental, and Materials Engineering, Alma Mater Studiorum Università di Bologna, Bologna, Italy
Interests: road pavements; geotechnics of roads; traffic vibrations; numerical modeling to distinct elements; retaining structure; alternative road materials
Dr. Claudio Lantieri

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Guest Editor
Department of Civil, Chemical, Environmental, and Materials Engineering, Alma Mater Studiorum Università di Bologna, Bologna, Italy
Interests: road maintenance; safety; road materials; skid resistance and surface characteristics of road pavement
Special Issues, Collections and Topics in MDPI journals
Dr. Ennia Mariapaola Acerra

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Guest Editor
Department of Civil, Chemical, Environmental, and Materials Engineering, Alma Mater Studiorum Università di Bologna, Bologna, Italy
Interests: road safety; retaining walls; road infrastructure
Dr. Margherita Pazzini

E-Mail Website
Guest Editor
Department of Civil, Chemical, Environmental, and Materials Engineering, Alma Mater Studiorum Università di Bologna, Bologna, Italy
Interests: sustainable mobility; road design; geotechnics of roads

Special Issue Information

Dear Colleagues,

Traffic volumes of heavy vehicles have increased as a consequence of high freight transport, worsening the deterioration of our road infrastructure. The consequent maintenance often involves the consumption of non-renewable raw materials, such as stone aggregates and bitumen, also producing large quantities of resulting materials that have a strong impact on environmental pollution. For this reason, it is important to recycle materials and to study ways to reuse them. In the EU only, the recovery material coming yearly from the demolition of the road pavements amounts to several million tons, and its reuse rate is quite low. This important Special Issue aims to define how recycled materials are reused, thus reducing emissions harmful to the environment. It also deals with how to reduce the use of virgin raw materials and the necessity of a sharp decrease in the use of landfill areas. Topics of interest include technical and functional requirements for each different layer of pavement, specific processing, as well as material acceptance and validation tests. This Special Issue presents the latest research progress in this field, also highlighting the favorable quality characteristics that these materials give to road pavements. The characteristics of bearing capacity, skid resistance, and regularity can thus be guaranteed, pursuing constant protection of the environment.

The main topics of interest are:

  • Use of modified bitumen in road pavements for road maintenance and safety;
  • Increase of RAP percentage in asphalt mixtures;
  • Use of alternative road materials (e.g., plastic road, rubber powder, Blast Furnace Slag);
  • Infrastructure design increasing the performance of pavement (e.g., use of geosynthetics);
  • Change of subgrades and foundations to develop performance;
  • New validation tests for road materials through laboratory or on-site tests;
  • Numerical simulations for the validation of road pavement characteristics;
  • Road maintenance work to improve the service life of pavements.

Prof. Giulio Dondi
Dr. Claudio Lantieri
Dr. Ennia Mariapaola Acerra
Dr. Margherita Pazzini
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

  • recycling
  • pollution
  • waste reuse
  • construction and demolition
  • milled material
  • road maintenance
  • reclaimed asphalt pavement

Published Papers (3 papers)

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Research

15 pages, 9088 KiB  
Article
Experimental Analysis of Hot-Mix Asphalt (HMA) Mixtures with Reclaimed Asphalt Pavement (RAP) in Railway Sub-Ballast
by Nicola Fiore, Salvatore Bruno, Giulia Del Serrone, Franco Iacobini, Gabriella Giorgi, Alessandro Rinaldi, Laura Moretti, Gian Marco Duranti, Paolo Peluso, Lorenzo Vita and Antonio D’Andrea
Materials 2023, 16(4), 1335; https://doi.org/10.3390/ma16041335 - 04 Feb 2023
Cited by 3 | Viewed by 1746
Abstract
Environmental safeguards promote innovative construction technologies for sustainable pavements. On these premises, this study investigated four hot mix asphalt (HMA) mixtures—i.e., A, B, C, and D—for the railway sub-ballast layer with 0%, 10%, 20%, and 30% reclaimed asphalt pavement (RAP) by total aggregate [...] Read more.
Environmental safeguards promote innovative construction technologies for sustainable pavements. On these premises, this study investigated four hot mix asphalt (HMA) mixtures—i.e., A, B, C, and D—for the railway sub-ballast layer with 0%, 10%, 20%, and 30% reclaimed asphalt pavement (RAP) by total aggregate mass and a rejuvenator additive, varying the bitumen content between 3.5% and 5.0%. Both Marshall and gyratory compactor design methods have been performed, matching the stability, indirect tensile strength, and volumetric properties of each mixture. Dynamic stiffness and fatigue resistance tests provided mechanical performances. Laboratory results highlighted that the RAP and the rejuvenator additive increase the mechanical properties of the mixtures. In addition, the comparative analysis of production costs revealed up to 20% savings as the RAP content increased, and the life cycle impact analysis (LCIA) proved a reduction of the environmental impacts (up to 2% for resource use-fossils, up to 7% for climate change, and up to 13% for water use). The experimental results confirm that HMA containing RAP has mechanical performances higher than the reference mixture with only virgin raw materials. These findings could contribute to waste management and reduce the environmental and economic costs, since the use of RAP in the sub-ballast is not, so far, provided in the Italian specifications for railway construction. Full article
(This article belongs to the Special Issue Recycling Pavements Materials)
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14 pages, 1600 KiB  
Article
Mechanical Characterization of Thin Asphalt Overlay Mixtures with 100% Recycled Aggregates
by Margherita Pazzini, Giulia Tarsi, Piergiorgio Tataranni, Claudio Lantieri and Giulio Dondi
Materials 2023, 16(1), 188; https://doi.org/10.3390/ma16010188 - 25 Dec 2022
Cited by 5 | Viewed by 1821
Abstract
Asphalt pavements inevitably deteriorate over time, requiring frequent maintenance work to ensure the proper serviceability of the road network. Small interventions, such as resurfacing for pavement preservation, are preferable to reconstruction at the end of roads’ in-service lives as they limit environmental- and [...] Read more.
Asphalt pavements inevitably deteriorate over time, requiring frequent maintenance work to ensure the proper serviceability of the road network. Small interventions, such as resurfacing for pavement preservation, are preferable to reconstruction at the end of roads’ in-service lives as they limit environmental- and economic-related impacts. Thin asphalt overlay (TAO) mixture represents a suitable maintenance solution to restore the functional properties of road surfaces. Due to the increasing awareness of the depletion of non-renewable resources and the importance of promoting the circular economy, this study evaluated the possibility of using fully recycled TAO mixes by investigating their volumetric and mechanical properties. Two eco-friendly TAO mixes were designed using recycled aggregates from reclaimed asphalt pavements, a municipal solid waste incinerator, and steel slags in order to meet EN 13108-2 requirements. The TAO mixes differed in regard to the type of bituminous binder (neat/SBS-modified bitumens) and fibres (natural/synthetic) employed. The preliminary results demonstrated that the presence of recycled aggregates did not negatively affect the workability and the mechanical performances of the two sustainable mixtures in terms of stiffness, tensile resistance, rutting and moisture susceptibility. Of these, the TAO mix with neat bitumen and synthetic fibres showed enhanced mechanical performance highlighting the structural effects of the used fibres. Full article
(This article belongs to the Special Issue Recycling Pavements Materials)
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11 pages, 4670 KiB  
Article
Recycled Polyester Geosynthetic Influence on Improvement of Road and Railway Subgrade Bearing Capacity— Laboratory Investigations
by Konrad Malicki, Jarosław Górszczyk and Zuzana Dimitrovová
Materials 2021, 14(23), 7264; https://doi.org/10.3390/ma14237264 - 27 Nov 2021
Cited by 7 | Viewed by 2768
Abstract
After years of using geosynthetics in civil engineering and infrastructure construction, it has recently become necessary to consider the possibility of recycling and reusing these materials. This paper presents the results of laboratory tests of the effect of recycled geogrid on the bearing [...] Read more.
After years of using geosynthetics in civil engineering and infrastructure construction, it has recently become necessary to consider the possibility of recycling and reusing these materials. This paper presents the results of laboratory tests of the effect of recycled geogrid on the bearing capacity of soils using a CBR test. A polyester geosynthetic was selected for testing due to its high resistance to biodegradation and wide application. In a series of laboratory tests, two types of road and railway subgrade were used, mixed with geosynthetic cuttings in two different weight concentrations. The aim of the research was to demonstrate whether old demolition geosynthetics could be used to strengthen road and rail subgrade as recycled material. The influence of the geosynthetic cutting shape was also considered. The obtained results confirm the possibility of using recycled geogrid to improve the bearing capacity of the pavement subgrade, at least under these laboratory conditions. In the case of sand, the use of 2.0% additive causes that the poorly compacted soil obtains sufficient bearing capacity for the layer of road improved subgrade. As expected, the level of this improvement depends on the type of soil and the shape of geogrid cuttings. Full article
(This article belongs to the Special Issue Recycling Pavements Materials)
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