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Buildings
Special Issues
Utilization of Recycled Aggregates and Waste in Road Engineering
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Utilization of Recycled Aggregates and Waste in Road Engineering

A special issue of Buildings (ISSN 2075-5309). This special issue belongs to the section "Building Materials, and Repair & Renovation".

Deadline for manuscript submissions: 31 May 2024 | Viewed by 777

Special Issue Editors

Prof. Dr. Peilong Li

E-Mail Website
Guest Editor
Key Laboratory of Road Structure & Material, Ministry of Transport, Chang’an University, Xi’an 710064, China
Interests: waste resourcing; high-performance road materials; micromechanical behavior of asphalt mixtures; evolutionary behaviour of pavement performance
Dr. Zhan Ding

E-Mail Website
Guest Editor
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, School of Water and Environment, Ministry of Education, Chang’an University, Xi’an 710064, China
Interests: waste resource utilisation; environmentally friendly materials; energy saving and carbon emission reduction technologies
Dr. Xiuming Jiang

E-Mail Website
Guest Editor
School of Highway, Chang’an University, Xi’an 710064, China
Interests: value-added conversion of wastes; sustainable road materials; rheological behavior of road materials; interfacial behaviour of multiphase composites

Special Issue Information

Dear Colleagues,

The high-quality development of society is facing constraints imposed by resource scarcity, energy shortages and environmental pollution. While road engineering makes an outstanding contribution to social and economic development, the consumption of non-renewable resources (e.g., mineral aggregates and asphalt binders) during the life cycle of roads cannot be ignored. At the same time, human production and living activities have resulted in a large amount of waste (including construction, asphalt mixture, rubber, plastic and agroforestry waste) for which there is a lack of resourceful utilization methods. Inappropriate disposal practices such as piling, burying and incineration not only result in a serious waste of resources but also cause pollution to water bodies, soil and the atmosphere. Therefore, this Special Issue aims to stimulate broad research and discussion around waste material resourcing and its application in road engineering.

The scope includes, but is not limited to, the following:

  • Road materials with waste components.
  • Recycled aggregates in road engineering.
  • Recycling of road materials and waste management.
  • Bio-based materials in road engineering.
  • Materials, techniques and practices related to reclaimed asphalt pavement (RAP).
  • Materials, technologies and methods to enhance the durability of asphalt pavements.

In this Special Issue, original research articles and reviews are welcome. Submitted studies should clearly identify their novelty and contribution to the state of the art.

We look forward to receiving your contributions.

Prof. Dr. Peilong Li
Dr. Zhan Ding
Dr. Xiuming Jiang
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. Buildings is an international peer-reviewed open access monthly 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

  • road engineering
  • waste materials
  • recycled aggregates
  • reclaimed asphalt pavement (RAP)
  • sustainable asphalt materials
  • bio-based road materials

Published Papers (1 paper)

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Research

20 pages, 6749 KiB  
Article
Performance and Heavy Metal Analysis of Graphite Tailings Cured Using Cementitious Materials
by Ruixin Jiang and Zhengjun Wang
Buildings 2024, 14(2), 537; https://doi.org/10.3390/buildings14020537 - 17 Feb 2024
Viewed by 596
Abstract
The massive accumulation of graphite tailings causes serious environmental pollution, mainly from heavy metal pollution. Therefore, this article introduces a method of using graphite tailings as a high-content main material, cement as a small component of the auxiliary cementitious material, and clay as [...] Read more.
The massive accumulation of graphite tailings causes serious environmental pollution, mainly from heavy metal pollution. Therefore, this article introduces a method of using graphite tailings as a high-content main material, cement as a small component of the auxiliary cementitious material, and clay as a substitute for cement. The compressive strength and permeability of graphite tailing–solidified material (GT, GT–Clay) were tested, and the effect of clay partially replacing cement as an auxiliary cementitious agent on GT–Clay performance was compared. In addition, inductively coupled plasma mass spectrometry (ICP) was used to analyze the effect of the graphite tailing placement time on the heavy metal content, as well as the changes in the GT heavy metal leaching concentration and its heavy metal content under outdoor freeze–thaw conditions. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to elucidate the microstructural changes in the GT–Clay. The experimental results show that, as the substitution of clay for cement increased from 0 to 50%, the compressive strength of the 90% GT–Clay gradually decreased, and the permeability also increased. The compressive strength of 95% GT–Clay did not show significant changes, but the permeability increased, and when mixed with quicklime, gypsum, and silica fume, the permeability decreased. The Ni and As in graphite tailings fluctuated significantly with the placement time. The heavy metal leaching concentrations of the 90% GT and 95% GT were below the standard limit, and Cd, As, and Ni in GT were potential sources of pollution. The analysis of the microscopic test results showed that the hydration products of the GT–Clay included ettringite, Ca(OH)2, and calcium silicate hydrates. The hydration product stabilized and filled the gaps between the tailing particles, thereby cementing them together. Not only did it improve the mechanical strength of GT, it also reduced the permeability and heavy metal leaching rate. This study provides a new analytical approach to applying graphite tailings for environmental treatment. Full article
(This article belongs to the Special Issue Utilization of Recycled Aggregates and Waste in Road Engineering)
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