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Polymers
Special Issues
Recycling and Reuse of Fiber Reinforced Polymer Wastes
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Recycling and Reuse of Fiber Reinforced Polymer Wastes

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Fibers".

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 10179

Special Issue Editors

Dr. Biao Hu

E-Mail Website
Guest Editor
School of Civil Engineering (Room A305), Shenzhen University, Nanhai Ave 3688, Shenzhen, China
Interests: composite materials and structures; durability; sustainable construction materials; structural intervention techniques
Special Issues, Collections and Topics in MDPI journals
Dr. Shishun Zhang

E-Mail Website
Guest Editor
School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: novel structures based on emerging materials; FRP-strengthened concrete structures; nonlinear finite element analysis of structures
Prof. Dr. Xin Wang

E-Mail Website
Guest Editor
School of Civil Engineering, Southeast University, Nanjing 210096, China
Interests: finite element analysis; construction materials; structural analysis; composite structures; hybrid materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yingwu Zhou

E-Mail Website
Guest Editor
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Interests: composite structures; eco-friendly construction materials; ultra-high-performance engineered cementitious composites; RC structure durability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The shortage of raw construction materials has been one of the most critical obstructions that hinders the sustainable development of the construction industry. The use of sustainable concrete helps to make the step forward towards achieving the carbon neutrality goal and helps to provide an alternative to mitigate the negative effects caused by a shortage of raw materials. As a result, it is of great significance to develop sustainable concrete using recycled wastes (including but not limited to fiber-reinforced polymer (FRP) wastes) as coarse aggregates. To overcome the natural defects of recycled wastes as coarse aggregates in concrete, notwithstanding the enormous efforts of the academic community and industry, low-cost, eco-friendly, and effective methods remain to be found. Therefore, new strategies for enhancing the quality of sustainable concrete incorporating recycled wastes are urgently needed and using the recycled FRP in the forms of fibers, needles, chippings, etc., is a very promising approach. Additionally, the widespread application and non-biodegradable nature of FRP composites make the recycling and reuse of FRP waste a feasible but urgent action. This Special Issue plans to give an overview of the most recent advances in the field of recycled FRPs and their applications in enhancing sustainable concrete incorporating recycled wastes. This Special Issue aims to provide selected contributions on advances in the recycling technology, characterization, and applications of recycled fibers, with the aim of enhancing the quality of sustainable concrete.

Potential topics include, but are not limited to: 

  • FRP recycling technologies;
  • Methods to improve the defects of recycled FRP;
  • Development of concrete incorporating recycled FRP;
  • Stress–strain modeling of concrete incorporating recycled FRP;
  • Durability of concrete incorporating recycled FRP;
  • Structural use of concrete incorporating recycled FRP.

Dr. Biao Hu
Prof. Dr. Shishun Zhang
Prof. Dr. Xin Wang
Prof. Dr. Yingwu Zhou
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. Polymers 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 2700 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

  • Recycled fiber

  • Recycled FRP needle
  • Recycled FRP powder
  • Recycled FRP aggregate
  • Recycling technology
  • Defects improvement
  • Recycled waste as coarse aggregate
  • Stress-strain modeling
  • Structural performance
  • Durability

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Published Papers (4 papers)

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Research

14 pages, 1994 KiB  
Article
Preparation and Properties of Municipal Solid Waste Incineration Alkali-Activated Lightweight Materials through Spontaneous Bubbles
by Yongyu Li, Hongxue Zhang, Guodong Huang, Yi Cui, Jiacheng Feng, Yuting Zhang, Dawei Li and Jielei Zhu
Polymers 2022, 14(11), 2222; https://doi.org/10.3390/polym14112222 - 30 May 2022
Cited by 1 | Viewed by 1564
Abstract
A self-foaming alkali-activated lightweight material was prepared by the pretreatment of municipal solid waste incineration bottom ash (BA). The low weight could be achieved without adding a foaming agent by using the low-density and self-foaming expansion characteristics of BA in combination with a [...] Read more.
A self-foaming alkali-activated lightweight material was prepared by the pretreatment of municipal solid waste incineration bottom ash (BA). The low weight could be achieved without adding a foaming agent by using the low-density and self-foaming expansion characteristics of BA in combination with a strong alkali. The effects of BA, liquid sodium silicate (LSS), and calcium hydroxide (CH) on dry and wet densities, as well as water absorption, are discussed. The results show that increasing the BA content can significantly improve the foaming effect and reduce the dry and wet densities of specimens. However, it also leads to a sudden decrease in compressive strength and a significant increase in water absorption. LSS and CH can significantly improve the ability to seal bubbles by accelerating condensation, and they further reduce dry and wet densities without significantly improving water absorption. It is most effective at BA, LSS, and CH contents of 60, 20, and 2%, respectively. Full article
(This article belongs to the Special Issue Recycling and Reuse of Fiber Reinforced Polymer Wastes)
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17 pages, 5288 KiB  
Article
Experimental Investigations on Bond Behavior between FRP Bars and Advanced Sustainable Concrete
by Yingwu Zhou, Guojian Wu, Limiao Li, Zhipei Guan, Menghuan Guo, Lei Yang and Zongjun Li
Polymers 2022, 14(6), 1132; https://doi.org/10.3390/polym14061132 - 11 Mar 2022
Cited by 15 | Viewed by 2807
Abstract
In response to resource shortage and carbon dioxide emissions, an innovative type of sustainable concrete containing LC3, seawater, sea sand, and surface-treated recycled aggregates is proposed in this study to replace traditional concrete. To understand the bond properties between the sustainable concrete and [...] Read more.
In response to resource shortage and carbon dioxide emissions, an innovative type of sustainable concrete containing LC3, seawater, sea sand, and surface-treated recycled aggregates is proposed in this study to replace traditional concrete. To understand the bond properties between the sustainable concrete and CFRP bars, an investigation was conducted on the bond behavior between sand-coated CFRP bars and advanced sustainable concrete. Pull-out tests were carried out to reveal the failure mechanisms and performance of this bond behavior. The results showed that the slip increased monotonically along with the increase in confinement. The bond strength increased up to approximately 15 MPa, and the critical ratio of C/D was reached. The critical ratio approached 3.5 for the Portland cement groups, while the ratio was determined as approximately 4.5 when LC3 was introduced. When the proportion of LC3 reached 50%, there was a reduction in bond strength. A multisegmented modified bond–slip model was developed to describe the four-stage bond behavior. In terms of bond strength and slip, the proposed advanced concrete exhibited almost identical bond behavior to other types of concrete. Full article
(This article belongs to the Special Issue Recycling and Reuse of Fiber Reinforced Polymer Wastes)
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17 pages, 10787 KiB  
Article
Semi-Reliability Probability Damage Assessment of GFRP Bars Embedded in Steam-Curing Concrete Beams Based on the Multiple Factors Related Moisture Absorption Model
by Kai Zhang, Wenrui Yang, Huiying Li, Zhiyi Tang, Weiwei Wu, Jiao Yuan and Zhongmin Feng
Polymers 2021, 13(24), 4409; https://doi.org/10.3390/polym13244409 - 16 Dec 2021
Cited by 3 | Viewed by 1994
Abstract
GFRP bars will be damaged due to a series of irreversible hygroscopic chemical reactions under humid and hot curing environmental conditions. The multiple factors related to the moisture absorption model were established through the moisture absorption test of GFRP bars embedded in steam-curing [...] Read more.
GFRP bars will be damaged due to a series of irreversible hygroscopic chemical reactions under humid and hot curing environmental conditions. The multiple factors related to the moisture absorption model were established through the moisture absorption test of GFRP bars embedded in steam-curing concrete, which considered different curing temperatures, different thicknesses of the protective layer, and different diameters of GFRP bars. Semi-reliability probability damage assessment of GFRP bars embedded in steam-curing concrete was described by introducing the reliability and stochastic theory. Subsequently, the tensile test of GFRP bars was carried out to verify the feasibility of the damage assessment. The results showed that the moisture absorption curves of GFRP bars were basically in line with Fick’s law. In addition, the influences of the curing temperature, the thickness of the protective layer, and the diameter on moisture absorption performance were presented. The semi-reliability probability damage assessment model of GFRP bars embedded in steam-curing concrete beams adequately considered the multiple factors related to moisture absorption and the uncertainty and randomness of the influencing factors during the process of moisture absorption. Full article
(This article belongs to the Special Issue Recycling and Reuse of Fiber Reinforced Polymer Wastes)
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17 pages, 5835 KiB  
Article
Mechanical Behaviour of Completely Decomposed Granite Soil with Tire Rubber Granules and Fibres
by Ru Fu and Wei Li
Polymers 2021, 13(23), 4261; https://doi.org/10.3390/polym13234261 - 6 Dec 2021
Cited by 1 | Viewed by 2366
Abstract
Mixing soil with waste tire rubber granules or fibres is a practical and promising solution to the problem of global scrap tire pollution. Before successful applications, the mechanical behaviour of the soil–rubber mixture must be thoroughly investigated. Comprehensive laboratory studies (compaction, permeability, oedometer [...] Read more.
Mixing soil with waste tire rubber granules or fibres is a practical and promising solution to the problem of global scrap tire pollution. Before successful applications, the mechanical behaviour of the soil–rubber mixture must be thoroughly investigated. Comprehensive laboratory studies (compaction, permeability, oedometer and triaxial tests) were conducted on the completely decomposed granite (CDG)–rubber mixtures, considering the effects of rubber type (rubber granules GR1 and rubber fibre FR2) and rubber content (0–30%). Results show that, for the CDG–rubber mixture, as the rubber content increases, the compaction curves become more rubber-like with less obvious optimum moisture content. The effect on permeability becomes clearer only when the rubber content is greater than 30%. The shape effect of rubber particles in compression is minimal. In triaxial shearing, the inclusion of rubber particles tends to reduce the stiffness of the mixtures. After adding GR1, the peak stress decreases with the increasing rubber content due to the participation of soft rubber particles in the force transmission, while the FR2 results in higher peak stress especially at higher rubber contents because of the reinforcement effect. For the CDG–GR1 mixture, the friction angle at the critical state (φ’cs) decreases with the increasing rubber content, mainly due to the lower inter-particle friction of the CDG–rubber interface compared to the pure CDG interface, while for the CDG–FR2 mixture, the φ’cs increases with the increasing rubber content, again mainly due to the reinforcement effect. Full article
(This article belongs to the Special Issue Recycling and Reuse of Fiber Reinforced Polymer Wastes)
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