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Polymers
Special Issues
Advances in Fiber-Reinforced Polymers
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Advances in Fiber-Reinforced Polymers

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

Deadline for manuscript submissions: closed (5 August 2023) | Viewed by 5267

Special Issue Editors

Prof. Dr. Pu Zhang

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Guest Editor
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Interests: fiber-reinforced polymers
Dr. Ye Liu

E-Mail Website
Guest Editor
Department of Civil Engineering, Sichuan University, Chengdu 610106, China
Interests: fiber-reinforced polymers
Special Issues, Collections and Topics in MDPI journals
Dr. Zheng Huang

E-Mail Website
Guest Editor
College of Transportation and Civil Engineering, Nantong University, Nantong 226019, China
Interests: composite structures with new materials
Special Issues, Collections and Topics in MDPI journals
Dr. Chao Wang

E-Mail Website
Guest Editor
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden
Interests: fiber reinforced polymers; fatigue assessment; numerical simulation; dynamic analysis
Dr. Jaime H. Gonzalez-Libreros

E-Mail Website
Guest Editor
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden
Interests: Fiber reinforced polymers, strengthening, capacity assessment, concrete, infrastracture, structural health monitoring

Special Issue Information

Dear Colleagues,

We are pleased to invite you to contribute to this Special Issue, entitled “Advances in Fiber-Reinforced Polymers”. Fiber-reinforced polymers (FRPs) have been increasingly used in the construction industry worldwide. The corrosion resistance and high strength-to-weight ratio are among the main features that promote the use of FRP materials in beams, slabs, bridge decks, and walls to resist flexure and tension. With the progress in research during the last two decades, there is growing understanding and confidence after promoting the application of this new material in new fields such as building construction.

In this Special Issue, we are soliciting articles concerning the recent developments and applications in FRPs. Contributions in the following topics are welcome (but they need not be limited to this list):

  • Advanced FRPs;
  • FRP composite structures;
  • Behavior of FRP-reinforced/-strengthened RC members;
  • FRP for concrete confinement;
  • FRP-prestressed concrete;
  • Long-term performance of FRP-reinforced/-strengthened RC members.

Prof. Dr. Pu Zhang
Dr. Ye Liu
Dr. Zheng Huang
Dr. Chao Wang
Dr. Jaime H. Gonzalez-Libreros
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

  • FRP
  • concrete
  • strengthening
  • durability
  • mechanical properties
  • experimental studies
  • numerical models
  • design methods

Published Papers (3 papers)

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Research

13 pages, 7115 KiB  
Article
Thermoplastic Pultrusion Process of Polypropylene/Glass Tapes
by Fausto Tucci, Felice Rubino, Germana Pasquino and Pierpaolo Carlone
Polymers 2023, 15(10), 2374; https://doi.org/10.3390/polym15102374 - 19 May 2023
Cited by 6 | Viewed by 1590
Abstract
The present work focuses on the pultrusion of pre-impregnated glass-reinforced polypropylene tapes. An appositely designed laboratory-scale pultrusion line, consisting of a heating/forming die and a cooling die, was used. The temperature of the advancing materials and the pulling force resistance were measured by [...] Read more.
The present work focuses on the pultrusion of pre-impregnated glass-reinforced polypropylene tapes. An appositely designed laboratory-scale pultrusion line, consisting of a heating/forming die and a cooling die, was used. The temperature of the advancing materials and the pulling force resistance were measured by using thermocouples embedded in the pre-preg tapes and a load cell. From the analysis of the experimental outcomes, we gained insight into the nature of the material–machinery interaction and the transitions of the polypropylene matrix. The cross-section of the pultruded part was analyzed by microscope observation to evaluate the distribution of the reinforcement inside the profile and the presence of internal defects. Three-point bending and tensile testing were conducted to assess the mechanical properties of the thermoplastic composite. The pultruded product showed good quality, with an average fiber volume fraction of 23% and a limited presence of internal defects. A non-homogenous distribution of fibers in the cross-section of the profile was observed, probably due to the low number of tapes used in the present experimentation and their limited compaction. A tensile modulus and a flexural modulus of 21.5 GPa and 15.0 GPa, respectively, were measured. Full article
(This article belongs to the Special Issue Advances in Fiber-Reinforced Polymers)
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21 pages, 8212 KiB  
Article
Prediction of Stress–Strain Curves for HFRP Composite Confined Brick Aggregate Concrete under Axial Load
by Panumas Saingam, Ali Ejaz, Nazam Ali, Adnan Nawaz, Qudeer Hussain and Panuwat Joyklad
Polymers 2023, 15(4), 844; https://doi.org/10.3390/polym15040844 - 08 Feb 2023
Cited by 17 | Viewed by 1660
Abstract
Recently, hemp-fiber-reinforced polymer (HFRP) composites have been developed to enhance the strength and ductility of normal and lightweight aggregate concrete along with recycled brick aggregate concrete. In addition, both experimental and analytical investigations have been performed to assess the suitability of the existing [...] Read more.
Recently, hemp-fiber-reinforced polymer (HFRP) composites have been developed to enhance the strength and ductility of normal and lightweight aggregate concrete along with recycled brick aggregate concrete. In addition, both experimental and analytical investigations have been performed to assess the suitability of the existing strength and strain models. However, the theoretical and analytical expressions to predict the stress–strain curves of HFRP-confined concrete were not developed. Therefore, the main objective of this study was to develop analytical expressions to predict the stress–strain curves of HFRP-confined waste brick aggregate concrete. For this purpose, a new experimental framework was conducted to examine the effectiveness of HFRP in improving the mechanical properties of concrete constructed with recycled brick aggregates. Depending on the strength of the concrete, two groups were formed, i.e., Type-1 concrete and Type-2 concrete. A total of sixteen samples were tested. The ultimate compressive strength and strain significantly increased due to HFRP confinement. Improvements of up to 272% and 457% in the ultimate compressive strength and strain were observed due to hemp confinement, respectively. To predict the ultimate compressive strength and strain of HFRP-confined concrete, this study investigated several existing analytical stress–strain models. Some of the strength models resulted in close agreement with experimental results, but none of the models could accurately predict the ultimate confined strain. Nonlinear regression analysis was conducted to propose expressions to predict the ultimate compressive strength and strain of HFRP-confined concrete. The proposed expressions resulted in good agreement with experimental results. An analytical procedure was proposed to predict the stress–strain curves of hemp-confined concrete constructed by partial replacement of natural coarse aggregates by recycled fired-clay brick aggregates. A close agreement was found between the experimental and analytically predicted stress–strain curves. Full article
(This article belongs to the Special Issue Advances in Fiber-Reinforced Polymers)
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19 pages, 8830 KiB  
Article
Solid Particle Erosion Behavior on the Outer Surface of Basalt/Epoxy Composite Pipes Produced by the Filament Winding Technique
by Seyit Mehmet Demet, Harun Sepetcioglu and Mehmet Bagci
Polymers 2023, 15(2), 319; https://doi.org/10.3390/polym15020319 - 08 Jan 2023
Cited by 2 | Viewed by 1358
Abstract
Basalt/epoxy composite pipes in a [±55]4 winding configuration were produced on CNC filament winding machines (10 N fiber tension and ~11 mm bandwidth). In the experiments, a 34 m/s impact velocity was set using the double-disc method, and five different particle impingement [...] Read more.
Basalt/epoxy composite pipes in a [±55]4 winding configuration were produced on CNC filament winding machines (10 N fiber tension and ~11 mm bandwidth). In the experiments, a 34 m/s impact velocity was set using the double-disc method, and five different particle impingement angles (30, 45, 60, 75, and 90°) were used to determine the erosive effect on the outer surfaces of filament wound composite pipes under the influence of 600 μm erodent particles with angular geometry in the test set, complying with the ASTM G76-95 standard. The winding patterns in the lamina (±55 angle-ply laminate region) and zigzag (±55 zigzag region) regions of BFR/EP pipes were determined to have significant effects on solid particle erosion resistance, as evidenced by the SEM images. Full article
(This article belongs to the Special Issue Advances in Fiber-Reinforced Polymers)
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