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Polymers
Special Issues
Recent Development in Geopolymers
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Recent Development in Geopolymers

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

Deadline for manuscript submissions: closed (10 June 2023) | Viewed by 2466

Special Issue Editors

Prof. Dr. Ildiko Merta

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Guest Editor
TU Wien Faculty of Civil Engineering, Institute of Material Technology, Building Physics and Building Ecology, Karlsplatz 13/E207-1, 1040 Vienna, Austria
Interests: cement-based composites; geopolymers; polymer fibre-reinforced composites; fibre-reinforced concretes; building material science; sustainable bio-based composites; using waste materials in composites; supplementary cementitious materials; durability and long-term performance of composites; high-performance composites
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Vlastimir Radonjanin

E-Mail Website
Guest Editor
Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia
Interests: cement-based composites; recycled aggregate concrete; geopolymers; green concrete composites; bio-based composites; durability of cement-based composites; repair materials for concrete structures
Prof. Dr. Mirjana Malešev

E-Mail Website
Guest Editor
Faculty of Technical Science, University of Novi Sad, 21000 Novi Sad, Serbia
Interests: cement-based composites; recycled aggregate concrete; geopolymers; green concrete composites; bio-based composites; durability of cement-based composites; repair materials for concrete structures

Special Issue Information

Dear Colleagues,

We are writing to invite you to submit your research results to the Special Issue of “Recent Development in Geopolymers”.

Recently, geopolymers have been the most commonly researched sustainable alternative binders to traditional cement-based binders in cementitious composites. It has been shown that geopolymers can provide viable mechanical properties for a potential replacement of structural concrete if properly designed and cured.

In this Special Issue, we aim to update the community on recent developments in the field of geopolymer composites and their applications in the area of novel sustainable building materials. The specific areas of interest of the Special Issue include (but are not limited to) the composition and matrix mix design of geopolymer cements, mortars and concretes, along with reinforced matrices (longitudinal-, fiber-, or textile reinforcement). The issue will address the composites’ properties in fresh and hardened states, including their physical, mechanical and fracture mechanical characteristics. Topics may include creep, shrinkage, and carbonation, as well as the durability and long-term behavior aspects of the composite. Applications of geopolymer composites in building constructions, retrofit, and maintenance are also welcomed.

Ideally, contributions will focus on fundamental results, mechanisms and applications that will help to compile the current state-of-the-art developments and highlight their range of applications. Both original contributions and reviews are welcome. 

Prof. Dr. Ildiko Merta
Prof. Dr. Vlastimir Radonjanin
Prof. Dr. Mirjana Malešev
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

  • geopolymer mix design
  • geopolymer mortar
  • geopolymer concrete
  • fibre-reinforced geopolymer
  • physical properties
  • mechanical properties
  • fracture properties
  • durability properties
  • geopolymer applications

Published Papers (2 papers)

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Research

16 pages, 6511 KiB  
Article
Feasibility Study of Using Hydrophobic Geopolymer-Based as Aggregate Substitution in Asphalt Mixture
by Cadnel Ago, Guowei Li, Jiantao Wu and Nur Izzi Md Yusoff
Polymers 2023, 15(14), 3077; https://doi.org/10.3390/polym15143077 - 18 Jul 2023
Cited by 2 | Viewed by 764
Abstract
Hydrophobic aggregates have the great ability to prevent asphalt pavement roads from stripping-off of the asphalt in presence of water. In addition, they give the option to consume less asphalt and save cost. On the other hand, natural aggregates have been found to [...] Read more.
Hydrophobic aggregates have the great ability to prevent asphalt pavement roads from stripping-off of the asphalt in presence of water. In addition, they give the option to consume less asphalt and save cost. On the other hand, natural aggregates have been found to be non-renewable and rare. Geopolymer based artificial aggregates are great materials as they demonstrated to have exceptional features, such as high strength, superior durability, and greater resistance to fire exposure. In this study, a new hydrophobic geopolymer based aggregate has been produced with rice ash (RA) and fly ash as precursors as well as, Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) as activators. The mechanical properties combined with the softening coefficient, surface properties of samples, contact angle and adhesion were characterized as well as microstructure X-ray diffraction (XRD) and Scanning electron microscopy (SEM) test. The results indicate that the activators Na2SiO3/NaOH at a mix ratio of 1 have a suitable effect on the pores and the compressive strength of the new artificial aggregate most particularly sodium hydroxide. Nonetheless, it has been found that coating the artificial aggregate with asphalt showed a great improvement of the hydrophobic nature of the produced artificial aggregate based geopolymer. Hence, indicates the possibility of using it as recycle aggregate pavement. From a microstructure point, the hydrophobic nature of the new alkali-activated artificial aggregate can be improved by increasing the quantity of mullite in the mix proportion design. Full article
(This article belongs to the Special Issue Recent Development in Geopolymers)
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27 pages, 13636 KiB  
Article
Study on Road Performance of Polyurethane Cold-Recycled Mixture
by Zhenxia Li, Tengteng Guo, Yuanzhao Chen, Tong Zhang, Deqing Tang, Menghui Hao, Xu Zhao and Jinyuan Liu
Polymers 2023, 15(8), 1958; https://doi.org/10.3390/polym15081958 - 20 Apr 2023
Cited by 3 | Viewed by 1390
Abstract
To give full play to the advantages of polyurethane as a binder, such as mixing at room temperature, short curing time, and high curing strength, polyurethane was used as the binder of a waste asphalt mixture, and the pavement performance of PCRM (Polyurethane [...] Read more.
To give full play to the advantages of polyurethane as a binder, such as mixing at room temperature, short curing time, and high curing strength, polyurethane was used as the binder of a waste asphalt mixture, and the pavement performance of PCRM (Polyurethane Cold-Recycled Mixture) was analyzed. Firstly, the adhesion performance of polyurethane binder with new and old aggregates was evaluated using the adhesion test. Then, the mix proportion was designed according to the material characteristics, and the reasonable molding process, maintenance conditions, design indexes, and the optimal binder ratio were proposed. Secondly, the high-temperature stability, low-temperature crack resistance, water stability, and compressive resilient modulus of the mixture were evaluated through laboratory tests. Finally, the pore structure and microscopic morphology of polyurethane cold-recycled mixture were analyzed by industrial CT (Computerized Tomography) scanning, and the failure mechanism of polyurethane cold-recycled mixture was revealed. The test results show that the adhesion between polyurethane and RAP (Reclaimed Asphalt Pavement) is good, and the splitting strength of the mixture increases greatly when the ratio of glue to stone reaches 9%. Polyurethane binder has low sensitivity to temperature and poor water stability. With the increase of RAP content, the high-temperature stability, low-temperature crack resistance, and compressive resilient modulus of PCRM showed a decreasing trend. When the RAP content was less than 40%, the freeze–thaw splitting strength ratio of the mixture was improved. After the incorporation of RAP, the interface was more complex and there were many micron-scale holes, cracks, and other defects; after high-temperature immersion, the polyurethane binder appeared to show a certain degree of peeling at the holes of the RAP surface. After freeze–thaw, the polyurethane binder on the surface of the mixture produced many cracks. The study of polyurethane cold-recycled mixture is of great significance to realize green construction. Full article
(This article belongs to the Special Issue Recent Development in Geopolymers)
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