Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
5.2
3.4
Journals
Materials
Special Issues
New Geopolymers Used in Civil Engineering
materials-logo
Submit to Materials Review for Materials Propose a Special Issue

Journal Menu

► Journal Menu

Journal Browser

► Journal Browser
share announcement

New Geopolymers Used in Civil Engineering

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

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 5792

Special Issue Editor

Prof. Dr. Petrica Vizureanu

E-Mail Website
Guest Editor
Faculty of Materials Science and Engineering, Gheorghe Asachi Technical University of Iasi, 41 D. Mangeron Street, 700050 Iasi, Romania
Interests: biomaterials; geoplymers; heat transfer; heat treatment; expert system; refractory materials; mine tailings
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Turning waste into resources is key to a circular economy. The need for proper waste management was defined by the EU in the document Roadmap to a Resource Efficient Europe (EU COM 2011) and was additionally underlined in the last few years by the introduction of the concept of the circular economy by the European Commission (EC), initially in 2014, "Towards a circular economy: a zero-waste program for Europe" (EU COM 2014), and next in 2015, "Closing the loop: an EU action plan for the Circular Economy" (EU COM 2015). The term "waste valorisation" refers to any industrial processing activities that aim to reuse, recycle, or compost waste, thus converting it into valuable products or resources of energy. It usually takes the form of one of the following activities: the processing of residue or by-products into raw materials, the use of discarded finished or semi-finished products as raw materials or energy resources, the use of waste materials in manufacturing process stages, and the addition of waste materials to finished products.

Prof. Dr. Petricǎ Vizureanu
Guest Editor

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

  • geopolymer
  • waste
  • mine tailings

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

11 pages, 4242 KiB  
Article
Mechanical Performance, Microstructure, and Porosity Evolution of Fly Ash Geopolymer after Ten Years of Curing Age
by Ikmal Hakem A. Aziz, Mohd Mustafa Al Bakri Abdullah, Rafiza Abd Razak, Zarina Yahya, Mohd Arif Anuar Mohd Salleh, Jitrin Chaiprapa, Catleya Rojviriya, Petrica Vizureanu, Andrei Victor Sandu, Muhammad FaheemMohd Tahir, Alida Abdullah and Liyana Jamaludin
Materials 2023, 16(3), 1096; https://doi.org/10.3390/ma16031096 - 27 Jan 2023
Cited by 2 | Viewed by 1271
Abstract
This paper elucidates the mechanical performance, microstructure, and porosity evolution of fly ash geopolymer after 10 years of curing age. Given their wide range of applications, understanding the microstructure of geopolymers is critical for their long-term use. The outcome of fly ash geopolymer [...] Read more.
This paper elucidates the mechanical performance, microstructure, and porosity evolution of fly ash geopolymer after 10 years of curing age. Given their wide range of applications, understanding the microstructure of geopolymers is critical for their long-term use. The outcome of fly ash geopolymer on mechanical performance and microstructural characteristics was compared between 28 days of curing (FA28D) and after 10 years of curing age (FA10Y) at similar mixing designs. The results of this work reveal that the FA10Y has a beneficial effect on strength development and denser microstructure compared to FA28D. The total porosity of FA10Y was also lower than FA28D due to the anorthite formation resulting in the compacted matrix. After 10 years of curing age, the 3D pore distribution showed a considerable decrease in the range of 5–30 µm with the formation of isolated and intergranular holes. Full article
(This article belongs to the Special Issue New Geopolymers Used in Civil Engineering)
►▼ Show Figures

Figure 1

15 pages, 4102 KiB  
Article
Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer
by Wan Mastura Wan Ibrahim, Mohd Mustafa Al Bakri Abdullah, Romisuhani Ahmad, Andrei Victor Sandu, Petrica Vizureanu, Omrane Benjeddou, Afikah Rahim, Masdiyana Ibrahim and Ahmad Syauqi Sauffi
Materials 2022, 15(17), 6163; https://doi.org/10.3390/ma15176163 - 05 Sep 2022
Cited by 13 | Viewed by 1805
Abstract
Geopolymers are an inorganic material in an alkaline environment that is synthesized with alumina–silica gel. The structure of geopolymers consists of an inorganic chain of material and a covalent-bound molecular system. Currently, Ordinary Portland Cement (OPC) has caused carbon dioxide (CO2) [...] Read more.
Geopolymers are an inorganic material in an alkaline environment that is synthesized with alumina–silica gel. The structure of geopolymers consists of an inorganic chain of material and a covalent-bound molecular system. Currently, Ordinary Portland Cement (OPC) has caused carbon dioxide (CO2) emissions which causes greenhouse effects. This analysis investigates the impact on fly ash/dolomite-based-geopolymer with various molarities of sodium hydroxide solutions which are 6 M, 8 M, 10 M, 12 M and 14 M. The samples of fly ash/dolomite-based-geopolymer were prepared with the usage of solid to liquid of 2.0, by mass and alkaline activator ratio of 2.5, by mass. After that, the geopolymer was cast in 50 × 50 × 50 mm molds before testing after 7 days of curing. The samples were tested on compressive strength, density, water absorption, morphology, elemental distributions and phase analysis. From the results, the usage of 8 M of NaOH gave the optimum properties for the fly ash/dolomite-based geopolymer. The elemental distribution analysis exposes the Al, Si, Ca, Fe and Mg chemical distribution of the samples from the selected area. The distribution of the elements is related to the compressive strength and compared with the chemical composition of the fly ash and dolomite. Full article
(This article belongs to the Special Issue New Geopolymers Used in Civil Engineering)
►▼ Show Figures

Figure 1

21 pages, 16299 KiB  
Article
Improvements of Flexural Properties and Thermal Performance in Thin Geopolymer Based on Fly Ash and Ladle Furnace Slag Using Borax Decahydrates
by Ng Yong-Sing, Liew Yun-Ming, Heah Cheng-Yong, Mohd Mustafa Al Bakri Abdullah, Phakkhananan Pakawanit, Petrica Vizureanu, Mohd Suhaimi Khalid, Ng Hui-Teng, Hang Yong-Jie, Marcin Nabiałek, Paweł Pietrusiewicz, Sebastian Garus, Wojciech Sochacki and Agata Śliwa
Materials 2022, 15(12), 4178; https://doi.org/10.3390/ma15124178 - 13 Jun 2022
Cited by 6 | Viewed by 1734
Abstract
This paper elucidates the influence of borax decahydrate addition on the flexural and thermal properties of 10 mm thin fly ash/ladle furnace slag (FAS) geopolymers. The borax decahydrate (2, 4, 6, and 8 wt.%) was incorporated to produce FAB geopolymers. Heat treatment was [...] Read more.
This paper elucidates the influence of borax decahydrate addition on the flexural and thermal properties of 10 mm thin fly ash/ladle furnace slag (FAS) geopolymers. The borax decahydrate (2, 4, 6, and 8 wt.%) was incorporated to produce FAB geopolymers. Heat treatment was applied with temperature ranges of 300 °C, 600 °C, 900 °C, 1000 °C and 1100 °C. Unexposed FAB geopolymers experienced a drop in strength due to a looser matrix with higher porosity. However, borax decahydrate inclusion significantly enhanced the flexural performance of thin geopolymers after heating. FAB2 and FAB8 geopolymers reported higher flexural strength of 26.5 MPa and 47.8 MPa, respectively, at 1000 °C as compared to FAS geopolymers (24.1 MPa at 1100 °C). The molten B2O3 provided an adhesive medium to assemble the aluminosilicates, improving the interparticle connectivity which led to a drastic strength increment. Moreover, the borax addition reduced the glass transition temperature, forming more refractory crystalline phases at lower temperatures. This induced a significant strength increment in FAB geopolymers with a factor of 3.6 for FAB8 at 900 °C, and 4.0 factor for FAB2 at 1000 °C, respectively. Comparatively, FAS geopolymers only achieved 3.1 factor in strength increment at 1100 °C. This proved that borax decahydrate could be utilized in the high strength development of thin geopolymers. Full article
(This article belongs to the Special Issue New Geopolymers Used in Civil Engineering)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop