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Special Issue "New Geopolymers Used in Civil Engineering"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 20 December 2022 | Viewed by 1849

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

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Keywords

  • geopolymer
  • waste
  • mine tailings

Published Papers (2 papers)

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Research

Article
Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer
Materials 2022, 15(17), 6163; https://doi.org/10.3390/ma15176163 - 05 Sep 2022
Cited by 1 | Viewed by 577
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)
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Article
Improvements of Flexural Properties and Thermal Performance in Thin Geopolymer Based on Fly Ash and Ladle Furnace Slag Using Borax Decahydrates
Materials 2022, 15(12), 4178; https://doi.org/10.3390/ma15124178 - 13 Jun 2022
Cited by 1 | Viewed by 770
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)
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