Microchemistry and microstructure of sustainable mined zeolite-geopolymer

The additive manufacturing technologies are fast-developing industrial sector and, potentially, a ground-breaking technology. They have many advantages such as the saving of resources and energy efficiency. However, the full exploitation of 3D printing technology for ceramic materials is currently limited; a lot of research is being conducted in this area. A promising solution seems to be geopolymers, but its application requires a better understanding of the behaviour this group of materials. This article analyses the influence of microstructure on mechanical properties whilst taking the production method into consideration. The paper is based on comparative analysis – the investigation is focused on the influence of material structure on the mechanical properties and fracture mechanism of these kinds of composites, including those reinforced with different kind of fibres. As a raw material for the matrix, fly ash from the Skawina coal power plant (located in: Skawina, Lesser Poland, Poland) was used. The investigation was made by SEM analysis. The results show that the microstructural analysis did not sufficiently explain the underlying reasons for the observed differences in the mechanical properties of the composites.

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“…3-6 have a structure characteristic of the geopolymers after the curing process (min. 28 days) [26][27][28]. In Fig.…”

Section: Resultsmentioning

confidence: 93%

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

et al. 2020

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“…A graph of compressive strength versus percent metaclay (MC) or percent metakaolin (MK) is shown in Figure 8a,b. Compressive strength was found to depend on the geopolymer material, the particle size of the reinforcement material and the composition of the geopolymer [42]. The compressive strength of the geopolymer/LDPE composite formed with 0.6 mm particle size was higher than that of 1.18 mm particle size.…”

Section: Effect Of Ldpe Particles On Compressive Strengthmentioning

confidence: 94%

“…The compressive strengths of geopolymer ceramics were measured with a Universal Mechanical Testing Machine series model 2810 (Figure 3) after 7 days of casting. Low curing temperatures of 30 • C and 50 • C for 24 h were chosen to reduce energy cost and to prevent initial cracks during water evaporation in the curing process [42]. For each ceramic sample, replicates of five tests were done to obtain the average compressive strength and standard deviation.…”

Section: Compressive Strengthmentioning

confidence: 99%

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

et al. 2021

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The quantity of polymer waste in our communities is increasing significantly. It is therefore necessary to consider reuse or recycling waste to avoid an increase in the risk to public health. This project is aimed at using pulverized low-density polyethylene (LDPE) waste as a source to reinforce and improve compressive strength, and to reduce the water absorption of geopolymer ceramics (GC). Clay:LDPE composition consisting of 5%, 10%, and 15% LDPE was geopolymerized with an NaOH/Na2SiO3 solution and cured at 30 °C and 50 °C. Characterization of the geopolymer samples was carried out using XRF and XRD. The microstructure was analyzed by SEM and chemical bonding by FTIR. The SEM micrographs showed LDPE particle pull-out on the geopolymer ceramics’ fracture surface. The result showed that the compressive strength increases with the addition of pulverized polymer waste compared to the controlled without LDPE addition. Water absorption decreased with an increase in LDPE addition in the geopolymer ceramics composite.

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“…On the other hand, peaks of chabazite and p-type zeolite were greater with increase of the concentration. The chabazite has been observed in geopolymers investigated by other several groups as well [31][32][33][34] . Naghizadeh et al 33 investigated the products in the geopolymers prepared using 1-3 M NaOH solution and cured at 80 °C.…”

Section: Resultsmentioning

confidence: 81%

Physical and adsorption characteristics of geopolymers prepared using 1–5 M NaOH solution for immobilization of radioactive wastes

Kinoshita

Yoda

Nakashima

et al. 2022

Journal of Nuclear and Radiochemical Sciences

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The temporal variations of compressive strength and flowability (slump-flow), and the adsorption behaviors of Co, Sr, and Cs for fly ash-based geopolymers, were investigated for immobilization of radioactive wastes. The geopolymer samples were prepared by using 1-5 M NaOH solution and cured at ambient temperature. The strength and flow were related to the amount and concentration of NaOH solution. The trends were discussed with the amount of heat generated at an early stage of curation. In addition, the geopolymers adsorbed Co equivalent to cements, Sr and Cs more than cements. The trends of absorption were related to the pH of leachates and the magnitude of x-ray diffraction (XRD) peaks of materials which possess larger distribution coefficients. We considered the possibilities to improve performance and to resolve problems in workability for actual use for immobilization of radioactive wastes according to the results of the present work.

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Microchemistry and microstructure of sustainable mined zeolite-geopolymer

Cited by 17 publications

References 50 publications

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

Physical and adsorption characteristics of geopolymers prepared using 1–5 M NaOH solution for immobilization of radioactive wastes

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