Comparative study of dielectric properties of geopolymer matrices using different dielectric powders

Essaidi, N.; Nadir, Houda; Martinod, Edson; Feix, Noël; Bertrand, Valérie; Tantot, Olivier; Lalande, Michèle; Rossignol, Sylvie

doi:10.1016/j.jeurceramsoc.2017.04.036

Cited by 10 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metakaolin was added to the solution. Moreover, some additives such as ZrO 2 or BaTiO 3 are also included to obtain high dielectric permittivity values [23].…”

Section: Experimental Protocol For Obtaining a Geopolymer Materialsmentioning

confidence: 99%

Small form factor UWB antenna integrating geopolymer dielectric material

Nadir

Gharzouni²,

Martinod

et al. 2019

IET Microwaves, Antennas & Propagation

Self Cite

View full text Add to dashboard Cite

This study presents a new design of a reduced volumetric ultra‐wideband (UWB) antenna using innovative dielectric based on the use of geopolymer material which is safe and eco‐friendly. The created antenna is intended to radiate in the air. The impedance mismatch due to interface dielectric/air at the aperture of the antenna imposes to choose dielectric material with an appropriate permittivity value. In this study, the authors focus on the experimental protocol that they use to elaborate a dielectric material with suitable dielectric properties over an UWB domain. An experimental phase of dielectric properties assessment is also described. The conceived antenna is inspired by K‐antenna which constitutes the starting point of the proposed new antenna design, particularly because of their small dimensions. The antenna is intended to operate in a frequency band ranging from 300 MHz to 3 GHz. The authors demonstrate that the use of an appropriate innovative dielectric material like a geopolymer is an efficient way to reduce the antenna size. Furthermore, the behaviour of the antenna filled with geopolymer is validated using experimental results.

show abstract

“…Metakaolin was added to the solution. Moreover, some additives such as ZrO 2 or BaTiO 3 are also included to obtain high dielectric permittivity values [23].…”

Section: Experimental Protocol For Obtaining a Geopolymer Materialsmentioning

confidence: 99%

Small form factor UWB antenna integrating geopolymer dielectric material

Nadir

Gharzouni²,

Martinod

et al. 2019

IET Microwaves, Antennas & Propagation

Self Cite

View full text Add to dashboard Cite

show abstract

“…Geopolymer is an inorganic cementitious material obtained from silica-aluminum minerals by alkaline solution excitation at room temperature 4 , which has excellent properties such as early strength, high temperature and acid and alkali corrosion resistance, as well as the advantages of lower energy consumption and CO 2 emission, and therefore becomes a research hotspot in the eld of solid waste resource utilization [5][6][7] . Coal gangue is rich in aluminum-silicate mineral fractions, among which the content of SiO 2 and Al 2 O 3 is as high as 60% ~ 95%, which is highly potential for the preparation of geopolymers 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of coal gangue based geopolymer and electrical conductivity studies

Zha,

Lv,

et al. 2024

Preprint

View full text Add to dashboard Cite

Geopolymers are both an effective way to achieve solid waste utilization of coal gangue and an environmentally friendly alternative to ordinary Portland cement. At the same time, the rich ionic content of geopolymers gives them superior conductivity, which makes them potentially valuable for applications in a variety of fields such as nondestructive testing, ice and snow melting, and electromagnetic shielding. However, the influence of external factors on its conductivity is still unclear, which limits its wide application in construction. In this study, coal gangue and slag are used to prepare geopolymer under alkaline excitation conditions, and the influence laws of alkali equivalent, slag substitution rate, modulus and water-cement ratio on its consistency, compressive strength and resistivity are investigated, and the changing law of resistivity of specimens with the curing ages and water content are also explored. It is found that the compressive strength is affected by alkali equivalent, slag substitution rate, modulus and water-cement ratio. When the alkali equivalent, slag substitution rate, modulus and water-cement ratio are taken to 12%, 55%, 1.2, 5 or12%, 45%,1.2, 4 respectively, the compressive strength at 28 days could be more than 80 MPa. Resistivity is first decreased and then increased with increasing alkali equivalent, increasing slag substitution rate, or increasing modulus, and is decreased with increasing water-cement ratio, and all of them are increased with increasing curing ages. At the age of 7 days, it is most significantly affected by alkali equivalent, while after the age of 14 days, it is more significantly affected by modulus and slag substitution rate than alkali equivalent; the effect of water-cement ratio is smaller at different ages. In addition, the resistivity is shown to increase significantly with decreasing water content, and the resistivity is increased by nearly 5–6 orders of magnitude when the specimens are transformed from the surface-dry state to the dry state.

show abstract