Effect of synthesis parameters on the mechanical properties of fly ash-based geopolymers

Panias, Dimitrios; Giannopoulou, Ioanna; Perraki, Theodora

doi:10.1016/j.colsurfa.2006.12.064

Cited by 577 publications

(239 citation statements)

References 17 publications

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“…Peak corresponding to 796 cm −1 related to Si-O-Si bonds symmetric stretching vibration [12,13]. It can be stated, that the increasing grinding time resulted in slightly higher peak intensities, which can be associated to higher infra absorbance due to higher specific surface area of fine particles.…”

Section: Materials Structurementioning

confidence: 98%

“…It is associated with dissolution of amorphous phase of fly ash in strong alkali media according to Panias et al [12]. The peak intensities of gopolymer foam increased as function of increasing grinding time.…”

Section: Materials Structurementioning

confidence: 99%

“…8) it can be observed that the grinding of fly ash caused changing of geopolymer foam material structure. Based on Panias et al [12] peak at 3318 cm −1 corresponding to -OH, HOH bonds stretching vibration while the peak at 1641 cm −1 sign the HOH bonds bending vibration. Peak at 1404 cm −1 related to O-C-O stretching vibration.…”

Section: Materials Structurementioning

confidence: 99%

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Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

Szabó¹,

Gombkötő²,

Svéda³

et al. 2017

Archives of Metallurgy and Materials

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Present paper deals with the development of geopolymer foam prepared from ground F class power station fly ash. The effect of the fly ash fineness on the rheology of the geopolymer paste and the foam properties have been investigated. The raw fly ash was ground in a ball mill for various duration, 5, 10, 20, 30, 60 and 120 min. Geopolymer paste was prepared from the raw and ground fly ash with NaOH -sodium silicate mixture as alkaline activator. Geopolymer foam production was made using H 2 O 2 as foaming agent. Additionally, the geopolymer material structure was investigated by Fourier transform infrared spectrometer, the foam cell structure was monitored using optical microscopy. The rheological behaviour of the geopolymer paste changed due to the grinding of fly ash (from Bingham plastic to Newtonian liquid). Grinding of fly ash has a significant effect on the physical properties as well as on the cell structure of the geopolymer foam.

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Section: Materials Structurementioning

confidence: 98%

Section: Materials Structurementioning

confidence: 99%

Section: Materials Structurementioning

confidence: 99%

See 1 more Smart Citation

Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

Szabó¹,

Gombkötő²,

Svéda³

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…The results of FTIR measurements are shown in Fig. 7 where the characteristic bonds [29] are marked and the results are summarized in Table 2. It was found in all zeolites due to the internal tetrahedron vibrations and is assigned to a T-O stretching mode [30].…”

Section: Ftirmentioning

confidence: 99%

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Bohács¹,

Faitli²,

Bokányi³

et al. 2017

Archives of Metallurgy and Materials

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Due to the special characteristics of zeolites, they can be applied in a very wide range of industries, i.e. agricultural, environmental or water treatment purposes. Generally, high added value zeolite products are manufactured by micro-or nanogrinding. However, these processes require high energy input and cause significant wearing of the mill parts. Therefore, the optimization of zeolite grinding, as well as the control of its properties are of a great importance. In the present paper a Hungarian natural zeolite was mechanically activated in stirred media mill for various residence times in distilled water, meanwhile the particle size distribution and the grinding energy were measured. Additionally, on-line tube rheometer was used to study the rheology of the suspension during the grinding process. The particle interaction and the suspension aggregation stability were detected by zeta-potential measurements. Structural changes due to the mechanical activation process were monitored by FTIR. It was found that the material structure of the zeolite, as well as the rheological behaviour of the zeolite suspension and its aggregation stability had been altered due to the mechanical activation in the stirred media mill. It can be concluded that the zeolite product properties can be modified by mechanical activation in order to produce a high added value tailored material.

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“…It is known that the alkali concentration determined by the molar concentration is an important factor in relation to geopolymerization since it is responsible for dissolving the glassy structure of the fly ash, activating the silicon and aluminum to form the precursor gel [29,30]. Higher leaching of silica and alumina [31] promotes better binding between the solid particles in the final structure of the system [32] and it contributes to the mechanical properties of the hardened geopolymer [33]. However, the compressive strength was mainly influenced by the curing regime parameter.…”

Section: Figurementioning

confidence: 99%

Effect of NaOH concentration and curing regime on geopolymer

Livi

Repette

2017

Rev. IBRACON Estrut. Mater.

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ResumoThe effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions. Prismatic specimens were molded, cured at 65 °C and 85 °C and submitted to flexural and compressive strength tests. Unreacted fly ash and geopolymers were characterized by X-ray diffraction and thermogravimetric analysis. In general, the mechanical strength was enhanced by increasing the molar concentration and the curing temperature. This trend was confirmed by thermogravimetric data. However, for a lower amount of NaOH there were no significant differences between the strength results. The mixture with the highest strength was obtained with the 16 M NaOH solution and curing temperature of 85 °C, which resulted in flexural strength of 4.20 MPa, compressive strength of 21.35 MPa and also the highest weight loss of 9.89%.

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Effect of synthesis parameters on the mechanical properties of fly ash-based geopolymers

Cited by 577 publications

References 17 publications

Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Effect of NaOH concentration and curing regime on geopolymer

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