Characterization of geopolymer fly-ash based foams obtained with the addition of Al powder or H2O2 as foaming agents

Ducman, Vilma; Korat, Lidija

doi:10.1016/j.matchar.2016.01.019

Cited by 232 publications

(121 citation statements)

References 19 publications

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“…e main challenge on inorganic insulation materials' development is related to the production of a high porous material with sufficient mechanical properties. Geopolymer foams can be produced by the introduction of foaming agents such as hydrogen peroxide [18][19][20][21], metal powders [22][23][24], or silica fumes [25][26][27]. eir foaming action is due to the oxygen or hydrogen formation in alkaline conditions according to the following reactions:…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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is paper concerns the synthesis of foamed geopolymers using fly ash and metallic Si as the binder and the porogent agent, respectively. e Taguchi approach was applied in order to study the effect of some significant synthesis parameters such as the Si foaming agent content (% w/w fly ash based), the alkali type (R : Na or K), and the alkalinity (R/Al molar ratio) of the activation solution on the compressive strength and apparent density of the foamed geopolymers. e final products were characterized by means of XRD, FTIR, and SEM, while optical microscopy was applied for the evaluation of the porosity. Lightweight geopolymers with a compressive strength of 2.08-14.88 ΜPa and an apparent density of 0.84-1.55 g/cm 3 were prepared by introducing a Si content up to 0.2% w/w on fly ash basis.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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“…The raw fly ash was mechanically activated for various duration (5,10,20,30, 60 and 120 min) in a tumbling laboratory ball mill with the size of Ø305×305 mm. During the grinding the specific grinding energy was measured.…”

Section: Methodsmentioning

confidence: 99%

“…As foaming agent hydrogen-peroxide [1,6,10] aluminum powder [7][8][9][10] or sodiumperborate [6] can be used. The cellular structure of geopolymers can be produced by introducing a large volume fraction of air bubbles into the paste.…”

Section: Introductionmentioning

confidence: 99%

“…The cellular structure of geopolymers can be produced by introducing a large volume fraction of air bubbles into the paste. In this case for the stabilization of the wet foam organic monomers can be used such as detergents, resin soap, glue resins, saponin, and hydrolyzed proteins [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The hydrogen-peroxide is thermodynamically unstable and therefore can be easily decomposed to water and oxygen gas with the latter playing the role of the geopolymer paste foaming agent [1,10].…”

Section: Introductionmentioning

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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Investigating the hydrophilicity of phenol formaldehyde foams: Effects of synthesis parameters

DSouza,

Li,

Yuan

et al. 2023

J of Applied Polymer Sci

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Open‐cell phenol (P) formaldehyde (F) foams are used for various applications such as hydroponic seed germination, flower arrangements, and sound insulation. This study investigated the influence of various parameters such as F/P molar ratios, blowing agents, surfactants, wetting agents, polymeric and inorganic additives, and oxidizing agents on the hydrophilicity of PF foams. Experimental results indicate that an F/P ratio of 1.8 was ideal for producing phenolic foams with good foam structure, uniform pore distribution, and favorable mechanical properties. A mixture of pentane and hexane at a mass ratio of 1:3 (wt/wt) used as a blowing agent resulted in a foam with the lowest density. With the optimal foaming catalyst (p‐toluene sulfonic acid) at a loading of 28 wt%, the foam exhibited a low density and excellent mechanical properties. A phenolic foam with a low density (39.27 kg/m3), high water absorption capacity (1210 wt%) and high open cell content (78.94%), was achieved by combining 6 wt% Tween‐80 as the surfactant and 3 wt% sodium dodecyl sulfate as the wetting agent. Additionally, 6.5 wt% loading of H2O2 led to a slight decrease in the foam density (38.46 kg/m3), but with a remarkable improvement in the wetting characteristics (water absorption capacity—2404 wt% and nearly 100% open cell content of the produced foam.

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Characterization of geopolymer fly-ash based foams obtained with the addition of Al powder or H2O2 as foaming agents

Cited by 232 publications

References 19 publications

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

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

Investigating the hydrophilicity of phenol formaldehyde foams: Effects of synthesis parameters

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