Preparation and characterization of foamed geopolymers from waste glass and red mud

Bădănoiu, Alina; Saadi, Taha H. Abood Al; Stoleriu, Ştefania; Voicu, Georgeta

doi:10.1016/j.conbuildmat.2015.03.004

Cited by 112 publications

(56 citation statements)

References 13 publications

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“…The Si-Al rich matrix had better strength retention43. Although the geopolymers reduced in strength after the thermal treatment, the strength of >2 MPa was adequate for foamed materials34. On the other hand, based on Bernal et al 43,.…”

Section: Resultsmentioning

confidence: 99%

“…for fly ash geopolymers. However, according to Badanoiu et al 34,. the foamed geopolymers from glass and red mud experienced partial melting and softening.…”

Section: Resultsmentioning

confidence: 99%

“…In term of the thermal properties of foamed geopolymer, Badanoiu et al 34. observed the volume increment when exposed the foamed geopolymers based on glass cullet and red mud at temperature between 600 °C and 800 °C.…”

mentioning

confidence: 99%

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Thermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses

Cheng-Yong

Yun-Ming

Abdullah

et al. 2017

Sci Rep

114

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This paper presents a comparative study of the characteristic of unfoamed and foamed geopolymers after exposure to elevated temperatures (200–800 °C). Unfoamed geopolymers were produced with Class F fly ash and sodium hydroxide and liquid sodium silicate. Porous geopolymers were prepared by foaming with hydrogen peroxide. Unfoamed geopolymers possessed excellent strength of 44.2 MPa and degraded 34% to 15 MPa in foamed geopolymers. The strength of unfoamed geopolymers decreased to 5 MPa with increasing temperature up to 800 °C. Foamed geopolymers behaved differently whereby they deteriorated to 3 MPa at 400 °C and increased up to 11 MPa at 800 °C. Even so, the geopolymers could withstand high temperature without any disintegration and spalling up to 800 °C. The formation of crystalline phases at higher temperature was observed deteriorating the strength of unfoamed geopolymers but enhance the strength of foamed geopolymers. In comparison, foamed geopolymer had better thermal resistance than unfoamed geopolymers as pores provide rooms to counteract the internal damage.

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Section: Resultsmentioning

confidence: 99%

“…for fly ash geopolymers. However, according to Badanoiu et al 34,. the foamed geopolymers from glass and red mud experienced partial melting and softening.…”

Section: Resultsmentioning

confidence: 99%

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Thermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses

Cheng-Yong

Yun-Ming

Abdullah

et al. 2017

Sci Rep

114

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“…The production of commercial silicate solutions (Na 2 SiO 3 ·nH 2 O and K 2 SiO 3 ·nH 2 O) involves a high energy demand (temperatures close to 1000 °C-1400 °C) and the emission of greenhouse gases (7,8). In recent years there has been great interest for the use of alternative sources of amorphous reactive silica for producing alkaline activators: rice husk ash (3,4,(9)(10)(11)(12)(13)(14)(15)(16)(17), silica fume (2,3,(18)(19)(20)(21) and waste glasses (1,(22)(23)(24)(25) have been used and have shown similar microstructure and mechanical performance to geopolymers produced with commercial soluble silicate solutions (3,9,18,26,27).…”

Section: Introductionmentioning

confidence: 99%

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

2017

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Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 ºC. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

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“…Ye et al [19] mixed ground-granulated blast furnace slag (GGBFS) in varying proportions with calcined BR (800°C), reaching, for instance, 50 MPa after 28 days in a 50-50 wt% mix. Foamed BR-based geopolymers were synthesized by Badanoiu et al [20] using up to 25 wt% bauxite residue in combination with waste glass in the solid mix and the filtrate of red mud slurry and NaOH solution, respectively, as liquid component. All of these described inorganic polymers are characterized by a significant decrease in compressive strength with an increasing content of bauxite residue.…”

Section: Introductionmentioning

confidence: 99%

A Proposal for a 100 % Use of Bauxite Residue Towards Inorganic Polymer Mortar

Hertel

Blanpain

Pontikes

2016

J. Sustain. Metall.

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A new process is suggested in the present work turning bauxite residue (BR) into a ready-made mortar for the synthesis of inorganic polymers, effectively transforming the Bayer process into a zero-waste process. This was achieved by firing BR at 1100°C which supports the formation of liquid phase and results after subsequent fast cooling in a semivitreous material. Based on thermodynamic calculations, the process was subsequently improved by adding minor quantities of C and silica to BR before firing which leads to the carbothermic reduction of ferric iron into ferrous iron; the new blends demonstrated an increase in the melt formation and eventually in the content of amorphous phase after solidification. The resulting material was activated using a K-silicate solution and was cured at 60°C for 72 h. The synthesized materials were water insoluble and dense, demonstrating compressive strength exceeding 40 MPa for the silica-rich blend. These inorganic polymers can find applications in construction, such as pavement tiles or floor/roofing tiles. A possible implementation of the process to transform BR within the alumina refinery is also represented.

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Preparation and characterization of foamed geopolymers from waste glass and red mud

Cited by 112 publications

References 13 publications

Thermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses

Thermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

A Proposal for a 100 % Use of Bauxite Residue Towards Inorganic Polymer Mortar

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