Geopolymer foams: An overview of recent advancements

Novais, Rui M.; Pullar, Robert C.; Labrincha, J.A.

doi:10.1016/j.pmatsci.2019.100621

Cited by 191 publications

(87 citation statements)

References 189 publications

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“… 6 , 8 Highly porous geopolymer foams are a recent addition to the group of inorganic foams. 9 Pores are commonly introduced into the geopolymers by the incorporation of a blowing agent (e.g., H 2 O 2 or metallic Al powder) during synthesis, 10 , 11 but other methods exist, such as mechanical foaming, 12 sacrificial templating, 13 freeze-casting, 14 additive manufacturing, 15 and emulsion templating. 16 …”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Selkälä

Suopajärvi

Sirviö

et al. 2020

ACS Appl. Mater. Interfaces

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In this work, a surface cationized inorganic–organic hybrid foam was produced from porous geopolymer (GP) and cellulose nanocrystals (CNCs). GPs were synthesized from alkali-activated metakaolin using H 2 O 2 as a blowing agent and hexadecyltrimethylammonium bromide (CTAB) as a surfactant. These highly porous GPs were combined at pH 7.5 with cationic CNCs that had been synthesized from dissolving pulp through periodate oxidation followed by cationization in a deep eutectic solvent. The GP-CNC hybrid foams were employed as reactive filters in the removal of the anionic dye, methyl orange (MO; 5–10 mg/L, pH 7). The effects of a mild acid wash and thermal treatments on the structure, properties, and adsorption capacity of the GPs with CNCs and MO were investigated. The CNCs aligned as films and filaments on the surfaces of the neutralized GPs and the addition of CNCs improved MO removal by up to 84% compared with the reference sample. In addition, CTAB was found to disrupt the attachment of CNCs on the pores and improve adsorption of MO in the GPs with and without CNCs.

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Section: Introductionmentioning

confidence: 99%

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Selkälä

Suopajärvi

Sirviö

et al. 2020

ACS Appl. Mater. Interfaces

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“…Despite these advantages the use of geopolymers is still low compared to Portland cement concrete [5]. One of the most significant limitations for the application of geopolymers is the formation of efflorescence on the surface of the materials [6,7].…”

Section: Introductionmentioning

confidence: 99%

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

et al. 2020

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Efflorescence is one of the limitations of the widespread use of geopolymers. This problem is caused by excess unreacted sodium oxide remaining inside materials. Unreacted sodium oxide creates white efflorescence on the surface of the produced material in the form of sodium carbonate heptahydrate Na2CO3∙ 7H2O. It decreases not only the aesthetic value of the final products, but also the mechanical properties of the material. The aim of this article is to analyse the influence of the curing method on the appearance of efflorescence on geopolymer composites reinforced by short basalt, especially on mechanical properties. Class F fly ash from the ‘Skawina’ coal-fired power plant (located in Skawina, Lesser Poland, Poland) was used as raw material for the geopolymerization process. The article compares two methods of curing: typical laboratory conditions (in the air) and samples submerged in water. Three series of fly ash-based geopolymer were cast: basalt fibres were added as 1% and 2% by weight of fly ash and one control series without any fibres. The investigation was performed using visual analysis, including microstructure investigation, and the testing of mechanical properties (compressive strength at ambient temperature) after 28 days.

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“…There were several attempts to investigate foamed geopolymers reinforced by fibers. Most of the research was dedicated to reinforcement by artificial fibers such as carbon [27][28] or glass [29][30], including waste products [29][30]. Some of the investigations have been done on the composites with natural fibers such as hemp [31][32], abaca [33], cellulose [34][35] and jute [36].…”

Section: Introductionmentioning

confidence: 99%

Impact of Flax Fiber Reinforcement on Mechanical Properties of Solid and Foamed Geopolymer Concrete

Korniejenko

Łach

Hebdowska-Krupa

et al. 2020

Adv. technol. innov.

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The main objective of this study is to develop the advanced composites for civil engineering applications as material for the building industry, especially for an insulation purpose. The research processes include several steps. Firstly, the prototype elements, such as bricks and elevation elements were performed from eco-friendly composite -flax fiber reinforced geopolymer. The elements were designed to take into consideration for environment. Geopolymers are environmentally friendly, sustainable, and resource efficient, including energy demand. Next, the wall was built from these elements and exposed during the three months in a relevant environment. The main conclusion of the research is that the kind of fibers is important for the mechanical properties of the composite, including the fact that for those different fibers could be more beneficial for different raw materials, giving higher strength properties. The significant influence on the mechanical properties of the composites has the adhesion between fiber and material used as a matrix. The adhesion depends among others on the previous treatment of the fibers.

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Geopolymer foams: An overview of recent advancements

Cited by 191 publications

References 189 publications

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

Impact of Flax Fiber Reinforcement on Mechanical Properties of Solid and Foamed Geopolymer Concrete

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