Rice husk ash and spent diatomaceous earth as a source of silica to fabricate a geopolymeric binary binder

Mejía, Johanna M.; Gutiérrez, Ruby Mejía de; Capdevila, Carlos

doi:10.1016/j.jclepro.2016.01.057

Cited by 97 publications

(42 citation statements)

References 17 publications

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“…Based on this finding, research has been directed toward the production of alternative silicates to make the geopolymer production process more environmentally sustainable . Several studies have focused on the use of secondary sources of silica that can be obtained from industrial byproducts, such as silica fume (SF), rice husk ash (RHA) and other wastes …”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Villaquirán-Caicedo

Gutiérrez

2018

J Am Ceram Soc

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This paper evaluated mechanical and thermal stability of alkali‐activated materials obtained from metakaolin and alternative silica sources, such as rice husk ash (RHA) and silica fume (SF), and were reinforced with recycled ceramic particles (RP) obtained by grinding bricks. Specimens were produced, and after 7 days of curing, they were exposed to temperatures between 300 and 1200°C to determine the influence that different percentages of RP had on the mechanical behavior and microstructure of the produced composites. The results showed a reduction in the linear contraction by 10.22% with 20 wt% RP and that the reinforcing materials improved the mechanical performance of the geopolymers after exposure to high temperatures; the compressive strengths reached 137.7 (±11.4) MPa after being exposed to 1200°C for the matrix based on RHA and 180.6 (±19.15) MPa after being reinforced with 20 wt% RP. The improvement was mainly due to densification and the formation of crystalline products such as leucite, kalsilite, and mullite.

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Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Villaquirán-Caicedo

Gutiérrez

2018

J Am Ceram Soc

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“…Dentro de los cementos activados alcalinamente es el activador precisamente el que mayor huella de carbono presenta en la mayoría de los casos. Es por ello que en los últimos años han proliferado las publicaciones donde el activador alcalino es generado a partir de un material residual consiguiendo sustituir total o parcialmente el uso de productos comerciales (Bouzón et al, 2013;Mejía et al, 2016;Moraes et al, 2018) Finalmente, este trabajo pretende estudiar el efecto de la incorporación de un geopolímero a una matriz cal/puzolana. Este geopolímero será sintetizado utilizando productos comerciales y también materiales VIIPAT70 -CONPAT 2019, Tuxtla Gutiérrez, Chiapas, México…”

Section: Introductionunclassified

Estudio De Morteros Mixtos Cal/Puzolana-Geopolímero: Resistencia a Compresión Y Absorción De Agua

Villca¹,

Valencia²,

Soriano³

et al. 2019

Memorias Conpat 2019

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RESUMENEl objetivo del trabajo es el estudio de la resistencia a compresión y la absorción de agua de los morteros de cal/FCC donde se sustituye un 30% en peso de este conglomerante por un geopolímero. En dicho geopolímero se ha utilizado como precursor FCC y, como activador, una mezcla de silicato e hidróxido sódicos o bien distintas mezclas de hidróxido de sodio con fuentes de sílice natural y residuales. Los resultados demuestran que la incorporación del geopolímero mejora la resistencia a la compresión y disminuye la absorción de agua por capilaridad. Estos resultados manifiestan la viabilidad de su uso como materiales de construcción alternativos a los morteros tradicionales en aplicaciones donde no se requieran elevadas resistencias mecánicas. ABSTRACTThe aim of this work is studying the compressive strength and the water absorption of lime/FCC mortar where a 30% of weight of this is replaced by a geopolymer. This geopolymer had FCC as a precursor and, as activating reagent, a mix of sodium silicate and sodium hydroxide or different mixes of sodium hydroxide with natural and residual silica sources. Results prove that the compressive strength increases, and the water capillary absorption decreases by adding the geopolymer. These outcomes show the feasibility of their use as alternative construction materials to traditional mortars in applications where high mechanical strength is not required.

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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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Rice husk ash and spent diatomaceous earth as a source of silica to fabricate a geopolymeric binary binder

Cited by 97 publications

References 17 publications

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Estudio De Morteros Mixtos Cal/Puzolana-Geopolímero: Resistencia a Compresión Y Absorción De Agua

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

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