Potassium Geopolymer Reinforced with Alkali‐Treated Fique

Sankar, Kaushik; Kriven, Waltraud M.

doi:10.1002/9781119040293.ch5

Cited by 19 publications

(25 citation statements)

References 9 publications

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“…Davidovits reported that the glassy analogue of akermanite in slag dissolves in NaOH solution and precipitates calcium silicate hydrate (CSH) and Mg(OH) 2 . When glassy gehlenite (with molar Si:Al = 1:2) comes in contact with NaOH, the Al–O–Al sequence in glassy gehlenite slag cleaves.…”

Section: Resultsmentioning

confidence: 99%

“…Stoichiometric geopolymers provide excellent fire resistance, ambient temperature production, excellent strength (compressive and flexural), and a lower carbon footprint into the atmosphere during manufacturing as compared to ordinary Portland cement (OPC) . Furthermore, geopolymers are increasingly being considered as matrices for reinforced composites, a variety of refractory applications, corrosion‐resistant coatings, and as precursors to ceramic formation …”

Section: Introductionmentioning

confidence: 99%

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Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

et al. 2018

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Alkali silicate activated slag and class F fly ash‐based binders are ambient curing, structural materials that are feasible replacements for ordinary Portland cement (OPC). They exhibit advantageous mechanical properties and less environmental impact than OPC. In this work, five sodium silicate activated slag‐fly ash binder mixtures were developed and their compressive and flexural strengths were studied as a function of curing temperature and time. It was found that the strongest mixture sets at ambient temperature and had a Weibull average flexural strength of 5.7 ± 1.5 MPa and Weibull average compressive strength of 60 ± 8 MPa at 28 days. While increasing the slag/fly ash ratio accelerated the strength development, the cure time was decreased due to the formation of calcium silicate hydrate (C–S–H), calcium aluminum silicate hydrate (C–A–S–H), and (Ca,Na) based geopolymer. The density, microstructure, and phase evolution of ambient‐cured, heat‐cured, and heat‐treated binders were studied using pycnometry, scanning electron microscopy, energy dispersive X‐ray spectroscopy (SEM‐EDS), and X‐ray diffraction (XRD). Heat‐cured binders were more dense than ambient‐cured binder. No new crystalline phases evolved through 28 days in ambient‐ or heat‐cured binders.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

et al. 2018

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“…Potassium-based geopolymer reinforced with 6.4 wt.% rice stem yielded 18 MPa three-point flexure strength 12 . Potassium-based geopolymer reinforced with 30 wt.% alkali-treated fique fibers yielded 11 MPa four-point flexure strength 13 . Up to this date, we found no published work on MKGP reinforced with bamboo fibers.…”

Section: Introductionmentioning

confidence: 99%

Mixed Alkali Regional Metakaolin‐Based Geopolymer

SáRibeiro

Sankar

et al. 2017

Developments in Strategic Ceramic Materials II

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In pursuit of sustainable construction, regional natural materials can be used as a base for geopolymer processing. For higher strength achievement, this study uses mixed potassium-sodium geopolymer. Geopolymer was synthesized using metakaolin produced from kaolinite extracted from Amazonian soil, and microscopically compared to a commercial, highly reactive, metakaolin-based geopolymer. Amazonian kaolin was converted into metakaolin by calcination up to 700 °C. X-ray diffraction (XRD) analysis showed the resulting amorphous metakaolin to be 76% pure, with 24% crystalline quartz impurity. Four-point flexural and compressive strength testings of the geopolymer were carried out according to ASTM standards. Scanning electron microscopy was used to investigate the microstructure and the Si/Al ratio. In addition, XRD was used to confirm the formation of geopolymer.

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“…Potassium‐based geopolymer reinforced with 6.4 wt% rice stem yielded 18.4 MPa three‐point flexure strength . Potassium‐based geopolymer reinforced with 30 wt% alkali‐treated fique fibers yielded 11.4 MPa four‐point flexure strength . Up to this date, we found no published work on MKGP reinforced with bamboo fibers.…”

Section: Introductionmentioning

confidence: 99%

Potassium‐Based Geopolymer Composites Reinforced with Chopped Bamboo Fibers

Sankar

Ribeiro

et al. 2016

J. Am. Ceram. Soc.

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Bamboo is a fast-growing, readily available natural material with tensile specific strength equivalent to that of steel (250-625 MPa/g/cm 3 ). In the pursuit of sustainable construction materials, a composite was made with potassium polysialate siloxo geopolymer as the matrix and randomly oriented chopped bamboo fibers (Guadua angustifolia) from the Amazon region as the reinforcement. Four-point flexural strength testing of the geopolymer composite reinforced with bamboo fibers was carried out according to ASTM standard C78/C78M-10 e1. Potassiumbased metakaolin geopolymer reinforced with 5 wt% (8 vol%) untreated bamboo fibers yielded 7.5 MPa four-point flexural strength. Scanning electron microscopy and optical microscopy were used to investigate the microstructure. In addition, X-ray diffraction was used to confirm the formation of geopolymer. the relationships between composition, processing, microstructure, and the properties of metakaolin-based geopolymers (MKGPs) and found that the best compressive strength is obtained when the Si:Al molar ratio is 2:1 in geopolymers. When compared to ordinary portland cement (OPC), geopolymers have faster setting time and lower density. The mechanical properties of geopolymers are superior to portland cement in general, but are influenced by the contents of the liquid phase in the mixture, the curing temperature, and the final porosity of the body. 5 The energy required to produce geopolymer is considerably lower than that required for OPC. The extent of reduction in energy depends upon the raw materials used to make the geopolymer. 7 They are processed as a liquid enabling them to be cast into any shape and cured at ambient or slightly elevated temperatures. However, like ceramics, pure geopolymers are brittle and are weak in tension. Their failure is catastrophic with very little warning signal. On the other hand, they can

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Potassium Geopolymer Reinforced with Alkali‐Treated Fique

Cited by 19 publications

References 9 publications

Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

Mixed Alkali Regional Metakaolin‐Based Geopolymer

Potassium‐Based Geopolymer Composites Reinforced with Chopped Bamboo Fibers

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