Mixed Alkali Regional Metakaolin‐Based Geopolymer

SáRibeiro, Ruy A.; SáRibeiro, Marilene G.; Sankar, Kaushik; Kutyla, Gregory P.; Kriven, Waltraud M.

doi:10.1002/9781119321811.ch12

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…The fracture surfaces of the LMK-based GPs presented in Figure 8 were typically those of the MK-based GPs. [22][23][24][25][26][27] EDS spectral analyses confirmed the EDXRF results that the major elements present in the NaLMK500, and NaLMK500GM GPs were, respectively, Na, Si, Al, Fe, and K.…”

Section: Geopolymer and Geopolymer Granite-marble Microstructural Ana...supporting

confidence: 67%

Lateritic soil geopolymer composites for ceramics and engineering construction applications

Ribeiro

Sardela

Keane

et al. 2022

Int J Applied Ceramic Tech

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Characterization of an Amazonian, laterite‐doped, kaolinitic soil (LK) or “lateritic soil” and laterite‐doped metakaolin (LMK) calcined at two distinct rates, as well as granite‐marble (GM) particulate industrial wastes was performed by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X‐ray diffraction (XRD), energy dispersive X‐ray fluorescence (XRF) spectrometry, and particle size and distribution analysis. In addition, an LMK geopolymer (GP) and a lateritic metakaolin‐based GP reinforced with granite‐marble composite (LMKGP‐GM) were tested for water resistance and for mechanical strength. XRD and XRF were used to investigate the composition of the composite materials, while XRD confirmed the formation of GP. Just as in the case of highly reactive commercial metakaolin used in construction, according to this study, lateritic soil‐based metakaolin presented similar characteristics. Therefore, it could be used in the development of more sustainable ceramics and construction materials, including the use of GM waste as a reinforcing phase/aggregate.

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Section: Geopolymer and Geopolymer Granite-marble Microstructural Ana...supporting

confidence: 67%

Lateritic soil geopolymer composites for ceramics and engineering construction applications

Ribeiro

Sardela

Keane

et al. 2022

Int J Applied Ceramic Tech

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“…It improves the durability of the resultant binder by reacting with calcium hydroxide to form hydrated calcium aluminates and silicon aluminates. Amazonian MK GP composites have been recently tested and confirmed as a potential green construction material [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Ribeiro

Kutyla

et al. 2019

Advances in Materials Science and Engineering

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To determine the viability of using a local resource for geopolymer synthesis, geopolymers were synthesized using metakaolin made from clay mined in the Amazonian region of Brazil. Samples were made with mixed potassium-sodium and pure sodium metakaolin-based geopolymer. Samples were also made using commercial metakaolin (CMK) from BASF, Inc. as a comparison to the Amazonian metakaolin (AMK). Scanning electron microscopy was used to investigate the microstructure of the materials. X-ray diffraction was able to confirm the formation of geopolymer. The mechanical properties of AMK material were nearly equivalent to those based on CMK. Neither CMK nor AMK reacted completely, although samples made with CMK showed less unreacted material. By increasing the mixing intensity and duration, the amount of residual unreacted material was substantially reduced, and mechanical properties were improved.

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“…Regional and local materials have been used in the production of geopolymer (GP) composites to reduce envi-ronmental impacts and raise their practicality in different conditions. [1][2][3][4][5][6] Researchers have used metakaolin (MK) from different parts of the world to synthesize GPs. 7 MK has the main components of SiO 2 and Al 2 O 3 in mass percentages ranging from 44.4%-73% and 14.5%-47.43%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Regional and local materials have been used in the production of geopolymer (GP) composites to reduce environmental impacts and raise their practicality in different conditions 1–6 . Researchers have used metakaolin (MK) from different parts of the world to synthesize GPs 7 .…”

Section: Introductionmentioning

confidence: 99%

Regional metakaolin particle size reduction for higher strength geopolymer

Sa Ribeiro,

Keane

et al. 2024

Int J Applied Ceramic Tech

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The objective of this project was to further develop new composites and a testing program for the performance‐based specification for natural Amazonian geopolymer (GP) for use in ceramics and construction. While fly ash‐based alkali activated materials are now an established technology, metakaolin‐based GPs still need to be developed and optimized regarding the knowledge of the specific characteristics and properties of local resources. Amazonian kaolin was calcined into metakaolin (AMK). AMK particle size reduction for better reactive material was evaluated by means of dry and wet ball milling and sieving. Three types of metakaolin were analyzed for particle size distribution, and their size d50 ranged from 7.9 to 2.8 µm. Further GP characterization followed physical and mechanical properties in flexural strength tests. In addition, scanning electron microscopy and energy dispersive spectroscopy were used to investigate the microstructure of the materials. Energy dispersive X‐ray fluorescence was used to measure the GP material composition. Analysis of the results revealed that the strength and stiffness of sodium–metakaolin‐based GP were inversely proportional to particle size. All distinct particle size GPs showed, in general, some increase in strength and stiffness within curing times ranging from 3 to 28 days.

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Mixed Alkali Regional Metakaolin‐Based Geopolymer

Cited by 5 publications

References 14 publications

Lateritic soil geopolymer composites for ceramics and engineering construction applications

Lateritic soil geopolymer composites for ceramics and engineering construction applications

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Regional metakaolin particle size reduction for higher strength geopolymer

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