Geopolymer-zeolite composites: A review

Rożek, Piotr; Król, Magdalena; Mozgawa, W.

doi:10.1016/j.jclepro.2019.05.152

Cited by 262 publications

(77 citation statements)

References 186 publications

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“…Geopolymers are attractive for industrial applications from several perspectives: environmental protection (decrease of CO 2 emission and energy consumption during the production process), the effectiveness of the manufacturing process and the simplicity of application [1,2]. They have low levels of shrinkage and high adhesion interaction to such materials as concrete, steel, glass and ceramics, and they have attractive mechanical properties and possibilities for application in different conditions because of their chemical resistance to atmospheric conditions and to a variety of acids, salts and fire [3,4].…”

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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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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“…Two factors related to the zeolite presence in a geopolymer matrix affect the compressive strength, where one is the amount of zeolites, and the second is the zeolite crystallite size. Their growth causes the decrease in the compressive strength of the composite [2]. The relatively high strength of the obtained samples with zeolites suggest that these factors are at the levels which can be borne by a geopolymer matrix without causing its weakening.…”

Section: Characterization Of Alkali-activated Claysmentioning

confidence: 92%

“…The activation is conducted by treating the material with an alkaline solution, and keeping for an appropriate time at an elevated temperature. This method of obtaining zeolites is well known, and has been used since many years; however, an improvement of its parameters is still the subject of research [2]. Depending on the used parameters, geopolymer gel and zeolites can be found among the reaction products.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Activation of Kaolin Group Minerals

et al. 2020

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Zeolites can be obtained in the process of the alkali-activation of aluminosilicate precursors. Such zeolite–geopolymer hybrid bulk materials merge the advantageous properties of both zeolites and geopolymers. In the present study, the effect of the type and concentration of an activator on the structure and properties of alkali-activated metakaolin, and metahalloysite was assessed. These two different kaolinite clays were obtained by the calcination of kaolin and halloysite, and then activated with sodium hydroxide and water glass. The phase compositions were assessed by X-ray diffraction, the microstructure was observed via scanning electron microscope, and the structural studies were conducted on the basis of the infrared spectra. The structure and properties of the obtained alkali-activated materials depend on both the type of a precursor and the type of an activator. The formation of zeolite phases was observed when the activation was carried out with sodium hydroxide alone, or with a small addition of water glass, regardless of the starting material used. The higher proportion of silicon in the activator solution does not give crystalline phases, but only an amorphous phase. Geopolymers based on metahalloysite have better compressive strength as the result of the better reactivity of metahalloysite compared to metakaolin.

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“…Geopolymer is a kind of inorganic amorphous aluminosilicate polymer, which is produced by alkali‐activated natural or synthetic aluminosilicate materials (metakaolin, fly‐ash, other industrial wastes, etc) at room temperature 13,14 . Since discovered by J. Davidovits in 1970s, 15,16 it is applied in industrial fields attributing to its good mechanical and chemical properties, and durability. Different from traditional Ordinary Portland Cement, it has a three‐dimensional aluminosilicate phase, which formed by tetrahedral Al 3+ and Si 4+ sites with alkali cations (K + , Na + , Cs + ) 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Yan

Zhang

et al. 2020

Int J Applied Ceramic Tech

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A lightweight hybrid geopolymer foams reinforced with carbon nanotubes (CNTs) was exploited by adding the CNTs into geopolymeric matrix through hydrogen peroxide method. The synergistic effects of nanotubes and foaming agent on the phase evolution, microstructure, and mechanical properties were investigated. After introduction of nanotubes, the geopolymer foams reinforced with CNTs (CNTs/KGP) still showed amorphous structure. Porosity of the foams increased with the H2O2 content and decreased with the increase in CNTs content. The addition of CNTs (1‐9 wt%) in foams refined the distribution of pore size from 523 to 352 μm. Compression strength of the CNTs/KGP samples elevated with the increasing content of CNTs, which was contributed to the crack propagation and bridging of CNTs in foams. The CNTs/KGP foams with considerable porosity show potential applications in adsorption, filtration, membrane supports, other industries, etc

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Geopolymer-zeolite composites: A review

Cited by 262 publications

References 186 publications

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

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

Alkaline Activation of Kaolin Group Minerals

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

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