Synthesis and mechanical properties of metakaolinite-based geopolymer

Wang, Hongling; Li, Haihong; Yan, Fengyuan

doi:10.1016/j.colsurfa.2005.01.016

Cited by 374 publications

(189 citation statements)

References 12 publications

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“…These alkali-activated aluminosilicate binders are formed by reacting raw solids which are rich in silica and aluminium with a solution of alkali or alkali salts resulting in a mixture of gels and crystalline compounds that eventually harden into a new strong matrix (Feng et al, 2004). The polycondensation reaction occurs in a high alkaline environment that reorganises aluminium and silica in a more stable Si-O-Al type structure, resulting in materials with high mechanical strength and chemical stability (Wang et al, 2005).…”

Section: Alkaline Activation Of Fly Ashmentioning

confidence: 99%

Deep soft soil improvement by alkaline activation

Cristelo

Glendinning

Pinto

2011

Proceedings of the Institution of Civil Engineers - Ground Impr

152

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This research studied the use of alkaline activation of fly ash, as a silica and alumina amorphous source, to improve soft soils. A laboratory programme -including tests to study strength and deformability development, alternative curing methods, the effect of the different components of the grout, effect of raising initial temperature and comparison with a cement grout -was carried out. Laboratory tests revealed that the use of fly ash and alkaline activator resulted in a soil strength improvement up to 11 . 4, 16 . 7 and 43 . 4 MPa, at 28, 90 and 365 days curing, respectively. The most effective combinations obtained in the laboratory were chosen for the field application with jet grouting. The grout performed adequately to pass standard engineering specifications for soil mixing, achieving up to 26 . 4 MPa at 90 days curing. The main conclusion is the potential of alkaline activation for soil improvement, and therefore this research has created a basis for further studies.

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Section: Alkaline Activation Of Fly Ashmentioning

confidence: 99%

Deep soft soil improvement by alkaline activation

Cristelo

Glendinning

Pinto

2011

Proceedings of the Institution of Civil Engineers - Ground Impr

152

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“…A presença de um zeólito é visível nos espetros das três argamassas, o qual ocorre para o mesmo valor de 2ɵ (31º) embora com diferentes intensidades. Estes costumam ser visíveis em geopolímeros com um elevado teor de água [21]. A Figura 9 apresenta espectros de difração de raios-X de argamassas geopoliméricas elaboradas a partir da composição G1 R3 quer com substituição de argila da Tunisia por metacaulim quer também com substituição da mesma argila por cinzas volantes.…”

Section: Resultsunclassified

Produtos de hidratação em argamassas geopoliméricas à base de argila da Tunísia para reparação de estruturas de concreto

et al. 2016

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A reparação de estruturas degradadas de concreto representa uma oportunidade para a indústria da construção mas também um desafio para a comunidade científica. O desenvolvimento de novas argamassas de reparação constitui por isso uma importante área de investigação. Os geopolímeros são ligantes inovadores alternativos ao cimento Portland pelo que as argamassas à base destes materiais, geopolíméricas, apresentam algumas potencialidades no campo da reparação das estruturas de concreto.O presente artigo apresenta resultados de uma investigação sobre o desenvolvimento de argamassas geopoliméricas à base de uma argila da Tunísia sujeita a tratamento térmico. É incluída uma análise da argila e também dos produtos de hidratação da argamassa os quais apresentam fases geopoliméricas típicas. Palavras-chave: Estruturas de concreto, argamassas de reparação, geopolímeros, argila calcinada, metacaulim ABSTRACTThe rehabilitation of concrete structures represents an opportunity for the construction industry as well as a challenge for the scientific community. The development of new repair mortars is thus an important research area. Gopolymers are innovative binders alternative to Portland cement being that the geopolymeric mortars present some advantages concerning the repair of concrete structures. This paper presents investigations results regarding the development of gepolymeric mortars based on a calcined Tunisian clay. A characterization of the clay is included as well as of the mortars hydration products that show typical geopolymeric phases.Keywords: Concrete structures, repair mortars, geopolymers, calcined clay, metakaolin INTRODUÇÃOOs custos associados à reabilitação de estruturas de concreto a nível mundial apresentam valores astronómicos. Alguns autores [1] referem que só nos Estados Unidos são necessários mais de 1.6 triliões de dólares para obras de reparação destas estruturas. Parte do problema está relacionado com o facto dessas estruturas terem sido construídas quando inexistiam preocupações sobre a durabilidade nem sequer mesmo um conhecimento científico sólido sobre este tema [2].Materiais com baixa durabilidade necessitam de frequentes operações de manutenção e conservação ou mesmo a sua substituição integral o que implica o consumo de matérias-primas e energia com evidente

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“…In particular, the broad bands at about 3435 cm −1 and 1630 cm −1 are due to O-H stretching and bending modes of absorbed molecular water while the band at 1040 cm −1 is due to Si-O stretching and that at about 460 cm −1 is due to Si-O bending vibration. Finally, the bands in the region 800-600 cm −1 are associated to Si-O-Al vibrations [39][40][41][42][43].…”

Section: Ft-ir Analysismentioning

confidence: 99%

Geopolymer Composites for Potential Applications in Cultural Heritage

Ricciotti

Molino

Roviello³

et al. 2017

Environments

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Abstract:A new class of geopolymer composites, as materials alternative to traditional binders, was synthesized and its potentialities as restoration material in Cultural Heritage has been explored. This material has been prepared through a co-reticulation reaction in mild conditions of a metakaolin-based geopolymer inorganic matrix and a commercial epoxy resin. The freshly prepared slurry displays a consistency, workability and thixotropic behavior that make it suitable to be spread on different substrates in restoration, repair and reinforcement actions, even on walls and ceilings. Applicability and compatibility tests on tuff and concrete substrates were carried out and the microstructure of the samples in correspondence of the transition zone was analyzed by means of scanning electron microscope (SEM) observations and energy dispersive spectroscopy (EDS) mapping. Our studies pointed out the formation of a continuous phase between the geopolymer composite and tuff and concrete substrates, highlighting a high compatibility of the geopolymer binder with different kinds of materials. These features indicate a large potential for applications of these materials in Cultural Heritage.

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Synthesis and mechanical properties of metakaolinite-based geopolymer

Cited by 374 publications

References 12 publications

Deep soft soil improvement by alkaline activation

Deep soft soil improvement by alkaline activation

Produtos de hidratação em argamassas geopoliméricas à base de argila da Tunísia para reparação de estruturas de concreto

Geopolymer Composites for Potential Applications in Cultural Heritage

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