Synthesis and characterisation of materials based on inorganic polymers of alumina and silica: sodium polysialate polymers

Barbosa, Valeria F.F.; MacKenzie, Kenneth J.D.; Thaumaturgo, C.

doi:10.1016/s1466-6049(00)00041-6

Cited by 949 publications

(553 citation statements)

References 8 publications

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“…Geopolymer materials are thus characterised by a highly polymerised structure composed principally of threedimensional cross-linked sites such as SiQ 4 (2Al) and SiQ 4 (3Al) units. 9,10 In summary, Portland cement is composed mainly of SiQ 1 and SiQ 2 species, which is consistent with the models proposed previously for the C S H gel. In these models, silicate groups organize in linear finite chains of "dreierketten" structure (principally dimers and also some pentamers and octamers).…”

Section: Si and 27 Al Mas-nmr Analysissupporting

confidence: 90%

“…6 On the other hand, the X-ray pattern of GP sample is very similar to that previously published for geopolymer materials. [8][9][10] X-ray diffraction allows only to say that absolutely no crystalline or semi-crystalline phase is formed in GP, GP-AAS, and AAS materials, which are more amorphous than the C S H gel phase occurring in ordinary Portland cement, with a lack of long-range order. Fig.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…Geopolymeric binders have thus similar chemical composition as natural zeolitic materials but without the extensive crystalline zeolitic structure. [8][9][10] Ordinary Portland cement, alkali-activated slag cement, and geopolymers represent three different cementitious materials with their own characteristics and properties. These three types of materials have been extensively considered in the last 10 years.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

Lecomte

Henrist

Liégeois

et al. 2006

Journal of the European Ceramic Society

465

152

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Section: Si and 27 Al Mas-nmr Analysissupporting

confidence: 90%

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

Lecomte

Henrist

Liégeois

et al. 2006

Journal of the European Ceramic Society

465

152

View full text Add to dashboard Cite

“…This gel was also observed to contain a small amount of alkalis (normally Na), that neutralised the charge imbalance created when a Si is replaced by an Al tetrahedron. Actually, then, these are calcium-sodium aluminosilicate hydrate [C-(N)-A-S-H] gels (70)(71)(72)(73) proposed a model to describe this gel as a mix of cross-linked and non-cross-linked tobermorite-based structures (the cross-linked substituted tobermorite model, CSTM).…”

Section: Fundamentals Of Alkaline Activation In Calcium-rich Systems:mentioning

confidence: 99%

A review on alkaline activation: new analytical perspectives

et al. 2014

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For many years now the idea of including alkalis in a Portland cement matrix has been regarded as a daft or inexcusably erroneous proposition: despite its absurdity, that opinion has been widely accepted as a basic premise by the scientific and technical community working in the area of the chemistry of cement. In 1957 Glukhovsky proposed a working hypothesis in which he established a close relationship between alkalis and cementitious materials. That hypothesis has become consolidated and has served as a basis for developing a new type of binders, initially called "alkaline cements". The present paper reviews the most significant theoretical interpretations of the role played by alkalis in the formation of the "stony" structure of cement. It ends with a broad overview of the versatility of this type of materials for industrial applications and a discussion of the possibility of building on the existing legislation to meet the need for the future regulation of alkaline cement and concrete manufacture. RESUMEN: Activación alcalina: Revisión y nuevas perspectivas de análisis.Hace algunos años, la sola idea de la presencia de álcalis en una matriz de cemento Portland se consideraba casi como una aberración, o como un error imperdonable; convirtiéndose en un postulado básico (absurdo) ampliamente aceptado por la comunidad científica y técnica vinculada a la química de los cementos. En 1957 Glukhovsky propuso una hipótesis en la que se establecía una estrecha relación entre los álcalis y los materiales cementantes. Hoy día nadie duda de que dicha hipótesis ha servido de base para el desarrollo de una nueva clase de materiales cementantes: "cementos alcalinos". En el presente trabajo se hace una revisión sobre los aspectos teóricos más relevantes del papel de los álcalis en la formación de estos conglomerantes. También se da una visión genérica de su versatilidad, desarrollo industrial y estado de la normativa actual para regular en el futuro la fabricación de cementos y hormigones alcalinos.

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“…A new group of promising construction material is geopolymer, first introduced and named by Davidovits in 1989, exhibiting good mechanical performance, durability, and fire and acid resistance. It can be cured and hardened at room temperature with 80%-90% fewer CO 2 emissions than Portland cement [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

et al. 2015

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This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.

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Synthesis and characterisation of materials based on inorganic polymers of alumina and silica: sodium polysialate polymers

Cited by 949 publications

References 8 publications

(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement

A review on alkaline activation: new analytical perspectives

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

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