Journal ArticleDOI
Chemical stability of cementitious materials based on metakaolin
Ángel Palomo,María Teresa Blanco-Varela,M. L. Granizo,Francisca Puertas,Tomás Vázquez,Michael W. Grutzeck +5 more
TLDR
In this article, the results of a research project initiated to study the stability of these materials when exposed to aggressive solutions were presented, where prisms of mortar made of sand and alkali-activated metakaolin were immersed in deionized water, ASTM sea water, sodium sulfate solution (4.4% wt), and sulfuric acid solution (0.001 M).About:
This article is published in Cement and Concrete Research.The article was published on 1999-07-01. It has received 510 citations till now. The article focuses on the topics: Cementitious & Metakaolin.read more
Citations
More filters
Journal ArticleDOI
Alkali-activated fly ashes: A cement for the future
TL;DR: In this paper, the mechanism of activation of fly ash with highly alkaline solutions is described, and the product of the reaction is an amorphous aluminosilicate gel having a structure similar to that of zeolitic precursors.
Journal ArticleDOI
The Role of Inorganic Polymer Technology in the Development of ‘Green Concrete’
TL;DR: In this paper, the potential position of and drivers for inorganic polymers (“geopolymers”) as an element of the push for a sustainable concrete industry are discussed.
Journal ArticleDOI
Understanding the relationship between geopolymer composition, microstructure and mechanical properties
Peter Duxson,John L. Provis,Grant C. Lukey,Seth W. Mallicoat,Waltraud M. Kriven,Jannie S.J. van Deventer +5 more
TL;DR: In this paper, a mechanistic model accounting for reduced structural reorganization and densification in the microstructure of geopolymer gels with high concentrations of soluble silicon in the activating solution has been proposed.
Journal ArticleDOI
Effect of curing temperature on the development of hard structure of metakaolin-based geopolymer
TL;DR: In this paper, the effect of curing temperature (10, 20, 40, 60 and 80°C) and time on the compressive and flexural strengths, pore distribution and microstructure of alkali activated metakaolin material was analyzed.
Journal ArticleDOI
Do Geopolymers Actually Contain Nanocrystalline Zeolites? A Reexamination of Existing Results
TL;DR: The exact physicochemical nature of the geopolymeric binder phase has never before been determined as discussed by the authors, but it is known that it is composed of agglomerates of nanocrystalline zeolites compacted by an amorphous gel phase.
References
More filters
Journal ArticleDOI
Properties of Metakaolin blended cements
TL;DR: In this paper, the early hydration period of pastes containing metakaolin was investigated using isothermal calorimetry and conductivity, and differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectrometry were used to follow the consumption of calcium hydroxide (CH) and identify the products of reaction.
Patent
Early high-strength mineral polymer
TL;DR: An early high strength mineral polymer composition is formed of a polysialatesiloxo material obtained by adding a reactant mixture consisting of alumino-silicate oxide (Si 2 O 5,Al 2 O 2 ) with the aluminum cation in a fourfold coordination, strong alkalis such as sodium hydroxide and/or potassium hydroxides, water, and a sodium/potassium polysilicate solution; and from 15 to 26 parts, by weight, based upon the reactive mixture of the poly sialatesILoxo polymer of ground blast furnace sl
Journal ArticleDOI
Influence of the starting kaolin on alkali-activated materials based on metakaolin. Study of the reaction parameters by isothermal conduction calorimetry
TL;DR: In this paper, a JAF conduction calorimeter was used to follow metakaolin reaction with NaOH solutions at 45°C with variable solution/solid ratio and NaOH solution concentrations varying from 12 to 18 M.
Journal ArticleDOI
Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS NMR and XPS
TL;DR: By fusion with sodium hydroxide followed by a hydrothermal reaction, fly ash and Alenriched fly ash were converted into Na-X and Na-A zeolites, respectively.
Journal ArticleDOI
Alkaline Activation of Metakaolin An Isothermal Conduction Calorimetry Study
M. L. Granizo,M. T. Blanco +1 more
TL;DR: In this paper, a JAF conduction calorimeter was used to follow the reaction of metakaolin with NaOH solutions, which is an exothermic process involving three steps: an initial and very fast process of dissolution, followed by an induction period in which the heat exchange rate decreases, and finally an exthermic step of reaction reactivation in which cementitious materials precipitate.