Journal ArticleDOI
Calorimetric study of alkaline activation of calcium hydroxide–metakaolin solid mixtures
Santiago Alonso,Ángel Palomo +1 more
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In this paper, a series of metakaolin mixes were activated in 1:1 proportion, with different sodium hydroxide concentrations: 5, 10, 12, 15 and 18 M at 45°C during 24 hours.About:
This article is published in Cement and Concrete Research.The article was published on 2001-01-01. It has received 289 citations till now. The article focuses on the topics: Hydroxide & Calcium hydroxide.read more
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Geopolymer technology: the current state of the art
Peter Duxson,Ana Fernández-Jiménez,John L. Provis,Grant C. Lukey,Ángel Palomo,J.S.J. van Deventer +5 more
TL;DR: A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali activation of aluminosilicates as mentioned in this paper.
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Mechanism of geopolymerization and factors influencing its development: a review
Divya Khale,Rubina Chaudhary +1 more
TL;DR: In this paper, the authors present the work carried out on the chemical reaction, the source materials, and the factor affecting geopolymerization, and demonstrate that certain mix compositions and reaction conditions such as Al2O3/SiO2, alkali concentration, curing temperature with curing time, water/solid ratio and pH significantly influences the formation and properties of a geopolymers.
Journal ArticleDOI
The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation
TL;DR: In this paper, the effects of ground granulated blast furnace slag (GGBFS) on the microstructure and mechanical properties of metakaolin (MK) based geopolymers were studied.
Journal ArticleDOI
Alkali-activated binders: A review: Part 1. Historical background, terminology, reaction mechanisms and hydration products
TL;DR: Alkali-activated binders have emerged as an alternative to OPC binders, which seems to have superior durability and environmental impact as mentioned in this paper, and the proper terminology to designate these new binders will be discussed.
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.
References
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Properties of geopolymer cements
TL;DR: In this article, the authors proposed a structural model for high-tech Geopolymer K-Poly(sialate-siloxo) binders, which is similar to that of zeolites and feldspathoids.
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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
TL;DR: 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).
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Alkaline Activation of Metakaolin: Effect of Calcium Hydroxide in the Products of Reaction
TL;DR: In this article, metakaolin (MK) and (MK + Ca(OH) 2 ) mixes were activated with 5M and 12M NaOH solutions and cured at 45°C.
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Location of Aluminum in Substituted Calcium Silicate Hydrate (C‐S‐H) Gels as Determined by 29Si and 27Al NMR and EELS
TL;DR: In this paper, the location of Al substituting in a semicrystalline C-S-H gel present in a hydrated synthetic slag glass was found to contain mainly pentameric silicate chains in which the central silicon is substituted by aluminum.
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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.