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. The mechanical strength and…
Cement
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2,244 papers
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The microscopic study of a set of alkali-activated and thermally cured fly ash samples enabled the authors to establish a descriptive model for the microstructural development of fly ash-based cementitious geopolymers. The morphology of most fly ash…
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High-performance materials for construction, waste immobilisation and an ever-growing range of niche applications are produced by the reaction sequence known as 'geopolymerisation'. In this process, an alkaline activating solution reacts with a…
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This paper assesses the mechanical and durability performance of concretes produced using alkali silicate-activated ground granulated blast furnace slag as sole binder. Alkali-activated concretes are formulated with 300, 400 and 500 kg slag per m3…
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The excellent anticorrosion property of geopolymers in sea water and their efficient bonding to hardened cement paste did not only depend on the chemical compositions but were also influenced by the microstructure. This study presents an…
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This book deals with the chemistry of the principal silicate and aluminate cements used in building and civil engineering. It is a completely re-written successor to the two volumes on 'The Chemistry of Cements' that I edited in 1964, and, like…
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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. The fundamental chemical and…
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This paper summarizes current knowledge about alkali-activated binders, by reviewing previously published work. As it is shown in Part 1, alkali-activated binders have emerged as an alternative to (ordinary Portland cement) OPC binders, which seem…
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Preparation of this article entailed authors analyzing the contents of quite a number of papers, although the main objective was never to review the state of the art of new cements. Rather authors intend to discuss why they believe alkaline…
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Geopolymers are generally believed to provide good fire resistance due to their ceramic-like properties. Previous experimental studies on geopolymer under elevated temperatures have mainly focused on metakaolin-based geopolymers. This paper presents…
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This paper describes research into the use of granulated blast furnace slag as an active filler in the making of geopolymers. During this work it was found that geopolymer setting time correlates well with temperature, potassium hydroxide…
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Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated blast furnace slag (GGBFS) and are named,…
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The activation of fly ash/slag pastes with NaOH solutions have been studied. The parameters of the process studied are: activator concentration (NaOH 2 and 10 M), curing temperature (25C and 65C), and fly ash/slag ratios (100/0, 70/30, 50/50, 30/70,…
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The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order…
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The micro- and nano-structural characteristics of the reaction products of fly ash alkali activation depend, among others, on the curing conditions used: temperature, time and relative humidity. The present study focuses primarily on relative…
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The phys. evolution of materials during heating is a crit. factor in detg. their suitability and performance for applications ranging from construction to refractories and adhesives. The effect of different cations (sodium and potassium) on the…
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Seeding of hydroxide-activated geopolymer syntheses with high surface area Al2O3 nanoparticles causes significant changes both in the kinetics of the reaction and in the structures of the products formed, as shown by in situ and ex situ ATR-FTIR…
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Coatings can extend the service life of concrete structures exposed to marine environments by inhibiting the intrusion of corrosive ions. In the present paper, the possibility of using geopolymer as an innovative inorganic coating for marine…
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Infrared spectroscopic techniques were used in the present study to acquire a deeper understanding of mid-range order in the alkaline aluminosilicate (zeolite precursor) formed in the alkali activation of fly ash. Experiments were conducted with…
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The alkali activation of waste materials (especially those coming from industrial and mining activities) has become an important area of research in many laboratories because it is possible to use these materials to synthesize inexpensive and…
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