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Showing 1 to 20 of 37 for “"Metakaolin"”.
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Nucleation seeding in metakaolin geopolymers
… was to prove and study the nucleation step in metakaolin-sodium hydroxide (MK-NaOH) geopolymer formation. The objective was accomplished by adding silica, titania, synthesized zeolite A and zeolite X nanopowders as external seeds in MK-NaOH geopolymers. Isothermal calorimetry revealed that the …
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Setting and nanostructural evolution of metakaolin geopolymer
… using a relatively pure aluminosilicate metakaolin precursor. Prior to probing nanostructural evolution, a combination of water treatment to extract soluble species and solvent treatment to extract water was developed for use to stop the geopolymer formation for early-age geopolymers with …
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Properties of Western Cape concrete with metakaolin
… Therefore, an alternative SCM such as metakaolin, which is obtained from calcination of kaolin clay, is a potential solution to SCM availability fluctuation, especially in the Western Cape construction industry which depends on the use of Corex slag (GGCS) from a source that can be …
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Characterization of the Smart Oilwell Cement Modified with Metakaolin
… and hardened cement. In this study up to 10% Metakaolin was used. Metakaolin increased the initial resistivity of cement by 25%, the piezoresistive behavior of the cement increased by about 60% and the cement compressive strength improved by about 20%. Contamination can be detected by means of …
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An Experimental and Numerical Study on Metakaolin-based Geopolymers
… by mixing an aluminosiliceous powder such as metakaolin (MK) with an alkaline solution. Several parameters such as composition and curing conditions influence the characteristics of GPs, and appropriate selection of material proportions is necessary to achieve the desired performance. This …
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Structural Evolution and Ceramic Formation in Metakaolin-Based Geopolymers
Geopolymers are increasingly being considered in a variety of refractory applications and as precursors to ceramic formation. However, fundamental details regarding their structure, thermal stability, and crystallization on heating are not well understood. In this dissertation, the structural …
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An experimental study of high-performance concrete using metakaolin additive and polymer admixture
… study of high-performance concrete using metakaolin (MK) additive as partial replacement of cement and addition of the Styrene-Butadiene rubber (SBR) and Polyvinyl acetate (PVA), to conduct a novel research to investigate the effectiveness of the additives materials on the performance of …
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Hydration, Pore Development and Chemical Resistance of Metakaolin - Fly Ash - Portland Cement (MK-PFA-PC) Blends
… a waste material / industrial byproduct, with metakaolin (MK), as a partial replacement for Portland cement (PC) in mortar and paste. The influence of various compositions of MK-PFA-PC blends on the resistance to the action of sulphate and synthetic seawater solutions, setting time and heat of …
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Microstructure, Quasi-Static, And High-Strain Rate Dynamic Characterization Of Metakaolin And Fly Ash Based Geopolymers For Structural Applications
… Several types of geopolymer systems such as metakaolin and fly ash based geopolymers are widely used, and are available in different mixture proportions [1, 2]. Metakaolin (Al2Si2O7), a dehydroxylated form of Kaolinite (Al2Si2O5(OH)4) clay readily available from many sources, provides several …
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Understanding effects of silicon/aluminum ratio and calcium hydroxide on chemical composition, nanostructure and compressive strength for metakaolin geopolymers
… the chemical composition and nanostructure for metakaolin geopolymers. The second was to determine how the composition and nanostructure correlate with mechanical properties of the geopolymer. For this study, the geopolymers were made using metakaolin, calcium hydroxide, sodium hydroxide, sodium …
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Advancements in concrete material sustainability : supplementary cementitious material development and pollutant interaction
… reactivity, (ii) can cement renders, containing metakaolin calcined clays, be engineered for passive carbon dioxide and ozone removal, and (iii) how do the specific activity and emanation fractions of concrete constituents, including fly ash and metakaolin, as well as assembled concretes impact …
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Setting and nanostructure of slag-fly ash binders
… be high in SFB. Hence, fly ash was replaced with metakaolin because the latter is more reactive than the former. Since there were many commercial metakaolins available in the market, five of them were characterized using the methods mentioned above. Out of those five metakaolins, two were chosen …
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Durability studies of high performance concrete used for bridge decks
… (SCM), such as fly ash, slag, silica fume and metakaolin as single or combined admixtures; normal Portland cement, chemical admixtures, and WV sources of limestone and gravel. Durability evaluations included: electrical indications of chloride penetration, chloride ion diffusion test, …
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Effect of carbonation on bound chlorides in cementitious and alkali activated binders
… to alkali activated fly ash and alkali activated metakaolin due to the formation of Friedel’s salt and the structure of hydrotalcite to alkali activated fly ash and alkali activated metakaolin, chloride binding was mostly due to physical absorption. The influence of carbonation on the bound …
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Aqueous reactivity of glassy industrial byproducts in alternative cementitious systems
… and industry have both focused primarily on metakaolin and IBs such as blast furnace slag and coal fly ash as supplementary and alternative cementitious precursors.
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Utilising a water-based spraying method to improve 3D printed concrete
… bonding agents), and cementitious suspensions (metakaolin and silica fume) at the interlayer. The performance of these treatments was evaluated under both normal and extended pass times through a suite of mechanical, durability, and microstructural characterisation techniques. Furthermore, the …
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The development of a geopolymer binder from the interbasaltic laterites of Northern Ireland
… Blastfurnace Slag (GGBS), Fly ASH (FA) or Metakaolin (MK) as primary raw materials or precursors. GGBS and FA are both by-products from other processes and as such have a limited longevity of supply. Pure MK is prohibitively expensive. These factors result in limitations being placed on the …
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Synthesis and characterization of geopolymers for infrastructural applications
… by 3 different kinds of raw materials (i.e., metakaolin, mixture of red mud and fly ash, mixture of red mud and rice husk ash) was explored. For geopolymers from identical raw materials, variable parameters involved in the synthesis were examined to investigate the extent and degree of …
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An Investigation of Geopolymers for Use In High Temperature Applications
… Geopolymer concretes synthesized with fly ash, metakaolin, ground glass, and combinations thereof are investigated. To simulate the thermal loading that exists in a core meltdown, GCCs in this study are exposed to impulses of thermal energy. To simulate the effects of a structural fire, …
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CORROSION RESISTANCE PERFORMANCE INVESTIGATION OF MILD STEEL BAR COATED WITH MAGNESIUM PHOSPHATE CEMENT PASTE
… is explored. In addition, one type of additives, metakaolin, and one type of retarder, boric acid, are employed in MKPC to modify its properties in order to further investigate corrosion resistance and to achieve mass-production coating reinforcement at the work site. This coating method may be …
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