Global ETD Search
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Showing 1 to 20 of 20 for “"Calcium aluminate"”.
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Effect of Processing on Electrical Properties of Calcium Aluminate-Based Chemically Bonded Ceramics
Embargo set by: Seth Robbins for item 72339 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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The Application of Melatonin and Platelet-Rich Plasma in the Development of a Bioactive Calcium Aluminate Bone Regenerative Scaffold
… to natural bone using the ceramic biomaterial calcium aluminate (CA). Calcium aluminate materials are durable and remain moldable for an extended period of time at room temperature. Further, the surfaces of CA scaffolds can be modified with biological agents through simple chemical means to …
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An Investigation of the Rheology of Reactive and Nonreactive Highly Filled Polymer Systems
… polymer phases were studied in addition to two calcium aluminate cement-polymer systems of technological interest. The relaxation modulus of the three model reactive systems showed distinguishable signatures of modulus growth characteristic of the active stiffening mechanism in each case. The …
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Processing-property characteristics of a polymer-cement composite
… morphology and mechanical attributes of hardened calcium aluminate cement-poly(vinyl) alcohol (CAC-PVA) composites. Effects of cement particle size and polymer molecular weight were also investigated.
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Synthesis and characterization of novel polymer-ceramic nanocomposites: Organoceramics
… based on various water soluble polymers and calcium aluminate hydrates. Synthesis of these materials involves the aqueous precipitation of the inorganic crystals in the presence of polymer. The presence of polymer during crystallization often leads to changes in particle morphology, and in …
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Volumetric dimensional changes of luting cements
… to be marketed in the US, is composed of calcium aluminate and glass ionomer. CM is a luting agent indicated for permanent cementation of cast restorations, all-zirconia or all-alumina crowns, and prefabricated metal and cast dowel and cores. The manufacturer claims that the cement has …
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Acid resistance of sewer pipe concrete
… commonly encountered in South African sewers. Calcium sulphate, which precipitates in a sulphuric acid solution and masks further attack, is eliminated simulating the constant dissolution of the precipitate at the average daily sewage level region and loosely attached precipitate in the …
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The effect of carbon monoxide and steam on stainless steel fiber reinforced refractory castables
… A series of high and intermediate alumina calcium-aluminate bonded castables was prepared containing several commercial stainless steel fibers. Compressive strength and abrasion resistance of the castables were measured after exposure to high pressure carbon monoxide and steam at 500ºC. …
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Analysis of slurry composition for the direct ink writing of mayenite electride for use in thermionic cathodes
… hollow cathodes. Mayenite electride, a calcium aluminate ceramic with a cage-like lattice structure that traps in electrons, has been identified as a low-work function ceramic that could be used for these thermionic cathodes. This thesis explores an additive manufacturing (AM) process …
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Preparation and characterization of new porous ceramic filters for hot gas clean-up
… elements were successfully fabricated from calcium aluminate cement, calcined fireclay aggregate, and organic pore formers using refractory concrete casting techniques. Methods used to characterize the porous ceramic filter elements included determination of pore size and distribution, …
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Alkali attack of coal gasifier refractory linings
… predicted. For both 53% and 72% alumina cement, calcium aluminate (CaO•Al₂O₃) is decomposed by the reactions CaO•Al₂O₃ + 2Na + 1/20₂ = Na₂O•Al₂O₃ + CaO CaO•Al₂O₃ + 2K + 1/20₂ = K₂O•Al₂O₃ + CaO or CaO•Al₂O₃ + 2Na + l/2S₂ = Na₂0•Al₂O₃ + CaS CaO•Al₂O₃ + 2K + 1/2S₂ = K₂•Al₂O₃ + CaS
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The approach to equilibrium of mixtures of CaO, A1₂O₃, and SiO₂ heated to various temperatures
… 1400°C progress from the binary compounds of dicalcium silicate and calcium aluminate to binary compounds of higher silica and alumina contents, respectively, until gehlenite and anorthite are formed. (5) The introduction of incompatible phases such as wollastonite and mullite does not deter the …
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Deoxidation mechanisms in liquid steel.
… aluminium, titanium, silicon, zirconium and a calcium-aluminium alloy.After the addition of the deoxidant, the total oxygen concentrations of all melts rapidly decreased corresponding with a decrease in the size and number of inclusions observed. This continued to a plateau level of total …
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Lime Stabilised Murram as a Building Material in Kenya
… of lime with murram results in the formation of calcium silicate-aluminate hydrate (C 2ASHg) and carbonate substituted calcium aluminate hydrate (C4ACo.5H12^ When gypsum is present the principal reaction * product is ettringite which is a calcium sulpho-aluminate hydrate (C3A3CSH32 ).
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Relationship between decomposition level and induced solidification of peat based on laboratory investigation
… shows that over time, the peat was filled with calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH) which were products of cement hydration. The strength gain for fabric peat is 157 kPa, while hemic peat, 737 kPa and sapric peat, 121 kPa. It is concluded that regardless the peat …
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Fundamental Understanding of NOx Sequestration Capacity And Pathways in Nano-TiO2 Engineered Cementitious Materials
… blue photodegradation efficiencies than calcium aluminate cement (CAC) samples. The difference indicates that different NOx sequestration pathways occurred in these cements and are likely due to differences in chemical composition and hydrated cementitious phases. For TiO2-coated …
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Composition and microstructure of concrete mixtures subjected to biogenic acid corrosion and their role in corrosion prediction of concrete outfall sewers
… entails simultaneous destruction of the calcium hydroxide (CH) in the hydrated cement paste (HCP) and substituting a larger molecule of calcium sulphate into the concrete matrix thus causing pressure and spalling of the adjacent concrete and aggregate particles. In addition, the calcium …
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Biogenic acid corrosion of sewer concretes with different binders: in-situ and model studies, with advancement of the life factor prediction method
… (SCMs). However, other binder systems such as Calcium Aluminate Cement (CAC) and Calcium Sulpho-Aluminate cement (CSA) have been less studied, despite showing higher potential in suppressing biogenic corrosion. Furthermore, most biogenic prediction models cannot effectively predict the …
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Studium objemových změn pojivových silikátových směsí
V teoretické rovině je tato práce věnována metodám měření a principům objemových změn malt a betonů. Důraz je kladen na cementové samonivelační podlahové hmoty s počáteční kompenzací smrštění. V praktické části je práce věnována rozvoji prototypního měřícího systému určeného pro bezkontaktní …
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ΠΑΡΑΓΩΓΗ ΑΙΘΥΛΕΝΙΟΥ ΜΕ ΚΑΤΑΛΥΤΙΚΗ ΑΤΜΟΠΥΡΟΛΥΣΗ Κ-ΕΞΑΝΙΟΥ
IN THIS THESIS IT WAS STUDIED THE PRODUCTION OF ETHYLENE IN THE PRESENCE OF CATALYSTS VIA STEAM CRACKING OF N-HEXANE. VARIOUS TYPES OF CATALYSTS WERE PREPAREDAND TESTED IN AN EXPERIMENTAL PYROLYSIS UNIT. THE CATALYST SAMPLE WITH THE COMPOSITION 12CAO7AL2O3 SHOWED THE HIGHEST SELECTIVITY IN RELATION …