Topic
Calcium aluminates
About: Calcium aluminates is a research topic. Over the lifetime, 490 publications have been published within this topic receiving 9200 citations.
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27 Dec 2004
TL;DR: In this article, it was claimed that steel contains (mass %) carbon 0.07-0.30, manganese 0.35-1.00, silicium 0.15- 0.50, copper 0.05-0, zinc 0.01-0., aluminium 0.04-0; sulfur 0.010; phosphorus 0.020; calcium 0.0.
Abstract: FIELD: metallurgy, in particular steel excellent in resistance to corrosion and seamless casing. ^ SUBSTANCE: claimed steel contains (mass %) carbon 0.07-0.30; manganese 0.35-1.50; silicium 0.15-0.70; chromium 0.05-1.00; nickel 0/05-0.50; copper 0.05-0.50; aluminium 0.01-0.05; sulfur <=0.010; phosphorus <=0.020; calcium 0.0008-0.0020; and balance: iron and inventible impurities including oxygen. Steel has grain number not more than 8. Content of carbon, manganese and silicium satisfies the formula: 2[C]+0.1[Mn]+0.4[Si]<0.63. Content of calcium aluminates is at most 3 inclusion/mm3; oxygen content is at most 0.3 in respect to aluminium, and sulfide number is at most 1.0. Steel of present invention is useful for production of pipe installation for transport of aggressive media. ^ EFFECT: steel with improved corrosion resistance, viscosity and cold resistance. ^ 3 cl, 1 tbl
9 citations
TL;DR: In this paper, developpement de formulations de betons refractaires pouvant supporter de hautes temperatures, consistant en alumine et en aluminate de calcium avec differents rapports Al 2 O 3 /CaO.
Abstract: Developpement de formulations de betons refractaires pouvant supporter de hautes temperatures, consistant en alumine et en aluminate de calcium avec differents rapports Al 2 O 3 /CaO. On etudie leur valeur de PCE, leur dilatation thermique et a l'humidite, leur retrait au sechage, leur resistance a la compression et leurs diffractogrammes RX
9 citations
TL;DR: In this article, the effects of adjusting gypsum contents in blended, interground, fly ash cements were examined to examine the effects on sulfate resistance and compressive strength.
Abstract: Th objective of this study was to examine the effects of adjusting gypsum contents in blended, interground, fly ash cements. The adjustments in gypsum content were expected to affect sulfate resistance of the concrete by increasing the availability of sulfate ions during the hydration of calcium aluminates. In addition to studying the effects of gypsum content on sulfate resistance, its effects on mixing water requirements, compressive strength, and permeability were observed. The sulfate resistance of concrete containing Type II cement and high-calcium fly ash was improved by increasing the total gypsum content of the blended cements. The increases also caused increased mixing water requirements and decreased compressive strengths. The permeability of concrete was not affected significantly. The blended cement containing one of the two high-calcium fly ashes was particularly effective in improving the sulfate resistance with the increased gypsum contents.
9 citations
TL;DR: In this paper, the authors investigate exactly what the crystal habit and morphology are on the fourteenth day of hydration of calcium alumi-nates, and what their role is in the development of compressive strength of the hydrated samples.
Abstract: phase [2–4]. Many researchers [5–7] have investi-gated the development of these hydrated phases byelectron microscopy. The effects of crystal morphol-ogy on the hydration characteristics and setting timehave also been studied by some workers [8–9]. Theaim of the work reported here is to investigateexactly what the crystal habit and morphology are onthe fourteenth day of hydration of calcium alumi-nates, and what their role is in the development ofcompressive strength of the hydrated samples.Calcium aluminates such as CA, CA
9 citations
01 Jan 2016
TL;DR: In this article, the effect of oxygen partial pressure on Cr(VI) formation in low cement Cr2O3-containing refractory castables was examined by reacting pre-synthesized calcium aluminate phases (C3A, C12A7, CA and CA2) with Cr 2O3 at 1300°C.
Abstract: Cr(VI) formation in low cement Cr2O3-containing refractory castables was examined by reacting pre-synthesized calcium aluminate phases (C3A, C12A7, CA and CA2) with Cr2O3 at 1300°C. In order to investigate the effect of oxygen partial pressure on Cr(VI) formation, experiments were conducted in both air and in a CO2 atmosphere. XRD results indicated that the Cr(VI)-containing phase Ca4Al6CrO16 formed in all the examined samples in air, while a Cr(III)-containing phase Ca6Al4Cr2O15 formed in samples (C3A+Cr2O3) and (C12A7+Cr2O3) in CO2. Cr(VI) in the samples was extracted according to the TRGS 613 standard method, and then quantified using the diphenylcarbazide spectrophotometric method. The amount of water soluble Cr(VI) exceeded the allowable EPA U.S. limit of 5 mg/l only in samples (CA+Cr2O3) and (CA2+Cr2O3) in air.
9 citations