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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TL;DR: In this article, the microsilica influence on the phase constitution of the composite mixture, containing calcium aluminate cement and spinel-forming reagents, after firing at 17,000C was investigated.
Abstract: Experience in using low cement alumina-magnesia castables, containing spinel-forming reagents, in monolithic ladle linings identified their significant advantages in terms of thermomechanical properties, corrosion resistance and slag resistance. A particular feature of these castables is the synthesis of «in situ» magnesium aluminate spinel at high operating temperatures, which provides increased operational lifetime of the lining.The microsilica influence on the phase constitution of the composite mixture, containing calcium aluminate cement and spinel-forming reagents - calcined alumina and sintered periclase after firing at 17000C was investigated in the paper. It was found that as a result of the interaction of cement calcium aluminates with microsilica, fusible compounds - anorthite and helenite that, at increased microsilica content, impair physical and technical properties of the composite are formed. It was determined that the ratio of spinel-forming reagents and content of the silica-containing material in a matrix component of alumina-magnesia castables is a more important factor of the synthesis of high-melting-point crystalline phases than the microsilica content. Directed regulation of the phase constitution of the matrix component of alumina-magnesia castables by adjusting the grain-size composition of spinel-forming reagents and their optimal ratio will ensure achieving a set of the given physical and technical characteristics of concrete and increasing the operational lifetime of monolithic ladle linings.
TL;DR: In this paper, the authors present the development of the multiple quantum magic angle spinning (MQ-MAS) method that provides high resolution isotropic spectra for half integer quadrupolar nuclei such as 27Al or 17O for describing the local structure of crystalline or amorphous materials.
Abstract: The recent development of the multiple quantum magic angle spinning (MQ-MAS) method that provides high resolution isotropic spectra for half integer quadrupolar nuclei such as 27Al or 17O gives increased resolution in describing the local structure of crystalline or amorphous materials. This is especially the case for 27Al in aluminium bearing phases of cement interest. This contribution rapidly describes the different high resolution techniques, their acquisition and processing and shows examples of applications to aluminates, calcium aluminates and strontium aluminates.
Patent•
11 Jun 2020
TL;DR: A powdered quick-setting agent containing calcium aluminates and sodium silicate, and furthermore preferably containing at least one selected from the group consisting of alkali metal sulfates, alkaline earth metal sulfate, and aluminum sulfate.
Abstract: A powdered quick-setting agent containing calcium aluminates and sodium silicate, and furthermore preferably containing at least one selected from the group consisting of alkali metal sulfates, alkaline earth metal sulfates, and aluminum sulfate.