The investigation on the structure and properties of medium cement refractory castable with clinker aggregate

Renata Boris

Doctoral dissertation

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In the thesis, the clinker based medium cement refractory castable (MCC) for use in solid biofuel combustion equipment upon aggressive conditions is discussed upon. For modification of its structure, a mix of carbon and polypropylene fibers and ground quartz sand were used as additives. The aim of the thesis: to investigate and to create a new refractory material – clinker based MCC with the modified phase composition and structure for use in solid biofuel combustion equipments upon aggressive conditions, and to establish the influence of different additives on its structure and properties.

The thesis includes the introduction, three chapters, the general conclusions, the list of reference, the list of publications of the author and four annexes. In the introduction, the problem under the investigation and the topicality of the work are discussed upon, the object of the investigation is described, the aim and the tasks of work are formulated, the research methods, the scientific novelty of the work, the practical significance of its results and the defended statement are described. In the end of the introduction, publications of the author and her reports at conference on the subject of the thesis as well as the structure of the thesis are presented. In the Chapter 1, the data from sources of literature on the peculiarities of using refractory castables in thermal equipment for incineration of alternative fuels are reviewed. In addition, the impact of aggressive operating conditions in thermal equipment for solid biofuel incineration on the properties and durability of various refractory castables is discussed upon. The possibilities of modification of the structure of castable with calcium aluminate cement and the ways for improvement of its properties are reviewed. In the Chapter 2, the raw materials used in the work and their properties, the applied research methods chosen for determining the influence of carbon fiber and ground quartz sand additives on the structures and properties of clinker based MCC are described. In the Chapter 3, the impact of carbon fiber on hydration of calcium aluminate cement (Al2O3 > 70%), on formation of the binder structure at a high temperature and the performance properties of clinker based MCC, such as resistance to explosive spalling, thermal shock resistance, physical and mechanical properties, is examined. In addition, the analysis of the impact of ground quartz sand additive on alkali resistance, abrasion resistance, refractoriness and other properties is presented. Materials of the thesis have been published in six scientific publications and in one licence the results of the research have been presented at eleven scientific conferences held in Lithuania and abroad.

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145×205 mm
124 p.
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