Influence on refractory castables properties and structure of composite deflocculant

Irina Demidova-Buizinienė

Doctoral dissertation

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The subject of this dissertation is properties of refractory castable, mixed with different types of deflocculant. Objects of the study are as follow: refractory binding matrix and refractory castable with composite deflocculant. Recently, while new refractory castable producing technologies are being developed, “next generation” deflocculants composed of polycarboxylate esters have been synthetized. These deflocculants are various mixtures of ultradispersive and chemical additives that offer not only deflocculative properties, but also regulate structure formation process. However, the mechanism of structural formation has not been properly investigated yet. Therefore, for successful deflocculant application specific conditions and composed high-quality refractory castable components are needed, which means that for wider deflocculants use further detailed investigations are required. The main objectives of the dissertation are (1) to investigate a mechanism of an action of the composite deflocculant on a refractory matrix structure and (2) to compose long-living refractory castable that would have better resistancy values. Principal tasks of the study are as follow: (1) to investigate, how different types of single or composite deflocculative supplements influence structure formation and hydration processes of refractory binding matrix, composed of aluminate concrete and SiO2 microdust and (2) to investigate the pattern of the impact of composite deflocculative supplements on refractory physical and mechanical characteristics of castable.

The dissertation consists of the following parts: introduction, three chapters, a list of references and author's publications on the topic of the dissertation. The introduction focuses on a subject matter to be examined, current interest in it and scientific novelty of the study. The study describes the object and methods of the research, formulates the objective and tasks, discusses practical importance of the results and states final theses. All dissertation topic-related author's publications and oral presentations are listed and dissertation structure is described at the end of the introduction.

The first chaper of the dissertation reviews relevant literature. It looks over refractory castables and various types of deflocculant.

The second chapter focuses on materials and methods of the research.

The third chapter describes the impact of deflocculants on the structure of refractory binding matrix and refractory castable physical, mechanical properties, and states that there is a trend, due to which it becomes possible to predict refractory castable resistance and other characteristics.

Seven papers have been published on the subject of the dissertation. Seven oral presentations have been made on the subject of the dissertation at local and international conferences. 

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145×205 mm
120 p.
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