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Development of Self-leveling Screed Based on the Ternary Binder System
Běťák, Rostislav ; Vojtek, Miroslav (referee) ; Gazdič, Dominik (advisor)
The thesis deals with the development of self-leveling cement screed with compensated shrinkage. It is a ternary binder system with the majority of portland cement, that in the beginning of setting and hardening form an expandable folder ettringite. At first there was a background research of volume changes of hydrating cement composites and methods for measuring these changes. Various sort of expansion additives were also introduced, the main emphasis was on concepts of calculated formation of ettringite, which are typical for self-leveling underlayment. Background research included the issues of formation of ettringite, influences on it’s nucleation and it’s stability. The practical development of the screed began by measuring volume changes of different pastes on a ternary composition. Selected formulations suitable for use are verified together with additives to semi-application tests. After the final configuration of the screed mixture, there was a test in real application of an representative area. Individual formulations were tested in terms of long-term stability of ettringite in dry and moist environments.
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Development of Composite Mortar and Cement Mixtures
Hlavinková, Eva ; Gemrich, Jan (referee) ; Fridrichová, Marcela (advisor)
This diploma thesis deals with the design of composition and the study of properties of the ternary binding system based on purposeful ettringite formation, which was subsequently used for the preparation of self-leveling floor materials, specifically self-levelling underlay and thin-layer floor screed. In the designed compositions of the mixtures is then focused attention on optimizing the dosage of two kinds of plasticizer agents, followed by assessing their impact on the technological properties of these materials.
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