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Effect of the currently used plasticizers for concrete hydration temperature
Knotová, Kateřina ; Halas, Vladimír (referee) ; Sedlmajer, Martin (advisor)
Plasticizing and superplasticizing admixtures are the key components of nearly every concrete. These admixtures improve workability of mortar and fresh concrete which lead to facilitation of depositing and compaction. Adding of plasticizers or superplasticizers enables to change properties of fresh and hardened concrete, especially to reduce water-cement ratio, thereby increasing strength and durability of concrete or to improve other properties. The main aim of this thesis is to monitor the effect of plasticizing admixtures and their dosage on the rheology and hydration of concrete with emphasis on the development of hydration temperature. The other goal is to examine their strength qualities. Behaviour of plasticizing admixtures is analysed at first on cement pastes, as simple systems, and then verified on concrete.
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Study of the development of short-term strength of concrete at low temperatures
Ďurnek, Jan ; Louda,, Pavel (referee) ; Hela, Rudolf (advisor)
The work deals with the study of the development of compressive strength of concrete at low temperatures. The content of the theoretical part is summarizing of all available information about cements, especially about the properties of cements used for the production of concrete in the Czech Republic. The next chapters deal with plasticizing and super plasticizing additives, which accelerate the hardening and setting of the concrete mixture. A certain part is reserved for the accelerators themselves. The practical part deals with the influence of individual temperatures on the maturation of the concrete mixture, especially on the compressive strength of concrete after 1,2, 7 and 28 days. The conclusion of the work contains an evaluation of the measured results.
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Effect of the currently used plasticizers for concrete hydration temperature
Knotová, Kateřina ; Halas, Vladimír (referee) ; Sedlmajer, Martin (advisor)
Plasticizing and superplasticizing admixtures are the key components of nearly every concrete. These admixtures improve workability of mortar and fresh concrete which lead to facilitation of depositing and compaction. Adding of plasticizers or superplasticizers enables to change properties of fresh and hardened concrete, especially to reduce water-cement ratio, thereby increasing strength and durability of concrete or to improve other properties. The main aim of this thesis is to monitor the effect of plasticizing admixtures and their dosage on the rheology and hydration of concrete with emphasis on the development of hydration temperature. The other goal is to examine their strength qualities. Behaviour of plasticizing admixtures is analysed at first on cement pastes, as simple systems, and then verified on concrete.
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