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Study of the effect of selected types of aditives on the properties of cement composites
Kavka, Lukáš ; Ťažký, Tomáš (referee) ; Bodnárová, Lenka (advisor)
The diploma thesis describes admixtures for concrete. It deals with the influence of admixtures on the properties of cement composites in the fresh and hardened state. The theoretical part described the individual components of concrete, where the main attention was focused to inert admixtures and their effect on mechanical properties, shrinkage, resistance of cement composites to aggressive medium. Furthermore, the effect of admixtures on concretes with recycled aggregates was described. In the first stage of the practical part, cement mortars with 25, 35 and 50% replacement of cement admixtures were created. In the second stage, concretes with admixtures and a minimum strength class of C30/37 and C50/60 were created. Finely ground granulated slag, micronized limestone and granite stone dust were used as admixtures in mortars and concretes. The change of properties in the fresh and hardened state was observed on cement composites.
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Technical condition of sewer pipes
Došek, Jan ; Raclavský, Jaroslav (referee) ; Hluštík, Petr (advisor)
The aim of this bachelor thesis is to define damages of sewer pipes from the constructional point of view and by selected damages set the limits according to valid standards in the Czech Republic. The beginning of this work is an introduction to the legislative and setting of the basic concepts. Another point of this part is to characterize particular materials and damages by which are they effected. It is the questions of ovalisation, longitudinal bending, positional deviation, mechanical wear, corrosion, crack, pipe break and collapse. The main point of this work are calculation part, where the limits for selected damages of particular materials are set one by one. The result are the summary tables that shows the limits and allow the comparison of these analysed sewer pipe materials.
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Study of the effect of selected types of aditives on the properties of cement composites
Kavka, Lukáš ; Ťažký, Tomáš (referee) ; Bodnárová, Lenka (advisor)
The diploma thesis describes admixtures for concrete. It deals with the influence of admixtures on the properties of cement composites in the fresh and hardened state. The theoretical part described the individual components of concrete, where the main attention was focused to inert admixtures and their effect on mechanical properties, shrinkage, resistance of cement composites to aggressive medium. Furthermore, the effect of admixtures on concretes with recycled aggregates was described. In the first stage of the practical part, cement mortars with 25, 35 and 50% replacement of cement admixtures were created. In the second stage, concretes with admixtures and a minimum strength class of C30/37 and C50/60 were created. Finely ground granulated slag, micronized limestone and granite stone dust were used as admixtures in mortars and concretes. The change of properties in the fresh and hardened state was observed on cement composites.
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Technical condition of sewer pipes
Došek, Jan ; Raclavský, Jaroslav (referee) ; Hluštík, Petr (advisor)
The aim of this bachelor thesis is to define damages of sewer pipes from the constructional point of view and by selected damages set the limits according to valid standards in the Czech Republic. The beginning of this work is an introduction to the legislative and setting of the basic concepts. Another point of this part is to characterize particular materials and damages by which are they effected. It is the questions of ovalisation, longitudinal bending, positional deviation, mechanical wear, corrosion, crack, pipe break and collapse. The main point of this work are calculation part, where the limits for selected damages of particular materials are set one by one. The result are the summary tables that shows the limits and allow the comparison of these analysed sewer pipe materials.
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