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Verification of the composition of the concrete durability of cement-concrete covers
Černá, Eva ; Ťažký, Tomáš (referee) ; Hela, Rudolf (advisor)
Alcali – silica reaction often causes destruction of a concrete.constructions. In the theoretical part is described creation and causes of the ASR including assessment of individual components of concrete and their testing. The practical part is devoted to the results of some control tests of the concrete cover in the section 18 of the highway D1 (Měřín - Velké Meziříčí) and section D1-20 (Velké Meziříčí - Lhotka), the mechanical properties of the upper and the lower layer of the concrete cover and measuring the resistance of concrete against chemical deicing agents.
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The study of alkali-silica reaction in the cement-concrete shelters
Láznička, Josef ; Urbanec, Květoslav (referee) ; Hela, Rudolf (advisor)
Alkali – silica reaction is concrete durability problem resulting in significant maintenance and reconstruction costs to concrete infrastructures. This paper intends to summarize the current state of understanding this reaction with respect to reaction mechanisms. The experimental part of this paper deals with deterioration observed in cement – concrete cover for sections of highways in the Czech Republic. The objective was to determine wheter concrete failure arose due alkali – silica reaction or other mechanism.
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Possibilities of using waste foundry sand
Kopecký, Filip ; Koplík, Jan (referee) ; Opravil, Tomáš (advisor)
Considering increasing manufacture of metallic materials made in foundries increases also production of waste foundry sands. Foundry sands that remain after moulding and can not be reused in the prouction process anymore are usually not recycled nowadays and in the better cases they are clasified as a fill materials. These secondary raw materials are produced in relatively big amounts. Thats why is apropriate to search for their effective reuse. One of the possibilities is using of this materials in buliding industry. Thanks to their constitution and properties we can consider the possibilties of an alkaline activation, additional source to alkalit activated systems or like part of refractories.
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Verification of the composition of the concrete durability of cement-concrete covers
Černá, Eva ; Ťažký, Tomáš (referee) ; Hela, Rudolf (advisor)
Alcali – silica reaction often causes destruction of a concrete.constructions. In the theoretical part is described creation and causes of the ASR including assessment of individual components of concrete and their testing. The practical part is devoted to the results of some control tests of the concrete cover in the section 18 of the highway D1 (Měřín - Velké Meziříčí) and section D1-20 (Velké Meziříčí - Lhotka), the mechanical properties of the upper and the lower layer of the concrete cover and measuring the resistance of concrete against chemical deicing agents.
|
|
|
The study of alkali-silica reaction in the cement-concrete shelters
Láznička, Josef ; Urbanec, Květoslav (referee) ; Hela, Rudolf (advisor)
Alkali – silica reaction is concrete durability problem resulting in significant maintenance and reconstruction costs to concrete infrastructures. This paper intends to summarize the current state of understanding this reaction with respect to reaction mechanisms. The experimental part of this paper deals with deterioration observed in cement – concrete cover for sections of highways in the Czech Republic. The objective was to determine wheter concrete failure arose due alkali – silica reaction or other mechanism.
|
|
|
Possibilities of using waste foundry sand
Kopecký, Filip ; Koplík, Jan (referee) ; Opravil, Tomáš (advisor)
Considering increasing manufacture of metallic materials made in foundries increases also production of waste foundry sands. Foundry sands that remain after moulding and can not be reused in the prouction process anymore are usually not recycled nowadays and in the better cases they are clasified as a fill materials. These secondary raw materials are produced in relatively big amounts. Thats why is apropriate to search for their effective reuse. One of the possibilities is using of this materials in buliding industry. Thanks to their constitution and properties we can consider the possibilties of an alkaline activation, additional source to alkalit activated systems or like part of refractories.
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