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Usability of basal fibres in cement composites
Kolková, Kristína ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with issues of using basalt fibers in cement composites and it consists of a theoretical research and an experimental part. In the theoretical research is a description of properties of basalt fibers, production technology and behavior of fresh and hard concrete with addition of basalt fibers. There is mentioned an example of application in practice of basalt fibers for a reconstruction of a bridge construction. The theoretical research also deals with more possibilities of use of products made from melted basalt. In the experimental part was verified behavior of fresh and hard concrete with the addition 3, 10 and 20 kg.m-3 of short basalt fibers. These mixtures were compared with the reference mixture from plain concrete. There was determined the consistency in fresh condition by the slump test, the density and the air content. The flexure strength, compressive strength and tensile strength were determined on hard concrete samples in age of 28 days. The presence of basalt fibers was detected by an electron scanning microscope.
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Possibilities of application of basalt fibers in concrete
Zourek, Milan ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis deals with possibilities of application of basalt fibers in concrete and in cementitious composites. In the theoretical part there is a summary of fibers usually used for fiberconcretes. Manufacturing process of basalt fibers is described, and properties of basalt fibers are summarized. Next part deals with properties of basalt fiber reinforced concrete. Concretely fresh properties, physical-mechanical properties, shrinkage and cracking, microstructure and fire resistance. The last chapter deals with fire resistance of concrete in general. The experimental part of this diploma thesis is divided into two phases. There were two mixes of basalt fiber reinforced concrete made with basalt aggregate and one mix of concrete without basalt fibers in the first phase. Density, consistency by slump and air content were determined as fresh properties. As hardened properties density, compressive strength and flexural strength were determined. There was determined the effect of the temperatures 600 and 800 °C on density, compressive strength and outward of specimens. Also, deformation during the high temperature curing was recorded. In the second phase of the experimental part there were three mixes of cementitious composite made with basalt fibers and one cementitious composite without basalt fibers. Density was determined as a fresh property. Material was monitored during its mixing. As a hardened properties density, flexural strength and compressive strength were determined. There was determined the effect of the temperatures 600 and 800 °C on density, flexural strength, compressive strength and outward of specimens.
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Study the abrasion resistance of concrete
Kolková, Kristína ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The thesis deals with the issues of concrete abrasion resistance and it consists of a theoretical research part and an experimental part. The types of abrasion affecting concrete construction and abrasion effect of flowing water-borne sand are described in the theoretical research part. A substantial part is dedicated to the impact of concrete properties and to each material of the concrete mixture on the abrasion resistance. The impact of addition of various types of fibers is inquired. The mixtures with the addition of 2 kg.m-3 and 4 kg.m-3 of basalt fibers and the addition of 1 kg.m-3 and 2 kg.m-3 of polypropylene fibers are designed in the experimental part. The mixtures are compared to a reference mixture without fibers. Density and consistency of fresh concrete settling at 5 minutes are determined in fresh condition. Density, compressive strength, tensile strength, watertight, concrete absorption and bending tensile strength are determined on hard concrete. The impact of the addition of fibers to the concrete abrasion resistance is inquired using the Bohm abrasion method and wheel abrasion method. A water jet is used as another method for testing abrasion resistance and for comparing the suitability of the used methods.
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Usability of basal fibres in cement composites
Kolková, Kristína ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with issues of using basalt fibers in cement composites and it consists of a theoretical research and an experimental part. In the theoretical research is a description of properties of basalt fibers, production technology and behavior of fresh and hard concrete with addition of basalt fibers. There is mentioned an example of application in practice of basalt fibers for a reconstruction of a bridge construction. The theoretical research also deals with more possibilities of use of products made from melted basalt. In the experimental part was verified behavior of fresh and hard concrete with the addition 3, 10 and 20 kg.m-3 of short basalt fibers. These mixtures were compared with the reference mixture from plain concrete. There was determined the consistency in fresh condition by the slump test, the density and the air content. The flexure strength, compressive strength and tensile strength were determined on hard concrete samples in age of 28 days. The presence of basalt fibers was detected by an electron scanning microscope.
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Possibilities of application of basalt fibers in concrete
Zourek, Milan ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis deals with possibilities of application of basalt fibers in concrete and in cementitious composites. In the theoretical part there is a summary of fibers usually used for fiberconcretes. Manufacturing process of basalt fibers is described, and properties of basalt fibers are summarized. Next part deals with properties of basalt fiber reinforced concrete. Concretely fresh properties, physical-mechanical properties, shrinkage and cracking, microstructure and fire resistance. The last chapter deals with fire resistance of concrete in general. The experimental part of this diploma thesis is divided into two phases. There were two mixes of basalt fiber reinforced concrete made with basalt aggregate and one mix of concrete without basalt fibers in the first phase. Density, consistency by slump and air content were determined as fresh properties. As hardened properties density, compressive strength and flexural strength were determined. There was determined the effect of the temperatures 600 and 800 °C on density, compressive strength and outward of specimens. Also, deformation during the high temperature curing was recorded. In the second phase of the experimental part there were three mixes of cementitious composite made with basalt fibers and one cementitious composite without basalt fibers. Density was determined as a fresh property. Material was monitored during its mixing. As a hardened properties density, flexural strength and compressive strength were determined. There was determined the effect of the temperatures 600 and 800 °C on density, flexural strength, compressive strength and outward of specimens.
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