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The verification of the time development of the concrete elastic modulus and the compressive strength
Alexa, Martin ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
Especially in the early days of curing concrete for structures sensitive on deformation. Same like bridges of prestressed concrete a substantial knowledge of the exact value of the modulus of elasticity that could prevent excessive deformation. In this work we validates the development of concrete modulus of elasticity (in the first 28 days), which is used for the construction of bridges on the highway D1 near Ružomberok. To understand this issue was made a literature review and conducted experiment, which follows the time development of the concrete compressive strength and modulus of elasticity of concrete. Except the determination of modulus of elasticity in the experiment was investigated a dynamic moduli by an ultrasonic pulse method and the resonance method and the experiment was also performed by rebound hammer. The results can serve to verify the development of the modulus of elasticity on the actual structure.
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The use of ultrasonic testing in construction
Sztulová, Petra ; Komárková, Tereza (referee) ; Láník, Jaromír (advisor)
The thesis is divided into two parts. The first part is focused on the use of ultrasonic methods in building practice. Explains here how ultrasound works. The second part focuses on the possibility of anchoring. It describes what is chemical, mechanical anchoring. It deals with the tensile testing additionally mounted chemical anchors Hilti. Primarily focuses on what happens if it fails to comply with the correct technological procedure when installing chemical anchors.
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Modulus of elasticity of natural stone
Hoduláková, Michaela ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
The value of the modulus of elasticity of concrete depends on the concrete composition (particularly on the aggregate used). The contemporary construction industry literature lacks comprehensive studies of the modulus of elasticity for each type of the rock stone. Therefore, this study focuses on testing and comparing the modulus of elasticity of selected types of rock stones used for the production of crushed coarse aggregates into the concrete. The modulus of elasticity are determined by static and dynamic methods. The work also deals with the modulus of elasticity of granite in different stages of weathering.
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