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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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Evaluation of stone column defects using an ultrasonic method
Kršková, Šárka ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
This Bachelor thesis deals with evaluation of structure defects in stone column using ultrasonic method. Content of this thesis is divided to theoretical and practical part. Aim of theoretical part is to explain process of evaluation of existing stone structures according to norm ČSN ISO 13822. This part also contains listings of method for stone testing and brief explanation of chosen types of rock used for stone structures. Practical part contains tests used on columns using ultrasonic method and laboratory tests of chosen samples. Evaluation of measuring using ultrasonic method is based on knowledge of this method and visual inspection of columns. In laboratory tests were compared results of chosen properties on examples of same type of rock. These examples had different shape, moisture and measurement.
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Diagnosis of the fire damaged bridge
Olejková, Sabina ; Láník, Jaromír (referee) ; Cikrle, Petr (advisor)
This thesis is about assessment of a bridge construction influenced by fire accident. The bridge is situated at the highway D46 beyond the town Držovice. Within this construction research, there will be mentioned diagnostic methods – A non- destructive method (Ultrasonic pulse method and hardness tests) and destructive methods (borehole and tear off tests). For find out in which way was the concrete of the bridge damaged and hurt while facing a high temperature of fire, there were taken samples, which were analyzed by physical and chemical test. We can analyze composition and microstructure of the concrete. The result of this tests will be evaluated, and the actions of a remediation will be suggested.
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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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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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Diagnosis of the fire damaged bridge
Olejková, Sabina ; Láník, Jaromír (referee) ; Cikrle, Petr (advisor)
This thesis is about assessment of a bridge construction influenced by fire accident. The bridge is situated at the highway D46 beyond the town Držovice. Within this construction research, there will be mentioned diagnostic methods – A non- destructive method (Ultrasonic pulse method and hardness tests) and destructive methods (borehole and tear off tests). For find out in which way was the concrete of the bridge damaged and hurt while facing a high temperature of fire, there were taken samples, which were analyzed by physical and chemical test. We can analyze composition and microstructure of the concrete. The result of this tests will be evaluated, and the actions of a remediation will be suggested.
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Evaluation of stone column defects using an ultrasonic method
Kršková, Šárka ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
This Bachelor thesis deals with evaluation of structure defects in stone column using ultrasonic method. Content of this thesis is divided to theoretical and practical part. Aim of theoretical part is to explain process of evaluation of existing stone structures according to norm ČSN ISO 13822. This part also contains listings of method for stone testing and brief explanation of chosen types of rock used for stone structures. Practical part contains tests used on columns using ultrasonic method and laboratory tests of chosen samples. Evaluation of measuring using ultrasonic method is based on knowledge of this method and visual inspection of columns. In laboratory tests were compared results of chosen properties on examples of same type of rock. These examples had different shape, moisture and measurement.
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