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Comparison of calibration relationships for determining the compressive strength of various types concrete of non-destructive testing
Kaplan, Václav ; Voves, Jiří (referee) ; Brožovský, Jiří (advisor)
The bachelor thesis deals with the copmarison of calibration relationships for compressive strength of concrete by non-destructive testing. The work describes the methods for the determination of compressive strength of concrete obtained by non-destructive methods, including rebound hammer method, ultrasonic pulse method and combined SonReb method for various types of concrete. In thesis are described species tested concretes obtained normalweigt concrete, high-performance and high-strenght concrete, light-weight concrete and self-compacted concrete. In this work are described below used types of non-destructive testing, terms of use and czech technical standarts related with non-destructive testing. For the comparisons are utilized calibration relationships of technical standarts manufacturers of test equipment and specialised literature.
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Detection of Failures and cavities in structures using radar
Tkadleček, Petr ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
The bachelor‘s thesis describes non-destructive testing and methods, which are used in civil engineering. It is focused on the detection of failures and cavities in concrete structures. In the first part the methods are described and compared. The second part describes experimental measurements on concrete structures, which contain failures. The results are described and interpreted. The used methods are compared. It was evaluated, which of these methods is suitable for the detection of failures and cavities in structures.
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Possibilities of using GPR to detect reinforcement of concrete structures
Filipu, Martina ; Heřmánková, Věra (referee) ; Anton, Ondřej (advisor)
The aim of this study is to outline how is GPR used to detect reinforcement in concrete structures. In each part the study deals with diagnostic testing methods used for building construction and shows a recognisability of steel reinforcement in concrete. Then it closely examines applications of GPR in a diagnostics of reinforced concrete structures with using Hilti PS 1000 device. In the practical part I conducted a building survey of wall silo using GPR and electromagnetic indicators. The aim was to identify the position of reinforcement which was subsequently compared with the project documentation. The construction survey was carried out as a reason of several serious defects such as cracks and tilting of major part of one of the silo walls.
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Hardness testing of concrete in construction - new devices and procedures
Mikulec, Jan ; Pospíchal, Ondřej (referee) ; Cikrle, Petr (advisor)
In this bachelor thesis is carried out a research of non-destructive hardness methods. There are presented different instruments for measuring hardness and their destination for materials. There are also described and compared two possible approaches to processing of measured values and their evaluation. It deals with news in detail of hardness testers and work with them. These knowledge are applied to measure the hardness of concrete components using an instrument OriginalSchmidt type N and SilverSchmidt PC type N and data processing according to the two approaches and their comparison with the reasults of the cores.
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Shortest Ways Finding in Discrete Bodies
Chlada, Milan ; Převorovský, Zdeněk
Estimation of the shortest wave-path is a crucial task not only in the field of acoustic emission (AE) source location. Recently designed method for solving the problem was inspired by Huygens' principle as easy to implement alternative suitable for discretized 2D or 3D 'bitmap' pictures of a body. This approach also enables tracing of elastic waves propagating in structures of complicated shapes without mathematical models and collecting sufficient amount of representative data for AE source location algorithms based on database searching or artificial neural networks. The new method already showed its advantages and potentialities in practical tasks as discussed.
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Analysis of wood behaviour in the surroundings of a pin being pushed for the diagnostics of constructional elements of buildings
Kloiber, Michal ; Tippner, J. ; Hrivnák, J. ; Vichrová, Gábina ; Valach, Jaroslav
The technical solution of this diagnostic device for in-situ and laboratory measuring of conventional strength and the module of deformation by opening clamps in a drilled hole belongs to the field of quality and material property testing, especially concerning timber. In dependence on the specific technical solution, the device can be used for an establishment of conventional strength and the module of deformation of any material by opening clamps in a drilled hole in the examined volume. It also finds application in the situations when resistance drilling cannot be used and the mechanical properties of timber need to be established through the entire section of the examined element. Its main advantages are its speed and simple operation without a need for power distribution network.
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Ultrasonic testing of the structural timber within historic buildings - preview of elaborated methodics
Kloiber, Michal ; Bláha, Jiří ; Kotlínová, M.
The authors are engaged in interdisciplinary research and non-destructive testing of historic timber structures both in situ and in the lab. Therefore they take advantage of combining the approaches inherent to technical, historical and craft analyses of timberwork. To facilitate the spreading of knowledge of up-to-date diagnostic methods they are preparing an overview guidebook now which is supposed to help the heritage workers, owners, designers or contractors to choose among the possible testing tools and techniques the most proper one. The chapter which is devoted to the applying of ultrasonic methods for the timber non-destructive testing is shown as a sample here.
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