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New procedures for evaluating concrete in existing construction
Juřenová, Jana ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
This bachelor thesis seeks to increase the awareness of the possibility of using the ultrasonic pulse method for the diagnosis of building structures. It emphasises the use of non-destructive methods, highlighting their ability to provide comparable results to traditional destructive methods of assessment, whilst minimising interference to the structure. The work includes reporting on the procedures for determining the characteristic compressive strength of concrete in existing structures as defined in EN 13791, updated in 2021. The work focuses primarily on calibrating results from non-destructive indirect measurements with those obtained destructively using core borings.
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Preparation and implementation of construction and technical survey of prestressed bridge structure
Kummer, Jan ; Kocáb, Dalibor (referee) ; Anton, Ondřej (advisor)
The thesis focuses on a visual excursion with photo documentation, the localisation of prestressing reinforcement of prefabricated beams type DS-T and the analysis of their state as well as the offtake of core drilling in order to establish their strength under pressure. In the theoretical part I describe the principles of the static effect of prestressed concrete and the basic sorting of technical survey and diagnostic methods. Furthermore I explain specific diagnostic methods for the determination of the location and state of prestressing reinforcement. The practical part focuses on photodocumentation of a bridge, the determination of the location of the beams reinforcement using georadar, (chopped probes to reinforcement and removal of core drilling samples. The conclusion provides the location of prestressing reinforcement and the level of its corrosion and grouting, the photo documentation of the bridge and a collection of samples from core drilling in order to determine the strength under pressure of the concrete.
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Building survey and evaluating the state construction
Nguyen, Martin ; Komárková, Tereza (referee) ; Heřmánková, Věra (advisor)
This diploma thesis deal with the building survey and evaluating the state of existing constructions. In theoretical part are described the types of civil engineering surveys and diagnostic methods for conducting a survey of reinforced concrete structures. The practical part deal with describes the structural and technical survey of the production hall in the industrial area Fatra Napajedla, evaluating the strength of concrete on the existing structure through donations cores and verification of compliance with the reinforcement according to project documentation. The last part is focused on a static assessment of selected supporting elements of the structure.
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Influence of Air Entrainment and Curing on Development of Elastic Modulus of Concrete
Bartulíková, Radka ; Kucharczyková, Barbara (referee) ; Kocáb, Dalibor (advisor)
Master's thesis deals with influence of various factors on the concrete compressive strength and modulus of elasticity. This work concentrates mainly on the influence of early curing and air entrainment of concrete. One part of this work is the evaluation of laboratory measurement, which was carried out on cubes of standard and norm prisms. The development of elastic moduli was monitored in time to 730 days of age with respect to air entrainment and curing conditions. The second part of the experiment deals with a comparison of theoretical creep curves depending on the value of the modulus of elasticity based on different standards. Again, the air entrainment effect and influence of initial conditions are reflected.
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The issue of determination of the static modulus of elasticity of concrete in structures
Halamová, Romana ; Misák, Petr (referee) ; Kocáb, Dalibor (advisor)
The thesis deals with the measurement of the elastic modulus of concrete in existing structures and possibilities of applicability of equations for the calculation of characteristic values of concrete compressive strength on the modulus of elasticity. The modulus of elasticity is determined by dynamic and static methods on specimens taken from the concrete blocks, whose composition varies by a water cement ratio and varying amounts of admixtures. In conclusion, the results of the measurements are compared and the characteristic values of the modulus of elasticity is determined.
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Building survey and evaluating the state of construction
Balash, Alan ; Anton, Ondřej (referee) ; Heřmánková, Věra (advisor)
This diploma thesis is focused on building survey and evaluating of the state of the three-storey industrial hall. The diploma thesis consists of two parts - theoretical and practical. In the theoretical part is described a common procedure for evaluation of the state of existing structures, methods used in diagnostics (selected ones - more detailed), advantages and disadvantages of methods. In the practical part is carried out construction and technical survey of the industrial hall, the concrete strength evaluation and verification of presence and type of reinforcement. At the end of the work - evaluation of objects.
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The Use of Non-Destructive and Destructive Testing Methods for the Determination of the Compressive Strength of Concrete
Fučík, Petr ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
This thesis deals with the summary of hardness test methods, their principles and types of devices used for nondestructive measurement of hardness test, including the latest devices and their description. It describes the basic relationship between hardness and compressive strength as well as procedures for obtaining the compressive strength of concrete in the structure. It provides an overview of testing methods by two normative approaches of processing and evaluation. The experimental part deals with the measurement on concrete parts using devices OriginalSchmidt type N, SilverSchmidt type N and SilverSchmidt type L, testing concrete compressive strength on cores and development of regression curve of these values.
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The Issue of testing shotcrete
Škapová, Pavla ; Hela,, Vlastimil (referee) ; Hubáček, Adam (advisor)
The master‘s thesis focuses on testing the shotcrete prepared in laboratory conditions. The main observed properties are compresive strenght of shotcrete and modulus of elasticity. The aim is assessment of methods for measuring those parameters. The calibrating correlations for strenght characteristics of shotcrete are given by obtaining the results of used methods. The shotcrete composition, amount and type of accelerating additive as well as economic aspect of using shotcrete is also assessed.
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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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Survey and Evaluation of Reinforced Concrete Structure
Ježíková, Pavlína ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
This diploma thesis focuses on the construction survey of the building where the University Cinema Scala and the Bolek Polívka theatre is located. The building will celebrate its 100th birthday in 2028 and its author is the builder Jaroslav Josef Polívka. The survey concerns reinforced frame constructions. The compressive strength of concrete cores and type of reinforcement was determined and non-destructive and destructive diagnostic tests were used. The first aim of the survey was to collect materials for a static report due to the planned superstructure but a visual inspection of the construction was performed and serious failures were found. For these reasons, the closure of the building was necessary. Last part of the thesis is the design of the reinforcement, if the same structure was designed according to the currently valid Eurocodes, but with the use of original materials; as well as a comparison of the designed reinforcement with the actual reinforcement.
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