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Determination of the formwork strength of concrete using a Silver Schmidt hardness tester
Janka, Marek ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
This bachelor thesis deal with the issues of nondestructive testing of the formwork removal strength of concrete. It works with two different compositions of concrete and for both of them, it determines the relation between compressive strength and surface hardness obtained by the SilverSchimdt hammer with mushroom plunger. It shows inappropriateness of ultrasonic impulse method to determine formwork removal strength. It compares obtained relations with each other and with the literature. The goal of this thesis is to utilize determined relations for verification of minimal requested formwork removal strength during construction.
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Non-destructive properties detection of concrete of prestressed beams
Mikulec, Jan ; Bílek, Vlastimil (referee) ; Cikrle, Petr (advisor)
The masers’s thesis is about the methods of non-destructive testing and about determining the properties of prestressed concrete. The first part pursues an introduction on the prestressed concrete, its essence and material properties. The next section describes the non-destructive diagnostic methods used in the practical part – the ultrasound impulse method, the resonance method and the rebound hardness test method. There are described destructive tests on the specimens for the calculation of the calibration. This is followed by a practical part, which describes the item tested - truss, its manufacturing, storage, and perform the test. Then search value are calculated from the test results and results are compared according to various procedures specified in the standards. The last section is devoted to the calculation of camber truss and loss of preload.
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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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Determination of the formwork strength of concrete using a Silver Schmidt hardness tester
Janka, Marek ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
This bachelor thesis deal with the issues of nondestructive testing of the formwork removal strength of concrete. It works with two different compositions of concrete and for both of them, it determines the relation between compressive strength and surface hardness obtained by the SilverSchimdt hammer with mushroom plunger. It shows inappropriateness of ultrasonic impulse method to determine formwork removal strength. It compares obtained relations with each other and with the literature. The goal of this thesis is to utilize determined relations for verification of minimal requested formwork removal strength during construction.
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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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Non-destructive properties detection of concrete of prestressed beams
Mikulec, Jan ; Bílek, Vlastimil (referee) ; Cikrle, Petr (advisor)
The masers’s thesis is about the methods of non-destructive testing and about determining the properties of prestressed concrete. The first part pursues an introduction on the prestressed concrete, its essence and material properties. The next section describes the non-destructive diagnostic methods used in the practical part – the ultrasound impulse method, the resonance method and the rebound hardness test method. There are described destructive tests on the specimens for the calculation of the calibration. This is followed by a practical part, which describes the item tested - truss, its manufacturing, storage, and perform the test. Then search value are calculated from the test results and results are compared according to various procedures specified in the standards. The last section is devoted to the calculation of camber truss and loss of preload.
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