Browsing Ústav fyziky by Author "Kocáb, Dalibor"
Now showing items 1-10 of 10
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The Acoustic Emission Parameters Obtained during Three-point Bending Test on Thermal-stressed Concrete Specimens
Topolář, Libor; Kucharczyková, Barbara; Kocáb, Dalibor; Pazdera, Luboš (Elsevier, 2017-06-02)Fire response of concrete structural members depends on thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature and also depend on the composition and characteristics ... -
Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests
Kucharczyková, Barbara; Šimonová, Hana; Kocáb, Dalibor; Topolář, Libor (MDPI, 2021-10-25)This paper presents the results of an experimental program aimed at the assessment of the freeze–thaw (F–T) resistance of concrete based on the evaluation of fracture tests accompanied by acoustic emission measurements. ... -
Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete
Topolář, Libor; Kocáb, Dalibor; Pazdera, Luboš; Vymazal, Tomáš (MDPI, 2021-03-05)This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete ... -
Comprehensive Testing Techniques for the Measurement of Shrinkage and Structural Changes of Fine-Grained Cement-Based Composites during Ageing
Kucharczyková, Barbara; Topolář, Libor; Daněk, Petr; Kocáb, Dalibor; Misák, Petr (Hindawi Publishing Corporation, 2017-01-15)The paper deals with an experimental analysis focusing on the utilization of a specific measurement technique for determining the development of shrinkage and for monitoring structural changes in fine-grained cement-based ... -
The Effect of Specimen Size on Acoustic Emission Parameters and Approximate Position of Defects Obtained during Destructive Testing of Cementitious and Alkali-Activated Degraded Fine-Grained Materials
Topolář, Libor; Kocáb, Dalibor; Hrubý, Petr; Jakubka, Luboš; Hoduláková, Michaela; Halamová, Romana (MDPI, 2023-05-04)Two sizes of test samples were selected to investigate the effect of size on the level of degradation. The smaller test specimens had dimensions of 40 × 40 × 160 mm, and the larger ones had dimensions of 100 × 100 × 400 ... -
Experimental Analysis of the Development of Elastic Properties and Strength under Different Ambient Temperature During the Hardening of Concrete
Kocáb, Dalibor; Daněk, Petr; Misák, Petr; Topolář, Libor; Pőssl, Petr (Elsevier, 2017-07-20)This paper focuses on the experimental assessment of the degree to which continued exposure to low ambient temperatures influences the concrete modulus of elasticity and compressive strength. The elastic modulus is not a ... -
Experimental assessment of the influence of multiple cyclic loading on the dynamic modulus of elasticity of concrete
Misák, Petr; Kocáb, Dalibor; Daněk, Petr; Kucharczyková, Barbara; Topolář, Libor (EDP Sciences – Web of Conferences, 2017-05-24)The goal of the experiment was to determine the influence that cyclic loading has on concrete dynamic modulus of elasticity and compressive strength. Each test specimen was subjected to cyclic loading with the loading force ... -
The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement
Hoduláková, Michaela; Kocáb, Dalibor; Topolář, Libor; Kucharczyková, Barbara (MATEC Web of Conferences, 2018-10-29)The paper reports the analysis of acoustic emission signals captured during compressive strength tests of fine-grained cement-based composites of various composition. Acoustic emission monitoring belongs to a non-invasive ... -
Testing the Influence of the Material Bonding System on the Bond Strength of Large-Format Tiles Installed on Concrete Substrate under Mechanical Loading
Topolář, Libor; Kocáb, Dalibor; Šlanhof, Jiří; Schmid, Pavel; Daněk, Petr; Nováček, Jaroslav (MDPI, 2020-07-17)The paper describes an experiment focusing on the way the material system influences the bond strength of large-format tiles installed on concrete substrate during mechanical loading under conditions that correspond to ... -
The use of the acoustic emission method for the monitoring of changes in the internal structure of polymer-cement mortars when testing the static compressive modulus of elasticity
Kocáb, Dalibor; Topolář, Libor; Kucharczyková, Barbara; Hoduláková, Michaela; Daněk, Petr (EDP Sciences – Web of Conferences, 2017-05-24)The paper focuses on the experimental determination of the dynamic and static compressive modulus of elasticity of selected polymer-cement mortars and their comparison. The dynamic modulus of elasticity was determined by ...