Comparison of Impedance Spectra of Concrete Recorded with Utilizing Carbon Transition Paste

Kusák, Ivo; Lunak, Miroslav

doi:10.4028/www.scientific.net/amr.897.131

Cited by 15 publications

(9 citation statements)

References 4 publications

(1 reference statement)

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“…Prepared test samples (Table 1) were characterized by impedance spectroscopy [6,7,8,9] using sinusoidal signal generator Agilent 33220A and dual-channel oscilloscope Agilent 54645A. These instruments were assembled under the proposed scheme for fully automated measurement.…”

Section: Methodsmentioning

confidence: 99%

Influence of Carbon Admixtures to the Electrical Conductivity of Slag Mortars

Kusák

Lunak

Míková

et al. 2016

SSP

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Applied research tries to offer new materials from the slag mortars. Basic research tries to explore these engineered materials from the perspective of all the possible test methods. Modern vector analyzer R&S ZNC with a coaxial probe DAK-12 from Speag company was used to determine permittivity and dielectric loss factor of the beams and interesting spectrums of electric resistance were measured for samples with varying content of carbon powder. Carbon contributes from the viewpoint of electrical properties, for example it improved antistatic properties of the floor. In addition to the vector analyzer – the simpler measuring unit was also used. In a frequency range of 40 Hz to 1 MHz values of electrical resistance and permittivity values of the beams with different content of graphite powder, labeled Cond 896 were determined. The higher content of graphite powder increases the electrical conductivity; building materials based on cement are becoming more measurable using electromagnetic measuring methods. The most striking change in the relative conductivity was observed at excitation frequency of the external electric field of 1 kHz. At high frequencies of electrical excitation field from 10 MHz to 3 GHz values of the real part of permittivity were determined by vector analyzer. These measurements are among the building materials used rarely and they open new possibilities of diagnostics.

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Section: Methodsmentioning

confidence: 99%

Influence of Carbon Admixtures to the Electrical Conductivity of Slag Mortars

Kusák

Lunak

Míková

et al. 2016

SSP

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“…Dielectric losses frequency dependence monitoring is significant detail of IS. We suppose, that dielectric losses can probably be more demonstrable with composite materials and plastics than in common use building materials [1,2].…”

Section: Introductionmentioning

confidence: 97%

Changes of Electrical Parameters of Cement Chipboards Cetris-Basic after Freezing Cycle

Kusák

Lunak

2015

AMR

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NDT impedance spectroscopy method was used to characterize a Cetris wood-cement chipboard. Dry specimen pre-stress and post-stress cycle tan δ (f) spectrum variances were observed. Effects of potential dielectric losses and the predominance of the polarization and conductivity components in various regions of the impedance spectrum of samples after frozen stress cycle are described. The method reproducibility has been verified by multiple measurements.

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“…The main reason is the necessity of determination of the durability and reliability of buildings and structures, as well as the assessment of their safe operation time. Most researchers [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ] agree that quantitative and qualitative evaluation of the residual bearing capacity of damaged material should include consideration of specifics of physical and chemical corrosion mechanisms. This problem was thoroughly discussed in a number of previous research works.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Electrical measurement methods of chemical processes in concrete were also conducted by Kusak et al [ 38 , 39 , 40 ], Cabeza [ 41 ] and Macdonald [ 42 ].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

et al. 2021

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A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where the environment could be contaminated with aggressive products or waste. An important issue is the development of methods for calculating the load-bearing capacity and serviceability of reinforced concrete structures with corrosion damage. The main reason for this is the necessity to determine the durability and reliability of buildings and structures and the estimation of their safe operation time. As corrosion damages of concrete are a critical issue, more detailed experimental studies are needed. This paper presents experimental studies of concrete prisms under the simultaneous action of an aggressive environment and a constant level of compressive force. In total, 32 prisms under different loading conditions and in different aggressive medium were tested. Samples were divided in series, for which different load levels were chosen (0.25fck, 0.35fck, 0.45fck). Additionally, control samples in the air and immersed in water were tested. During the experiment, different parameters were monitored and recorded: decrease of cross-sectional size, the temperature and environmental humidity. Results of the study showed that destruction occurred due to the presence of corrosion damages of concrete and a reduction of the cross-sectional area. The stresses in the concrete at the destruction stage were less than the value of the prism strength by 10–12%. It was established that along the contour of the section, there is a partially degraded layer of concrete of 1.5–3.7 mm thickness, with corrosion microcracks and corrosion products. Additionally, experimental and theoretical diagrams of concrete with corrosion damages were obtained and compared. The ultimate deformations of concrete with corrosion damage, which correspond to the prismatic strength of concrete, in comparison with undamaged concrete were lower by 11–18%. Therefore, the concrete strength is decreased during exploitation under loading in an aggressive environment, which needs to be taken into account during calculations.

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Comparison of Impedance Spectra of Concrete Recorded with Utilizing Carbon Transition Paste

Cited by 15 publications

References 4 publications

Influence of Carbon Admixtures to the Electrical Conductivity of Slag Mortars

Influence of Carbon Admixtures to the Electrical Conductivity of Slag Mortars

Changes of Electrical Parameters of Cement Chipboards Cetris-Basic after Freezing Cycle

Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

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