Tracing of Concrete Hydration by Means of Impedance Spectroscopy (New Tool for Building Elements Testing)

Kusák, Ivo; Lunak, Miroslav; Schauer, Pavel

doi:10.4028/www.scientific.net/amm.248.370

Cited by 35 publications

(27 citation statements)

References 9 publications

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“…Using IS_alpha program [8,9] mainly, the frequency dependence of the loss factor, the real impedance components and the imaginary impedance components of the sample were obtained. The loss factor is a material characteristic, while the other two dependencies are only related to the sample type.…”

Section: Materials Ad Methodsmentioning

confidence: 99%

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Impedance spectroscopy – comparison of dielectric model with experimental results

Kusak,

Lunak,

Mizerova

et al. 2023

J. Phys.: Conf. Ser.

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Impedance measurements of building materials have been gaining popularity especially in the last twenty years. No electrical component has only resistance, capacitance or inductance, as there is an interplay of these parameters. This is compounded in the case of building materials, which contain a significant number of different phases that vary in chemical composition, crystalline structure and properties. It is, therefore, necessary to choose a connection and measurement system that provides the most accurate information about the building material. This information is primarily meant to include the complex impedance, its components and the quantities derived from them. The derived quantities are electrical resistance or electrical capacitance. Using these quantities we can point out the composition of the material, its conductivity and identify the percolation threshold or describe its sensory properties in more detail. For measurements, an alternating electric field is crucial, and the range of frequencies depends on the instruments used. For materials characterization, the most used frequency range is 100 Hz to 100 kHz; however, we can measure down to 1 MHz.

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Section: Materials Ad Methodsmentioning

confidence: 99%

“…For homogeneous materials, the theory of dielectric polarization was built by Debye [6][7][8][9][10]. However, experiments and conclusions on real substances showed differences from the basic theories.…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy – comparison of dielectric model with experimental results

Kusak,

Lunak,

Mizerova

et al. 2023

J. Phys.: Conf. Ser.

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“…Employing the apparatus for measurement by impedance spectroscopy methodology (IS) and using a block diagram [1][2][3][4][5], the RC circuit was automatically characterized using the IS alfa application which was programmed for these purposes [6][7].…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy – comparison of dielectric models with a real RC circuit

Kusák

Lunak

Mizerová

et al. 2022

J. Phys.: Conf. Ser.

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When studying heterogeneous systems, it is necessary to know properties of all present phases and also structure and behaviour of their mutual interfaces. A discrete model respects atomic structure of bodies (atomic in the sense of particles as carriers of homogeneous properties). It replaces individual atoms with mass points called particles whilst each one of them is a carrier of properties (attributes). The goal of the mathematical formulation of a discrete model is assigning values to particles’ properties. These are displays from a set of particles into a set of attribute values. In general, each one of these displays is a time function. In the paper, we compare a parallel RC circuit with a model outcome. Real electrotechnical components were used: a resistor and a capacitor, which are commonly available in electrical component shops. The accuracy of the value of electrical capacity is below 20 %, the accuracy of the value of electrical resistance is below 5%. The guide value was determined using the Tesla BM595 bridge RLCG meter. R = 9.58 MΩ, C = 10.25 pF – measured at frequency of 1000 Hz. An electrically conductive parallel connection of the resistor and the capacitor was inserted between electrodes and a conductive contact was made.

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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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Tracing of Concrete Hydration by Means of Impedance Spectroscopy (New Tool for Building Elements Testing)

Cited by 35 publications

References 9 publications

Impedance spectroscopy – comparison of dielectric model with experimental results

Impedance spectroscopy – comparison of dielectric model with experimental results

Impedance spectroscopy – comparison of dielectric models with a real RC circuit

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

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