Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

Cleven, Simon; Raupach, Michael; Matschei, Thomas

doi:10.3390/ma14123408

Cited by 18 publications

(21 citation statements)

References 60 publications

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“…A technique that is already used for structural concrete monitoring to identify and locate steel rebars is the electric resistivity measurement (see, e.g., [27][28][29][30][31][32]. Based on an easyto-use test setup, which was already tested in past studies conducted by the authors [33], a new application test based on the analysis of cylindrical specimens is proposed in this research paper. In the first part of the study, the test setup is adjusted and a numerical model is generated to simulate the flow of the alternating current, which enables the comparison and calculation of the resistivity of the different specimen directions that are possible.…”

Section: Introductionmentioning

confidence: 99%

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

2022

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The diagnostics of constructions built with steel fibre reinforced concrete are extremely difficult to conduct because, typically, no information on the actual amount and orientation of the fibres is available. Therefore, it is of great interest to engineers to have the possibility to determine the steel fibre content and, at best, also the orientation of the fibres in existing structures. For this purpose, an easy-to-use test setup was developed and tested, in the course of laboratory investigations. This method can be used for cylinders, for example drilling cores, that can later be taken of existing structures, to determine both the fibre content and orientation. Based on these results, a model for cylindrical specimens was derived, which can be used for varying concrete compositions with steel fibre contents of up to 80 kg/m3. In the case of missing information concerning the concrete composition, it allows an initial estimation for the fibre content. In case additional information about the concrete composition is available, a much higher accuracy of the projected steel fibre content and therefore, an assessment of the building’s condition is possible.

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Section: Introductionmentioning

confidence: 99%

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

2022

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“…However, it is well known that steel fibers improve the electrical conductivity of concrete. When steel fibers were incorporated into concrete, the steel fibers were entangled to form an effective conductive path [13,51]. When 0.75% of the steel fibers were added to the NC-SS15 and LC-SS15 specimens, the decrease in electrical resistivity was significantly reduced.…”

Section: Flexural Strengthmentioning

confidence: 99%

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

et al. 2021

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There is increased interest in applying electromagnetic (EM) shielding to prevent EM interference, which destroys electronic circuits. The EM shielding’s performance is closely related to the electrical conductivity and can be improved by incorporating conductive materials. The weight of a structure can be reduced by incorporating lightweight aggregates and replacing the steel rebars with CFRP rebars. In this study, the effects of lightweight coarse aggregate and CFRP rebars on the mechanical and electrical characteristics of concrete were investigated, considering the steel fibers’ incorporation. The lightweight coarse aggregates decreased the density and strength of concrete and increased the electrical conductivity of the concrete, owing to its metallic contents. The steel fibers further increased the electrical conductivity of the lightweight aggregate concrete. These components improved the EM shielding performance, and the steel fibers showed the best performance by increasing shielding effectiveness by at least 23 dB. The CFRP rebars behaved similarly to steel rebars because of their carbon fiber content. When no steel fiber was mixed, the shielding effectiveness increased by approximately 2.8 times with reduced spacing of CFRP rebars. This study demonstrates that lightweight aggregate concrete reinforced with steel fibers exhibits superior mechanical and electrical characteristics for concrete and construction industries.

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“…The durability of cement composite is determined not only by its physical and mechanical properties, but also by its electrical characteristics, and can ensure the operational reliability of materials. Studies aiming to stabilize the dielectric properties and the resistance to sulphate attack of electrically insulating concrete have been successfully performed in recent decades [1][2][3]. However, the corrosion resistance to sulphate attack of electrically conducting composites has not been sufficiently studied.…”

Section: Introductionmentioning

confidence: 99%

“…Studies of the mechanism of electrical conductivity of the solid phase of composite based on Portland cement show that the hydrated concrete is a combination of hydration products with non-hydrated clinker minerals [1,23], with thermodynamically unstable compounds having imperfectly ordered crystal structures. It is shown [31] that the total calculated change of the entropy in the reactions of the formation of calcium silicates, aluminates, and aluminoferrites is significantly less than the entropy of the clinker materials themselves.…”

Section: Introductionmentioning

confidence: 99%

“…In turn, these data confirm that the solid phase of concrete is not a regular crystal lattice with the presence of vacancies in the nodes and a variety of ions in the internodes. The bonds of these ions are significantly weaker than those in regular crystals, which affects all the physical and chemical properties of cement-based composites, including their electrical conductivity [1]. As a result, the combined action of thermal motion and the electric field can lead to the creation of certain conditions under which a particular ion can become a current carrier.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Sulphate Attack on Properties of Modified Cement Composites

et al. 2021

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Monitoring the condition of building structures based on composite materials in aggressive environments shows that the deterioration of basic properties occurs under the influence of various factors such as temperature and humidity changes,in addition to changes in the chemical composition of air environment. In addition, the composite materials during the operation must retain not only the mechanical properties laid down at the design stage, but also the electro-physical characteristics, regardless of the type of destructive effects. In the current study, the quantitative assessment of the result of the interaction of an aggressive sulphate-containing medium with composites modified with conductive and dielectric additives was carried out. The effect of sulphateattack on the specific electrical conductivity of cement composites was studied. The nature of the interaction was evaluated by changing the properties of the samples of the developed compositions under the influence of a single-normal solution of sodium sulphate. The analysis was carried out by means of potentiometric titration using the exchange interaction method by fixing the degree of absorption of sulphate ions and determining the concentration of calcium ions in the solution. The measurement of the solution potential allowed determination of the quantitative indicators of the rate of calcium hydroxide leaching from the sample structure,which is necessary to assess the intensity of the destruction process and determine the nature of the change in strength properties.Measurements of the electrical resistivity of samples under the constant influence of sulphate aggression were taken during 28 days of observation. A method for quantifying the effect of a sulphate medium on a cement matrix was proposed that enables the material durability to be predicted. The features of changes in the morphology of structural components after exposure to aggressive solution were determined by physical and chemical methods.

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Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

Cited by 18 publications

References 60 publications

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

Influence of Sulphate Attack on Properties of Modified Cement Composites

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