Removal of surface layer of concrete by a pulse-periodical discharge

Gol'dfarb, V.M.; Budny, R. S.; Dunton, A.R.; Shneerson, G. A.; Krivosheev, S. I.; Adamian, Yu.

doi:10.1109/ppc.1997.674540

Cited by 7 publications

(4 citation statements)

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“…Pilot drilling and demolition systems were built showing the applicability of the method to numerous technologies. [7][8][9] Semkin et al 7 explained the breakdown of the nonuniform dielectrics through the enhancement of local electric field near solid inclusions of different material. However, from our point of view, even two or three fold field enhancement factor is not sufficient for the breakdown of solids having very high electric strength.…”

Section: Introductionmentioning

confidence: 99%

Breakdown and destruction of heterogeneous solid dielectrics by high voltage pulses

Lisitsyn

Inoue

Nishizawa

et al. 1998

Journal of Applied Physics

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Influences of reflow time and strain rate on interfacial fracture behaviors of Sn-4Ag/Cu solder joints J. Appl. Phys. 112, 064508 (2012) Early stages of mechanical deformation in indium phosphide with the zinc blende structure J. Appl. Phys. 112, 063514 (2012) Elucidating the mechanism for indentation size-effect in dielectrics Hardness, yield strength, and plastic flow in thin film metallic-glass J. Appl. Phys. 112, 053516 (2012) Development of nondestructive non-contact acousto-thermal evaluation technique for damage detection in materials Rev. Sci. Instrum. 83, 095103 (2012) Additional information on J. Appl. Phys.A mechanism explaining the breakdown of dielectrics with high intrinsic inhomogeneity like natural rocks and concrete is proposed and proved experimentally. This work has a very promising industrial application in the drilling and demolition of natural and artificial solid materials by electric pulses. The mechanism includes the breakdown of gas cavities inside the dielectric and on its surface. At a very high applied voltage, the high electric field causes the breakdown in the cavities. The displacement and conduction currents flowing through a number of such cavities result in the heating of the plasma and high pressure pulse generation. The pulsed pressure results in crack formation and finally, in the destruction of a solid material.

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Section: Introductionmentioning

confidence: 99%

Breakdown and destruction of heterogeneous solid dielectrics by high voltage pulses

Lisitsyn

Inoue

Nishizawa

et al. 1998

Journal of Applied Physics

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“…Previous work [1,5,8,11,13] on concrete and rock clearly demonstrate these materials will fracture from high electrical energy pulsing at ambient pressure. Their work focuses on using the technology for excavation and drilling augmentation.…”

Section: Discussionmentioning

confidence: 94%

“…In the second process, the electric current flows through the rock, preferentially along mineral grain interfaces that induce tensile and branching cracks at the boundary interfaces, either by heating and differential expansion or by a shock wave induced by the electrical impulse itself. Both processes have been examined experimentally on rock and concrete by multiple researchers [1][2][3][4][5][6][7][8][9][10][11][12][13]. However, the electrofracturing process has not previously been systematically evaluated at elevated pressures.…”

Section: Introductionmentioning

confidence: 99%

Electrofracturing of Shale at Elevated Pressure

Bauer,

Glover,

Williamson

et al. 2024

Energies

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Electrofracturing deeply buried shale formations could be used to increase reservoir permeability and improve reservoir production without requiring large volumes of freshwater. This paper describes a novel experimental system and initial test results to electrofracture shale under high confining pressures. Core-scale laboratory testing was performed on twelve rock samples recovered from a shale gas reservoir. Each sample was subjected to confining pressures of 20.7 MPa (3000 psi) or 58.6 MPa (8000 psi), representative of overburden pressures at depth. Samples were then subjected to application of high voltage until specimen fracture. The experiments produced deformed samples with multiple fracture types, both parallel and oblique to bedding planes. Electrofracturing increased permeabilities by up to nine orders of magnitude for extended time periods. Rock fracture and throughgoing fractures were demonstrated. Computed tomography images revealed the creation of fractures and tube/tunnel flow channels, which resisted closure under hydrostatic pressures up to 58.6 MPa. The breakdown energy and permeability changes in the sample were independent of applied confining pressure. The cumulative energy input required for fracture depended on applied confining pressure and sample length. The energy required to fracture samples up to 9 cm in length is generally more than 0.5 kJ/cm, but no greater than 1 kJ/cm. Our results show that electrofracture of shales under confining pressure is possible and could be a possible water-free mechanism for reservoir stimulation.

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“…1,2 The main advantage of the used pulsed power is that it is not only ecologically clean, 1,3 but also high efficient. 4,5 The destruction is realized under the following conditions: 6 Two electrodes are placed on the surface of a rock. The rock is immersed into a high permittivity liquid.…”

Section: Introductionmentioning

confidence: 99%

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

Zhang

Liu

et al. 2017

AIP Advances

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By conducting experiments for granite and sandstone samples under different conditions, such as voltage amplitude and electrodes gap, the discharge characteristics of high voltage pulses inside the rocks with increasing their applied number have been investigated. In each of the experiments, a certain value for voltage amplitude and electrodes gap is set separately and then, pulses are applied on same surface of the rocks continuously. The time dependent voltage between the electrodes, the current in plasma and the transient states around the electrode tips are measured and recorded separately when each of the pulses is applied. By means of the wave forms of the voltage and the current, variation laws of the discharging time and the energy release into the plasma with increasing applied pulses number have been obtained. The relation between the number of applied pulses and the critical condition of discharge inside of the rocks has been found. Further, the relation between the number of applied pulses required to discharge and the voltage amplitude has been also analyzed. The reasons of why increasing applied pulses number has such effects on discharge characteristics of them inside the granite and sandstone samples have been found and demonstrated.

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Removal of surface layer of concrete by a pulse-periodical discharge

Cited by 7 publications

References 0 publications

Breakdown and destruction of heterogeneous solid dielectrics by high voltage pulses

Breakdown and destruction of heterogeneous solid dielectrics by high voltage pulses

Electrofracturing of Shale at Elevated Pressure

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

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