Concrete crushing based on the high-voltage pulse discharge technology

Wang, Xiaodong; Li, Ningjing; Du, Jiaxu; Wang, Wenqi

doi:10.1016/j.jobe.2021.102366

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…Although the energy conversion efficiency from Ec to Epl decreased correspondingly, the absolute amount of Epl still kept an increasing trend as well as the plasma energy density, Dpl. Phenomenological scaling relations, (10) and (15), were used to describe the dependency of Rpl and Dpl on Vpl.…”

Section: Discussionmentioning

confidence: 99%

“…The tendency shown in Fig. 11(a) can be described by a relation established using (10) and the electrical energy distribution relationship between Rpl and Rcir. Such a relation can be derived as following:…”

Section: Dependency Of Plasma Energy Density On Breakdown Voltagementioning

confidence: 99%

“…Also, their bandwidth covers a large range of frequency from hundreds of Hz to tens of MHz [2]. Therefore, UPSD, as a promising underwater acoustic source, has been used widely in, for example, medical shock wave crushing, petroleum and gas extraction, rock crushing, waste water treatment, marine exploration and other fields [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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The guiding effect of artificially injected gas bubble on the underwater pulsed spark discharge and its electrical and acoustic parameters after breakdown

et al. 2022

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The presence of a low density area is beneficial to the facilitation of the underwater pulsed spark discharge, which can be achieved by artificially injecting gas bubble in between the inter-electrode gap. The generation of intensive acoustic waves by such gas-bubble-guided spark discharges makes them promising underwater acoustic sources in multiple practical applications. This paper is aimed at comprehensive investigation of the guiding effect of the injected bubble on the pre-breakdown process of underwater pulsed spark discharges and potential correlations between their subsequent electrical and acoustic parameters with the purpose of optimizing the acoustic emission. The breakdown probability and the pre-breakdown delay were used to evaluate the general facilitation effect brought by the injected bubble. Experimental and numerical works have been conducted and allow observation on the dynamics of the injected bubble under the influence of the applied voltage. Different guiding modes of the injected bubble for plasma streamers' propagation have been observed regarding its relative position. The characteristics of the electrical properties of gas-bubble-guided spark discharges, including the plasma resistance and the plasma energy density, were analyzed by relating them with the breakdown voltage. The dependency of the acoustic wave amplitude and the acoustic efficiency on these electrical parameters was verified, which provides solid regulation principles for the optimization of the plasma-acoustic system for target practical applications.

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Section: Discussionmentioning

confidence: 99%

Section: Dependency Of Plasma Energy Density On Breakdown Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The guiding effect of artificially injected gas bubble on the underwater pulsed spark discharge and its electrical and acoustic parameters after breakdown

et al. 2022

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“…Q. Xue [11] utilized COMSOL v. 2021 software to simulate the fracture of rocks using HVPD, revealing that the rock crushing area increases with higher voltage and decreases with greater electrode spacing. N. Li [12] simulated and analyzed the whole process of concrete being subjected to shock waves generated using HVPD. L. Che [13] conducted numerical simulation and experimental research of hard-rock breaking using HVPD, examining using two parameters: electrode gap and hard rock type.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

Wang,

Sun,

Wang

2023

Buildings

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High-voltage pulse discharge (HVPD) in liquid technology, when applied to the demolition of concrete structures, has the advantages of green environmental protection, saving energy, emission reduction, safety, reliability, etc. However, research on the influence law of various factors on the effect of crushing is still insufficient. Therefore, this manuscript equated the shock load caused by HVPD to the blasting load and introduced a cohesive zone model based on ABAQUS. The whole process of a concrete column being subjected to a shock wave generated by pulse power discharge was simulated and analyzed. To validate the model’s reasonableness, a comparison and analysis were conducted with the results of experimental studies on concrete column fractures caused by HVPD in liquid. The study further investigated the influence of three parameters—one-side longitudinal reinforcement ratio, volume hoop ratio, and concrete grade strength—on the degree of fracture of the concrete column with a single row of holes (i.e., the width of transverse cracks or longitudinal cracks around the drilled holes). The simulation results revealed that the width of transverse cracks decreases significantly with the increase in the one-side longitudinal reinforcement ratio of the column, while the width of longitudinal cracks decreases substantially with the increase in the volume hoop ratio of the column. In addition, the degree of fracture of concrete columns decreases slightly with the increase in the concrete grade strength. Based on the simulation results, the mathematical expressions between the crack widths (transverse crack width and longitudinal crack width) and the key parameters, such as the one-side longitudinal reinforcement ratio of the column, volume hoop ratio of the column, and concrete grade strength, were established, respectively. These expressions facilitate their practical application in engineering practice.

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“…Bluhm et al from the Karlsruhe Research Center in Germany developed a semi-industrial prototype for concrete crushing and recycling. e equipment can be used to recycle large volumes of concrete after crushing, and the working efficiency can reach 1000 kg/h [4]. After 2000, the Russian Academy of Sciences has developed a HPVD device which can be used for the crushing of electrohydraulic effect.…”

Section: Introductionmentioning

confidence: 99%

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

Wang

2021

Advances in Civil Engineering

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High-voltage pulse discharge (HVPD) is an energy-saving, efficient, and green technique, which has broad prospects in concrete crushing. The finite element models of the concrete beam, slab, and column segments were established with ANSYS/LS-DYNA finite element software. Based on the principle of equal impact pressure, the shock wave generated by the fuse explosion caused by HVPD of 50 kJ is equivalent to the impact load of explosive blasting, and the stress of concrete beam segment was analyzed. The finite element models of the concrete beam sections were established to investigate the influence of diameter and spacing of the holes on the crushing effect of concrete beam segments. The width × height of each beam segment is 400 mm × 800 mm, and there are six types of beam segment length: 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, and 1100 mm. Two holes are drilled vertically on the surface of the width × length of each beam segment. The spacing of holes corresponding to beam segments of each length type is 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, and 700 mm, respectively. The hole depth of each beam segment is 650 mm, and there are three types of aperture: 30 mm, 50 mm, and 70 mm. The analysis results show that the crushing effect of concrete beam segments increases with the increase of aperture and the decrease of hole spacing. According to the crushing effect of the beam segments, the aperture of 50 mm, the spacing of 400 mm, and the hole end (edge) spacing of 250 mm were determined as the optimal hole layout scheme. The finite element models of concrete slabs and columns were established. The square concrete slab thickness is 140 mm and side length is 700 mm, 800 mm, and 900 mm, respectively. Double-row holes were arranged in the slabs and the aperture is 50 mm and the hole spacing is 200 mm, 300 mm, and 400 mm, respectively. The section sizes of concrete columns are 500 mm × 500 mm, 600 mm × 600 mm, and 700 mm × 700 mm, respectively, and the aperture is 50 mm and the hole distance is 400 mm. According to the results of analysis, the optimal hole distribution scheme of concrete slab and column is chosen as the aperture of 50 mm and hole distance of 400 mm. The principle of the layout of multirow holes is that the spacing of row is not more than 400 mm, and the margin is not more than 250 mm.

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Concrete crushing based on the high-voltage pulse discharge technology

Cited by 5 publications

References 13 publications

The guiding effect of artificially injected gas bubble on the underwater pulsed spark discharge and its electrical and acoustic parameters after breakdown

The guiding effect of artificially injected gas bubble on the underwater pulsed spark discharge and its electrical and acoustic parameters after breakdown

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

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