High-performance sonic impulses—an alternative method for processing of concrete

Linß, Elske; Mueller, Anette

doi:10.1016/j.minpro.2004.08.016

Cited by 41 publications

(12 citation statements)

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“…Table 12 presents a brief description to each of these methods. • Electrical energy is transformed into mechanical energy in the form of sonic impulses generated underwater, which are applied to RCA in a water-filled container • The sonic waves generate pressure and tensile stresses between aggregate and old cement mortar, destroying their bond • The particle size reduces and the adhered cement paste separates from the aggregates • Quality and particle size of the end product can be controlled by varying the number of impulses and voltage (Linß and Mueller, 2004) (Maeda et al, 2008) (Narahara et al, 2007) Microwave heating…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Silva

Dhir

2017

Journal of Cleaner Production

208

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Link to publication on Research at Birmingham portal General rightsUnless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law.• Users may freely distribute the URL that is used to identify this publication.• Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research.• User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain.Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document.When citing, please reference the published version. Take down policyWhile the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Silva

Dhir

2017

Journal of Cleaner Production

208

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“…IN addition to conventional mechanical and explosive drilling and demolition of rocks, drilling based on the use of pulsed electric power has been the subject of intense investigation [1,2] and commercial applications have begun to emerge [3][4][5][6], motivated by the relatively low specific energy consumption (cf. Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…In the first, a discharge in the dielectric/water outside the rock is generated. This excites a sonic impulse/pressure wave which breaks the surface of the rock/concrete [4].…”

Section: Introductionmentioning

confidence: 99%

Solid state modulator for plasma channel drilling

Biela

Marxgut

Bortis

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

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In addition to conventional drilling and demolition techniques, drilling with pulsed electric power has been investigated intensively, and commercial applications have begun to emerge. The most efficient method, often called plasma channel drilling (PCD), uses electrical pulses to generate a plasma channel in the rock. The expansion of this channel within the rock performs the demolition. The technique relies on that fact that for fast pulse rise-times (50 ns -500 ns) the breakdown field-strength of water is higher than that of rock, so that the discharge takes place in the rock. To date, in publications dealing with this topic, plasma dynamics, crack formation, and setup of the electrodes are the primary areas of investigation. In these investigations, the high voltage pulses have been generated using modulators based on spark gaps: either as single-switch or in a Marx-generator setup. These modulators are able to generate high voltages and high currents simultaneously, but the PCD method does not require high currents for igniting the discharge. Meanwhile, after ignition the voltage across the arc is relatively small. Thus these modulators are oversized. In this paper, a new concept, consisting of a solid state modulator which generates a high-voltage pulse for ignition, and a high output-current to expand the plasma, is presented. The solid state modulator consists of a single semiconductor switch, saturable inductors and a pulse transformer. In addition to being more compact, the solid state approach has improved lifetime and reliability compared to approaches using spark gap switches.

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“…Shima et al [12] studied thermal treatments combined with abrasion for improving the purity of RCA. An electrical impulse method [13,14] was studied as an innovative tool for improving the quality of RCA. Bru et al developed a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste [15].…”

Section: Introductionmentioning

confidence: 99%

Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe₃O₄ Suspension

Kang

Kee

2017

Advances in Materials Science and Engineering

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The primary objectives of this study are to investigate the feasibility of a heavy media separation process with magnetite (Fe3O4) suspension for upgrading the quality of mixed recycled coarse aggregates from construction and demolition waste (CDW) in Korea and to determine a range of effective operating density of Fe3O4 suspension for producing high-quality RCA acceptable to structural concrete applications. For the purposes, six 200 kg recycled coarse aggregates (RCAs) samples were collected from a conventional recycling plant in Korea. Subsequently, the samples were processed by a heavy media separation process using Fe3O4 suspensions with various densities from 2.65 g/cm3 to 2.40 g/cm3 with an interval of 0.05 g/cm3. Next, a series of tests was performed in the laboratory to evaluate properties of finished sink and float products from the HMS processes, including oven-dry density, absorption capacity, and physical durability. Furthermore, compressive strength of concrete cylinders (150 mm by 300 mm) made of the finished sink products from Fe3O4 suspensions with three different densities (2.4, 2.5, and 2.6 g/cm3) was tested in this study. As a result, it was demonstrated that the HMS process using Fe3O4 suspension with a density ranging between 2.40 and 2.65 g/cm3 was effective for upgrading mixed CDW RCAs in Korea to high-quality RCAs acceptable for structural concrete applications.

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High-performance sonic impulses—an alternative method for processing of concrete

Cited by 41 publications

References 0 publications

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Solid state modulator for plasma channel drilling

Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe₃O₄ Suspension

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High-performance sonic impulses—an alternative method for processing of concrete

Cited by 41 publications

References 0 publications

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Availability and processing of recycled aggregates within the construction and demolition supply chain: A review

Solid state modulator for plasma channel drilling

Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe3O4 Suspension

Contact Info

Product

Resources

About

Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe₃O₄ Suspension