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Laser-Based Cutting of Contaminated Concrete

[+] Author Affiliations
Philip L. Crouse, Lin Li

Laser Processing Research Centre, Manchester, UK

Julian T. Spencer

BNFL, Warrington, England

Paper No. ICEM2003-4731, pp. 705-715; 11 pages
doi:10.1115/ICEM2003-4731
From:
  • ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation
  • 9th ASME International Conference on Radioactive Waste Management and Environmental Remediation: Volumes 1, 2, and 3
  • Oxford, England, September 21–25, 2003
  • Conference Sponsors: Nuclear Engineering Division and Environmental Engineering Division
  • ISBN: 0-7918-3732-7 | eISBN: 0-7918-3731-9
  • Copyright © 2003 by ASME

abstract

A number of laser-based techniques applicable to nuclear decontamination and decommissioning have emerged from LPRC-UMIST and BNFL research projects. The most recent process is deep-section concrete cutting, which promises to yield cutting depths of 1 m and beyond, and which affords very easy waste containment. This paper reports work in deep-section concrete cutting effected by layer-by-layer laser melting of the concrete with mechanical removal of the vitrified dross between passes. It is particularly suited to radioactive substrates where containment of the waste stream is imperative. Slightly higher power densities than e.g. for laser scabbling are required for this application. A comparison of experimental results using high-power CO2 (10.6 μm) and diode (0.808 + 0.940 μm ) lasers under roughly equivalent experimental conditions, cutting to depths of >100 mm, is presented. A marked improvement in cutting depth per pass is observed for the case of the diode laser. The increased cutting rate is rationalised in terms of the combined effects of coupling efficiency and beam shape. Pertinent features of the effluent are discussed.

Copyright © 2003 by ASME
Topics: Lasers , Concretes , Cutting

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