High power diode laser surface glazing of concrete

J. Lawrence, Lin Li

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This present work describes the utilization of the relatively novel high power diode laser (HPDL) to generate a surface glaze on the ordinary Portland cement (OPC) surface of concrete. The value of such an investigation would be to facilitate the hitherto impossible task of generating a durable and long-lasting surface seal on the concrete, thereby extending the life and applications base of the concrete. The basic process phenomena are investigated and the laser effects in terms of glaze morphology, composition, and microstructure are presented. Also, the resultant heat effects are analyzed and described, as well as the effects of the shield gases, O2 and Ar, during laser processing. HPDL glazing of OPC was successfully demonstrated with power densities as low as 750 W cm-2 and at scanning rates up to 480 mm min-1. The work showed that the generation of the surface glaze resulted in improved mechanical and chemical properties over the untreated OPC surface of concrete. Both untreated and HPDL glazed OPC were tested for pull-off strength, rupture strength, water absorption, wear resistance, and corrosion resistance. The OPC laser glaze exhibited clear improvements in wear, water sorptivity, and resistance (up to 80% concentration) to nitric acid, sodium hydroxide, and detergent. Life assessment testing revealed that the OPC laser glaze had an increase in actual wear life of 1.3-14.8 times over the untreated OPC surface of concrete, depending upon the corrosive environment.

Original languageEnglish
Pages (from-to)116-125
Number of pages10
JournalJournal of Laser Applications
Volume12
Issue number3
DOIs
Publication statusPublished - 25 May 2000
Externally publishedYes

Keywords

  • Cement
  • Concrete
  • Glazing
  • High power diode laser
  • HPDL

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Instrumentation

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