Micro-scale alterations of cementitious surfaces subjected to laser process and their impact on long term durability

A.J. Klemm, P. Sanjeevan, P. Klemm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper presents part of the larger study on laser cleaning process. A special emphasis is placed on the modification of geometrical microstructure and chemical composition of cementitious composites resulting from cleaning process. A wide range of samples characterised with different internal microstructures, surface roughness, and moisture content were subjected to laser cleaning process, and a subsequent assessment. Removal of mortar, cracks and glassy patches were the characteristic features of all laser-cleaned areas. Cracks of wider openings may also form as a consequence of the expansion of water/air inside pores, predominantly smoother/denser mortars. The experimental results prove that the laser cleaning process leads to an increase of Si element concentration and/or decrease in Ca concentration. The observed alterations should be associated with changes in the relative distribution of melted cement paste and aggregate and therefore relative elemental abundance in the near-surface layer.
Original languageEnglish
Title of host publicationConcrete Repair, Rehabilitation and Retrofitting II
EditorsMark G. Alexander, Hans-Dieter Beushausen, Frank Dehn, Pilate Mayo
Place of PublicationLondon
PublisherTaylor & Francis Group
Pages129-130
Number of pages2
ISBN (Electronic)978-1-4398-2840-3
ISBN (Print)978-0-415-46850-3
DOIs
Publication statusPublished - 2009

Keywords

  • laser
  • laser cleaning
  • cementitious composites

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