High power diode laser surface glazing of concrete

Lawrence, Jonathan and Li, Lin (2000) High power diode laser surface glazing of concrete. Journal of Laser Applications, 12 (3). pp. 116-125. ISSN 1042-346X

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Abstract

This present work describes the utilisation 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 affects are analysed 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 to 14.8 times over the untreated OPC
surface of concrete, depending upon the corrosive environment.

Item Type:Article
Additional Information:This present work describes the utilisation 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 affects are analysed 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 to 14.8 times over the untreated OPC surface of concrete, depending upon the corrosive environment.
Keywords:high power diode laser (HPDL), concrete, cement, glazing
Subjects:H Engineering > H680 Optoelectronic Engineering
H Engineering > H700 Production and Manufacturing Engineering
Divisions:College of Science > School of Engineering
ID Code:3194
Deposited By:INVALID USER
Deposited On:09 Aug 2010 12:43
Last Modified:13 Mar 2013 08:44

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