The Effects of Microstructural Features of Mortars on the Laser Cleaning Process

Sanjeevan, Poologanathan; Klemm, Agnieszka J.; Klemm, Piotr

doi:10.1533/9780857093080.45

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…While the infl uence of microstructural features of surfaces on laser cleaning process has been previously researched [3,[8][9][10], the effect of laser radiation on characteristics of modifi ed cementitious surfaces has been slightly overlooked. Laser cleaning is often described as a self-limiting process.…”

Section: Introductionmentioning

confidence: 99%

Assessment of surface condition of cementitious materials subjected to laser radiation

Klemm¹,

Sanjeevan²,

Rożniakowski³

2013

Int. J. CMEM

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The paper is focused on the assessment of laser-treated cementitious surfaces. It forms part of the larger study on laser cleaning process and its effect on modifi cation of geometrical microstructure of cementitious composites. The great variation in absorptivity of highly developed surfaces of cementitious materials results in substantial differences in their responses to laser irradiation. Even though lasers can be successfully used to remove dirt from mortar surfaces, there are always some residual surface alterations associated with the removal of mortar, formation of cracks and glazing (melted mortar). Comprehensive understanding of surface processes resulting from laser interaction with substrate is essential in further industrial commercialisation of the technology. In order to address the problem a wide range of laser-treated samples with different internal microstructures, surface roughness and moisture content were studied. The characteristic features of all laser-cleaned areas included removal of mortar, formation of cracks and glassy patches. Systematic analysis of surface modifi cations resulting from laser cleaning confi rmed a strong relationship between initial roughness of surfaces and their end conditions. An increase in initial surface roughness leads to more pronounced alterations in roughness and reduced tendency towards crack formation.

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Section: Introductionmentioning

confidence: 99%

Assessment of surface condition of cementitious materials subjected to laser radiation

Klemm¹,

Sanjeevan²,

Rożniakowski³

2013

Int. J. CMEM

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“…Despite the fact that these effects are generally microscopic and only visible at high magnification, their importance should not be underestimated as they may expose surfaces to further accelerated environmental deterio-*Address correspondence to this author at the School of Built and Natural Environment, Glasgow Caledonian University, UK; Tel: +44 1413313892; Fax: +44 1413313696; E-mail: a.klemm@gcal.ac.uk ration. Lack of comprehensive knowledge of the effects of substrate parameters of cementitious materials during the laser cleaning process is one of the restrains still to be address Sanjeevan [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Laser Cleaning on Chemical Composition of Mortar Surfaces

Klemm

Sanjeevan²

2008

TOBCTJ

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Abstract:The paper presents a part of the larger study on microstructural features of mortars and their effects on laser cleaning process. It focuses on presenting the results of investigation on the influence of laser cleaning on chemical composition of mortar surfaces. 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. Furthermore, curing and service conditions of mortars seem to have strong influence on laser cleaning process and therefore on surface quality. Exposure to freezing/thawing cycles and subsequent surface damage facilitates deeper penetration of paint and consequently affects the efficiency of cleaning. The amount of residual carbon on F/T samples tested in the course of this study was around 42% higher than on the surfaces of laboratory-cured samples.

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

Klemm¹,

Klemm²

2008

Concrete Repair, Rehabilitation and Retrofitting II

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The Effects of Microstructural Features of Mortars on the Laser Cleaning Process

Cited by 4 publications

References 2 publications

Assessment of surface condition of cementitious materials subjected to laser radiation

Assessment of surface condition of cementitious materials subjected to laser radiation

Effects of Laser Cleaning on Chemical Composition of Mortar Surfaces

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

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