Reference : Effect of concrete surface treatment on adhesion in repair systems
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Civil engineering
Effect of concrete surface treatment on adhesion in repair systems
Garbacz, A. [> > > >]
Gorka, M. [> > > >]
Courard, Luc mailto [Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil >]
Magazine of Concrete Research
Thomas Telford Publishing
Yes (verified by ORBi)
[en] Existing concrete surfaces need to be roughened to a profile necessary to achieve mechanical interlocking with any repair material. In this study, different surface treatments (e.g. grinding, sandblasting, shotblasting, hand- and mechanical milling) were performed and the quality of the preparation established on the basis of three main parameters: surface geometry, superficial concrete microcracking and adhesion. Surface geometry was characterised on the basis of the measurement of surface profile-profilometry-and the analysis of statistical and amplitude parameters calculated from the waviness (lower frequencies) and the roughness (higher frequencies) profiles of the surface. Investigations were also performed to assess the quality of the superficial zone of concrete and cracks were systematically observed in relation to surface treatment where both scanning electron microscopy and light microscopy were used for analysis. Finally, a repair mortar with or without bond coat, was applied to the concrete substrates in order to measure adhesion. Relationships clearly show the effect of roughness on adhesion in the case where no bond coat was used and also the influence of the power of the surface treatment on the waviness shape of the profile and the presence of microcracks in the near-surface layer related to failure type.
Wallonie Bruxelles International

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