Reference : Effect of surface preparation techniques on the cohesion of superficial concrete: com...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Civil engineering
Effect of surface preparation techniques on the cohesion of superficial concrete: comparison between jack-hammering and water-jetting
Courard, Luc mailto [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil >]
Bissonnette, Benoît mailto [Université Laval, Québec, Canada > > > >]
Belair, Normand [ > > ]
Concrete Repair, Rehabilitation and Retrofitting
Beushausen, H.
Dehn, F.
Alexander, M. G.
Taylor & Francis Group
United Kingdom
International Conference on Concrete Repair, Rehabilitation and Retrofitting
21 - 23 November, 2005
Cape Town
South Africa
[en] concrete ; surface preparation ; microcracking
[en] The aim of concrete surface preparation is to obtain a surface with properties similar to those of the bulk concrete. Superficial concrete must be sound, dry, cohesive and contaminant-free. Particularly, the preparation must be performed in such a way that sound and homogeneous concrete is reached. The most widespread surface preparation techniques are sandblasting, jack-hammering, milling and other water hydro-jetting. Evaluation of the effect of surface preparation is often based upon surface roughness or specific sur-face. It is necessary however to investigate further within the first few centimetres from the surface to verify the concrete homogeneity and soundness. Pull-off test is a destructive method that can be useful for such evaluation, but it only gives an indication; the observation of the failure mode is more instructive. This paper summarizes the results of a microscopy investigation performed to quantify the number and length of cracks. The analysis leads to the comparison of jack-hammering and water-jetting techniques in terms of their poten-tial effect on superficial cohesion of concrete.

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