The study of adhesion of repair materials on concrete structures implies a good knowledge of the influence of concrete surface treatment. The effects of surface preparation technique is rarely clearly described and parameterised: it is consequently difficult to point out the real influence of roughness on adhesion results. A large research project has been realized with regards to the influence of concrete substrate strenght and preparation technique efficiency. A new technique has been used in order to quantify the surface roughness of concrete: the projection “moiré” technique is an interfer-ometrical measurement method. The “moiré» phenomenon appears when two networks of light rays, made of equidistant lines - alternatively opaque and transparent -, are superimposed.
The technique of identification of relief is based on the deformation’s measurement of a parallel fringes pattern projected on a surface. A software analysis system RugoDS has been written and geometrical and statistical parameters have been calculated. Abbott's curves give interesting answers to differentiate surface preparation effects. Comparison between polished, scarified, sandblasted and hydro-jetted surfaces evaluation is presented.

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1. On the effect of concrete substrate roughness on stress wave propagation in repair systems