Parametric definition of sandblasted and polished concrete surfaces

A lot of considerations have been developed on the influence of surface roughness on the adherence of a repairing systems on a concrete support : sandblasting, hammering, hydroblasting, acid attacks,… have been analysed by a lot of authors.
This presentation gives a parametric interpretation of a sandblasted surface in comparison with a polished concrete.
A stylus is walked along the surface to be analysed and the profile is continuously registered.
The filtration of the electric signal is realised in order to separate waviness and roughness. The effect of the stylus/component profile contact on the validity of the measurement results is of prime importance.
Profilometry and surfometry are mathematically described by statistical and amplitude parameters. The analysis of surfometry profiles let us to observe and quantify the shape regularity and the isotropic effect of sandblasting. The bearing ratio curves permit to quantify the volume of voids able to absorb the slurry or the repairing mortar applied on the support.
The difference, between the two surface treatments is clearly quantified and related to adherence properties of some hydraulic binders.