Usefulness of 3D surface roughness parameters for nondestructive evaluation of pull-off adhesion of concrete layers

• Usefulness of 3D surface roughness parameters for the evaluation of the pull-off adhesion was presented.
• Twenty-one 3D roughness parameters were identified.
• Correlations between 3D roughness parameters and pull-off adhesion were established.
• The values of Spearman’s rank correlation coefficient have confirmed the established correlations.
• It is advisable to support 3D laser scanning with other non-destructive methods.

The results of studies into the usefulness of 3D surface roughness parameters determined by 3D laser scanning, for the nondestructive evaluation of the pull-off adhesion of concrete layers are presented. Twenty-one 3D roughness parameters were identified. Their correlations with pull-off adhesion fb determined by the semi-nondestructive pull-off method were established. For two of the parameters, i.e. the texture aspect ratio (Str) and the peak material volume (Vmp) the correlation coefficient was found to be high. The possibility of the nondestructive evaluation of the pull-off adhesion on the basis of solely the existing concrete topography examinations is critically looked at.