**4. Conclusions**

Instead of traditional roughness parameters, objective statistical parameters were introduced. Thus, a unique random representation of the tested sample was achieved and the randomness of the surface texture was reproduced. Moreover, the sample can be reproduced with random field generation and used if access to the test surface is limited. This feature responds to the need for the non-destructive assessment of strength parameters solely based on concrete surface topography.

Although the developed procedure was tested on a limited number of samples, it exhibited versatile character. The method can be adjusted to the available equipment and field or laboratory conditions. Data collection to create a digital surface model can use any technique (with satisfactory accuracy) and the parameters can be adjusted to the available test data. Although, presented samples did not require much numerical e ffort, it should be noted that the point cloud size a ffects the time of numerical calculations.

There exist some limitations of the method applied in this paper, including the need for shadow-free illumination of the sampled element for correct CRP data collection and the use of licensed CRP software. Moreover, despite the simple in situ measurement procedure, the processing time for the model to be obtained can be too long and can a ffect the time of the construction work. An important feature of this method is a resistance to local texture changes, gaps, aggregate sharp edges, etc., but at the same time these imperfections are relativized and local heterogeneity diminishes because deterministic data are lost. In future research, the influence of surface processing on the semivariogram type should be examined. A full quantitative approach is recommended in the revision of design codes.

**Author Contributions:** Conceptualization, J.K., R.W. and M.W.; methodology, J.K., Z.M., M.W. and J.S.; software, J.K.; validation, R.W., Z.M., M.W. and J.S.; formal analysis, J.K., Z.M., M.W. and J.S.; investigation, J.K., R.W., Z.M., M.W. and J.S.; resources, R.W., Z.M. and J.S.; data curation, J.K., Z.M. and J.S.; writing—original draft preparation, J.K., R.W., Z.M., M.W. and J.S.; writing—review and editing, J.K., R.W., Z.M.; visualization, J.K., Z.M. and J.S.; supervision, J.K., R.W.; project administration, J.K., R.W. and M.W.; funding acquisition, J.K., R.W. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors would like to thank Anna Pawlik and Anna Szalc for their help in making and curing the samples.

**Conflicts of Interest:** The authors declare no conflict of interest.
