**7. Patents**

No. PL225785: Method for the calibration of measuring rings used for measuring their deformability in result of the shrinking strain of poured-in materials and the system for the calibration of measuring rings used for measuring their deformability as a result of the shrinking strain of poured-in materials.

**Author Contributions:** Conceptualization, A.Z. and M.K.; methodology, A.Z.; software, A.Z.; validation, A.Z.; formal analysis, A.Z.; investigation, A.Z., M.K.; writing—original draft preparation, A.Z., M.K.; writing—review and editing, A.Z., M.K.; supervision, A.Z., M.K. 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 recognize the Faculty of Civil Engineering and Architecture of West Pomeranian University of Technology Szczecin and thank for enabling the research described in this article. We thank our technician Ryszard Wojtaszewski and reviewer Dr. Patryk J. Wolert whose suggestions greatly improved this manuscript.

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