**5. Conclusions**

This paper intended to present the study of the influence of the cement types CEMI and slag cement CEMIII, in which the GGBFS amount reaches 54%, on the mechanical and physical performances of heated concretes with riverbed (RB) and basalt (B) aggregates. Four concretes with the same volume of cement paste and mortar were investigated. The only parameter differentiating RB and B concretes was the cement type. Analysis of the experimental data obtained concerned the mechanical tests, stiffness, and the permeability test results of the four concretes subjected to high temperature exposure (up to 1000 ◦C). The following main conclusions were drawn:


**Author Contributions:** I.H. conception, T.T. and K.M. data curation, M.C. formal analysis, I.H. founding acquisition, T.T., M.C. and K.M. investigation, T.T. and M.C. methodology, I.H. project administration, I.H. supervision, I.H. and M.C. validation. I.H. and M.C. writing—original draft, I.H. M.C., T.T. and K.M. writing—review and editing.

**Funding:** The study was supported. This research was funded in part from the EMMAT project E-mobility and sustainable materials and technologies PPI/APM/2018/1/00027 financed by the Polish National Agency for Academic Exchange (NAWA) and Polish National Research Centre Grant "Multi-parameter assessment of cement concretes exposed to fire temperature" N N506045 040.

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