**5. Conclusions**

Regarding the CFRC with different proportions of normal carbon fiber, recycled carbon fiber, and carbon fiber without coupling agen<sup>t</sup> under static and impact tests several conclusions can be stated as follows.


recycled to carbon fibers and applied to reinforced structures such as bridge expansion joints, tunnels, dams, airport and highway pavements, etc.

**Author Contributions:** Conceptualization, Y.-F.L.; data curation, J.-Y.L. and G.K.R.; formal analysis, J.-Y.L. and G.K.R.; investigation, J.-Y.L., and G.K.R.; methodology, Y.-F.L., S.-M.C. and M.-Y.S.; project administration, Y.-F.L. and C.-H.H.; supervision, Y.-F.L., S.-M.C. and Y.-K.T.; writing—original draft, J.-Y.L., and G.K.R.; writing—review and editing, Y.-F.L., S.-M.C., M.-Y.S., Y.-K.T. and C.-H.H. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Ministry of Science and Technology of Taiwan government, under contract No. MOST—108-2218-E-027—005, and the "Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors" from the Ministry of Education in Taiwan under contract No. L7091101-19.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

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