**4. Conclusions**

In this research, biochar derived from date palm waste was used as an additive to concrete at the different mass compositions of 0.25 wt% to 1.5 wt%. The performance of biochar-concrete specimens derived from date palm waste was examined by the fresh concrete specimen's representative mechanical and durability characteristics. The following conclusions can be drawn based on the outcomes:


**Author Contributions:** Conceptualization, K.K. and M.Z.; Data curation, M.A.A. and M.N.A.; Formal analysis, M.A.A., M.Z. and M.N.A.; Funding acquisition, K.K.; Investigation, M.A.A. and M.Z.; Methodology, M.A.A. and M.Z.; Project administration, K.K.; Resources, K.K.; Supervision, K.K.; Validation, M.A.A., M.Z. and M.N.A.; Visualization, M.A.A. and M.N.A.; Writing—original draft, K.K., M.A.A., M.Z. and M.N.A.; Writing—review & editing, K.K. and M.Z. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the Al Bilad Bank Scholarly Chair for Food Security in Saudi Arabia, the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia [Grant No. CHAIR73]. The APC was funded by the same [GRANT No. CHAIR73].

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

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data used in this research has been appropriately cited and reported in the main text.

**Acknowledgments:** The authors acknowledge the Al Bilad Bank Scholarly Chair for Food Security in Saudi Arabia, the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia, for the financial support (Grant No. CHAIR73).

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