**4. Conclusions**

In this experimental study, self-compacting concrete was produced with high replacement levels of OPC by SCMs. The results showed the ability to produce high-strength, highly durable concrete with a high quality of sustainability by reducing the OPC used in the SCC. Fly ash and GGBS were used as partial replacement materials with a constant quantity of microsilica. The following conclusions can be drawn based on the results registered from the experiments:

• In this investigation, GGBS and MS were able to be used at levels up to 71%. A sustainable and durable SCC was successfully produced.


**Author Contributions:** M.A.S., S.K.A., S.A., M.M.A.B.A., writing—original draft preparation; M.A.S., R.P.J., S.Z.A.R., I.H.A., I.N.A.T., writing—review and editing; M.A.S., supervision; M.M.A.B.A., S.Z.A.R., R.P.J., and I.N.A.T., funding acquisition. All authors have read and agreed to the published version of the manuscript.

**Funding:** The support provided by Universiti Malaysia Pahang (research grant number PDU213219) is highly appreciated.

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

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data are available in a publicly accessible repository.

**Acknowledgments:** The authors acknowledge the laboratory workers in TECH REMIX LLC Ajman, UAE; the Al-Furat Al-Awsat Technical University (ATU), Iraq; and Faculty of Chemical Engineering & Technology and Center of Excellence Geopolymer & Green Technology (CEGeoGTech) Universiti Malaysia Perlis for the support and give special thanks to those who contributed to this project directly or indirectly.

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