The Effect of NaOH Molarity and Alkali Activator Ratio on The Properties of GGBFS-Based Geopolymer as a fully Cement Replacement

Authors

  • Ahmed Ashour Rhouma Abdulnabi Civil Engineering Department, Faculty of Engineering, University of Tripoli, Tripoli, Libya Author

Keywords:

Geopolymer, GGBFS, Alkali-activator, Setting time, Compressive strength

Abstract

The cement sector is one of the largest CO2 emitters worldwide, which creates the need for sustainable alternatives. This study explores the use of GGBFS as a 100% replacement for cement to prepare geopolymer binders. The influence of molarity of NaOH (5M, 10M, 15M), ratio of NaOH/Na2SiO3 (0.5–3) on setting time, soundness and compressive strength were studied. The results indicate that raising molarity and ratio considerably reduces setting times. Drop in initial set for 16 minutes at 15M. All blends demonstrated satisfied volume stability. The 10M mix gained 43.48 N/mm2 at 28 days, 52% improvement compared to OPC. The study validates GGBFS geopolymers as a potential high performance sustainable alternative to cement.

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Published

2026-05-12

Issue

Volume 4, No. 2, 2025

Section

Applied Sciences Theme

License

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Ahmed Ashour Rhouma Abdulnabi. (2026). The Effect of NaOH Molarity and Alkali Activator Ratio on The Properties of GGBFS-Based Geopolymer as a fully Cement Replacement. Afro-Asian Journal of Scientific Research (AAJSR), 4(2), 280-285. https://aajsr.com/index.php/aajsr/article/view/929