Compressive Strength Development of Geopolymer Mortar by Utilization Slag and Fly Ash Mixtures
Otman M. M. Elbasir1, M. J. A. Mijarsh2, Megat Azmi Megat Johari3, Zainal Arifin Ahmad4, Mohamed O. M. Mashri5

1Otman M. M. Elbasir, High Institute of Science and Technology, Civil Engineering Department, Qaser bin Gashear (Libya).
2M. J. A. Mijarsh, Civil Engineering Department, Faculty of Engineering, ElMergib University, Al-Khums (Libya).
3Megat Azmi Megat Johari, School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang (Malaysia).
4Zainal Arifin Ahmad, Structural Materials Niche Area, School of Materials and Mineral Resources.
5Mohamed O. M. Mashri, School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang (Malaysia) and College of Technical Sciences-Bani Walid.
Manuscript received on November 22, 2019. | Revised Manuscript received on December 15, 2019. | Manuscript published on December 30, 2019. | PP: 4066-4069 | Volume-9 Issue-2, December, 2019. | Retrieval Number:  B4946129219/2019©BEIESP | DOI: 10.35940/ijeat.B4946.129219
Open Access | Ethics and Policies | Cite | Mendeley
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (

Abstract: The paper displays the use of two base solid wastes materials to produce the alkaline-activated binder mortar to reduce the CO2 emission on climate change. The solid materials used in this research were slag and fly-ash to improve the compressive strength (CS) of alkaline activated mortar (AAM). The output AAM of 7 trial mixes were designed with different combinations of slag and fly ash. The mixes combinations were made in ratios of (100:0), (90:10), (80:20), (70:30), (50:50), (25:75), and (0:100), respectively. The combination of 10 M NaOH and Na2SiO3 was used as alkaline activator (AA). The wt. ratio of Na2SiO3 to NaOH = 2.5, and wt. ratio of AA to solid material = 0.52. The samples of AAM were cured at 75°C for 24 h. Among all the 7 trial mixtures, it was found that mixture with a combined ratio of slag:fly ash of 25:75 produce the maximum CS at 28 days of 88.87 MPa. Therefore, the alteration percentage of SiO2 and Al2O3 derived from fly ash in combination with CaO derived from slag contributed to significant CS improvement due to the formation of (N-A-S-H), (C-S-H) and (C-(A)-S-H) gels. The result observed of gel binder formation was confirmed by XRD and FESEM analyses.
Keywords: Fly Ash (FA); Slag (GGBFS); Alkaline Activated Mortar (AAM); Compressive Strength (CS).