Paper Title:

Optimization of Alkaline Activator/Fly ASH Ratio on the Compressive Strength of Manufacturing Fly ASH-BASED Geopolymer

Periodical Applied Mechanics and Materials (Volumes 110 - 116)
Main Theme Mechanical and Aerospace Engineering, ICMAE2011
Chapter Chapter 3: Powder Metallurgy and Ceramic Forming
Edited by Wu Fan
Pages 734-739
DOI 10.4028/
Citation Abdullah Mohd Mustafa Al Bakri et al., 2011, Applied Mechanics and Materials, 110-116, 734
Online since October 2011
Authors Abdullah Mohd Mustafa Al Bakri, H. Kamarudin, Omar A.K.A. Abdulkareem, Che Mohd Ruzaidi Ghazali, A.R. Rafiza, M.N. Norazian
Keywords Alkaline Activator/Fly Ash Ratio, Compressive Strength, Geopolimerization, Geopolymer
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Fly ash and a mixture of alkaline activators namely sodium silicate (Waterglass) and sodium hydroxide (NaOH) solution were used for preparing geopolymer. The aim of this research is to determine the optimum value of the alkaline activator/fly ash ratio. The effect of the oxide molar ratios of SiO2/Al2O3, water content of the alkaline activator and the Waterglass% content were studied for each Alkaline activator/fly ash ratio. The geopolymers were synthesized by the activation of fly ash with alkaline solution at three different alkaline activator/fly ash ratios which were 0.3, 0.35, and 0.4 at a specific constant ratio of waterglass/NaOH solution of 1.00. The geopolymers were cured at 70°C for 24 h and cured to room temperature. Results revealed that the alkaline activator/fly ash ratio of 0.4 has the optimum amount of alkaline liquid, which shows the highest rate of geopolymerization compared to other ratios. A high strength of 8.61 MPa was achieved with 0.4 of activator/fly ash ratio and 14% of waterglass content.