The Influence of NaOH Concentration on Molar Ratios of Palm Oil Boiler Ash Based Geopolymer

Abstract:

Palm oil boiler ash (BA) has been synthesis with alkaline activator to produce boiler ash based geopolymer. The ratio of BA/alkaline activator and Na₂SiO₃/NaOH was fixed for the entire experiment, where six different of NaOH concentration (6 M, 8 M, 10 M, 12 M, 14 M, 16 M) was used to produce geopolymer paste. The compressive strength of geopolymer paste with NaOH concentration 14 M showed the maximum strength which is 13.9 MPa. The strength reduce when geopolymer paste used NaOH concentration more than 14 M. In term of molar oxides SiO₂/Al₂O₃ , Na₂O/SiO₂ and H₂O/Na₂O with the increasing of NaOH concentration Na₂O/SiO₂ ratio also increased but H₂O/Na₂O ratio decreased. Meanwhile SiO₂/Al₂O₃ ratio remain constant because the BA/alkaline activator and Na₂SiO₃/NaOH ratio were constant in this study. The XRD analysis illustrated that the value of 2θ for all geopolymer samples were approximately the same which is 27° with major components of quartz and minor component of cristobalite.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 245-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.245
• Online since: April 2015
• Authors: Yahya Zarina*, Hussin Kamarudin, Mohd Mustafa Al Bakri Abdullah, Khairul Nizar Ismail, Rafiza Abd Razak, Andrei Victor Sandhu
• Keywords: Boiler Ash, Geopolymer, Molar Oxides, Naoh Concentration, Palm Oil

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