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Effect of Solids-To-Liquids, Na2SiO3-To-NaOH and Curing Temperature on the Palm Oil Boiler Ash (Si + Ca) Geopolymerisation System

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Center of Excellence Geopolymer and Green Technology, School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, Kangar 01000, Perlis, Malaysia
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Faculty of Engineering Technology, Uniciti Alam Campus, Universiti Malaysia Perlis, Sungai Chuchuh 02100, Padang Besar, Perlis, Malaysia
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Faculty of Technology, Universitas Ubudiyah Indonesia, Jl. Alue Naga, Kec. Syiah Kuala Desa Tibang 23536, Banda Aceh, Indonesia
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School of Environmental Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, Kangar 01000, Perlis, Malaysia
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Faculty of Materials Science and Engineering, Gheorghe Asachi Technical University of Iasi, Blvd. D. Mangeron 41, Iasi 700050, Romania
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Authors to whom correspondence should be addressed.
Academic Editor: Jérôme Chevalier
Materials 2015, 8(5), 2227-2242; https://doi.org/10.3390/ma8052227
Received: 12 February 2015 / Revised: 13 April 2015 / Accepted: 17 April 2015 / Published: 28 April 2015
This paper investigates the effect of the solids-to-liquids (S/L) and Na2SiO3/NaOH ratios on the production of palm oil boiler ash (POBA) based geopolymer. Sodium silicate and sodium hydroxide (NaOH) solution were used as alkaline activator with a NaOH concentration of 14 M. The geopolymer samples were prepared with different S/L ratios (0.5, 1.0, 1.25, 1.5, and 1.75) and Na2SiO3/NaOH ratios (0.5, 1.0, 1.5, 2.0, 2.5, and 3.0). The main evaluation techniques in this study were compressive strength, X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscope (SEM). The results showed that the maximum compressive strength (11.9 MPa) was obtained at a S/L ratio and Na2SiO3/NaOH ratio of 1.5 and 2.5 at seven days of testing. v View Full-Text
Keywords: POBA; geopolymer; alkaline activator; NaOH; sodium silicate POBA; geopolymer; alkaline activator; NaOH; sodium silicate
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Yahya, Z.; Abdullah, M.M.A.B.; Hussin, K.; Ismail, K.N.; Razak, R.A.; Sandu, A.V. Effect of Solids-To-Liquids, Na2SiO3-To-NaOH and Curing Temperature on the Palm Oil Boiler Ash (Si + Ca) Geopolymerisation System. Materials 2015, 8, 2227-2242.

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