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Materials 2015, 8(5), 2227-2242; doi:10.3390/ma8052227

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

1
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
2
Faculty of Engineering Technology, Uniciti Alam Campus, Universiti Malaysia Perlis, Sungai Chuchuh 02100, Padang Besar, Perlis, Malaysia
3
Faculty of Technology, Universitas Ubudiyah Indonesia, Jl. Alue Naga, Kec. Syiah Kuala Desa Tibang 23536, Banda Aceh, Indonesia
4
School of Environmental Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, Kangar 01000, Perlis, Malaysia
5
Faculty of Materials Science and Engineering, Gheorghe Asachi Technical University of Iasi, Blvd. D. Mangeron 41, Iasi 700050, Romania
*
Authors to whom correspondence should be addressed.
Academic Editor: Jérôme Chevalier
Received: 12 February 2015 / Revised: 13 April 2015 / Accepted: 17 April 2015 / Published: 28 April 2015
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Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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