Ceramics-Silikáty 57, (4) 319 - 327 (2013) |
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INVESTIGATING THE EFFECTS OF OIL PALM ASH IN METAKAOLIN BASED GEOPOLYMER
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Hawa Abideng 2, Tonnayopas Danupon 1, Prachasaree Woraphot 2,
Taneerananon Pichai 2
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1 Department of Mining and Materials Engineering, Prince of Songkla University, 90112 Hatyai, Songkhla, Thailand
2 Department of Civil Engineering, Prince of Songkla University, 90112 Hatyai, Songkhla, Thailand
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Keywords: Compressive strength, Geopolymer, Oil palm ash, Drying shrinkage, Expansion
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This research reports on the microstructure, compressive strength, drying shrinkage and sulfate expansion of metakaolin
(MK) based geopolymers produced by partially replacing MK by oil palm ash (OPA) in proportions of 0 %, 5 %, 10 % and
15 % by weight. The specimens were cured at a temperature of 80oC for 1, 2 and 4 hours, and compressive strength test were
conducted at ambient temperature at 2, 6, 24 hours, 7 and 28 day. The testing results revealed that the geopolymer with 5 %
OPA gave the highest compressive strength. Scanning electron microscopy (SEM) indicated that the 5 % OPA sample had a
dense-compact matrix and less unreacted raw materials which contributed to the higher compressive strength. In the X-ray
diffraction (XRD) patterns, the change of the crystalline phase for higher strength was easily detectable compared lower
strength. |
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