Effect of Oil Palm Fiber Content on the Physical and Mechanical Properties and Microstructure of High-Calcium Fly Ash Geopolymer Paste

  • Wunchock Kroehong
  • Chai Jaturapitakkul
  • Thanyawat Pothisiri
  • Prinya Chindaprasirt
Research Article - Civil Engineering


This paper investigates the effect of oil palm fiber content on the physical and mechanical properties and microstructure of high-calcium fly ash geopolymer paste. The oil palm fiber was added to the mixture at 0, 1, 2, and 3% by weight of fly ash. Sodium hydroxide (NaOH) and sodium silicate \((\hbox {Na}_{2}\hbox {SiO}_{3})\) were used as liquid alkaline activators. The bulk density, compressive strength, flexural strength, pore size distribution, scanning electron microscopy, and thermal conductivity of geopolymer paste were determined. Test results showed that the bulk density of high-calcium geopolymer paste containing oil palm fibers decreased with increasing fiber content. The increase oil palm fiber content decreased the compressive strength of geopolymer paste but enhanced the flexural strength and toughness and changed the failure behavior of geopolymer composite. In addition, the pore size and total porosity also increased with the increase in fiber content, while the thermal conductivity was reduced. The addition of oil palm fiber can improve the flexural strength and thermal conductivity of geopolymer paste and could thus be developed into a fiber-reinforced composite for construction purposes.


Geopolymer Oil palm fiber Fly ash Flexural strength Pore size distribution Thermal conductivity 


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This work was supported under research funding from the Faculty of Engineering and Architecture, Uthenthawai Campus, Rajamangala University of Technology Tawan-ok, Thailand. Appreciation is also extended to the Thailand Research Fund (TRF) for financial support under the Grant No. DPG618002 and the TRF New Researcher Scholar, Grant No. TRG 5880064.


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Wunchock Kroehong
    • 1
  • Chai Jaturapitakkul
    • 2
  • Thanyawat Pothisiri
    • 3
  • Prinya Chindaprasirt
    • 4
    • 5
  1. 1.Department of Civil Engineering, Faculty of Engineering and Architecture, Uthenthawai CampusRajamangala University of Technology Tawan-okBangkokThailand
  2. 2.Department of Civil Engineering, Faculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkokThailand
  3. 3.Department of Civil Engineering, Faculty of EngineeringChulalongkorn UniversityBangkokThailand
  4. 4.Department of Civil Engineering, Sustainable Infrastructure Research and Development Center, Faculty of EngineeringKhon Kaen UniversityKhon KaenThailand
  5. 5.The Academy of ScienceThe Royal Society of ThailandDusit, BangkokThailand

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