Electrical conductivity and dielectric property of fly ash geopolymer pastes

• Main Authors: Sakonwan Hanjitsuwan, Prinya Chindaprasirt, Kedsarin Pimraksa
• Format: Journal
• Published: 2018
• Subjects: Earth and Planetary Sciences; Engineering; Materials Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=79956095818&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/49909
• Institution: Chiang Mai University

The electrical conductivity and dielectric property of fly ash geopolymer pastes in a frequency range of 100 Hz-10 MHz were studied. The effects of the liquid alkali solution to ash ratios (L/A) were analyzed. The mineralogical compositions and microstructures of fly ash geopolymer materials were also investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The 10 mol sodium hydroxide solution and sodium silicate solution at a sodium silicate-to-sodium hydroxide ratio of 1.0 were used in making geopolymer pastes. The pastes were cured at 40°C. It is found that the electrical conductivity and dielectric constant are dependent on the frequency range and L/A ratios. The conductivity increases but the dielectric constant decreases with increasing frequency. © 2011 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.