The making of Class C fly ash as high-strength precast construction material through geopolymerization
AffiliationUniv Arizona, Dept Min & Geol Engn
MetadataShow full item record
PublisherSpringer Science and Business Media LLC
CitationZhang, J., & Feng, Q. (2020). The making of Class C fly ash as high-strength precast construction material through geopolymerization. Mining, Metallurgy & Exploration, 1-14.
JournalMINING METALLURGY & EXPLORATION
RightsCopyright © Society for Mining, Metallurgy & Exploration Inc. 2020.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractA study has been carried out to apply fly ash as a high strength, water-resistant precast construction material through geopolymerization. Experiment results show that the working conditions such as water content, the concentration of NaOH, curing temperature, and curing time significantly affect the mechanical property of geopolymer matrix. Through optimization, an above-100 MPa compressive strength has been achieved with the geopolymerization products. The optimum working conditions involves 10 M NaOH concentration, 14-15% water content, and curing at 90 degrees C in an oven for 1 day or at ambient condition for 3 weeks. Adding Ca(OH)(2)does not help to increase the compressive strength of the specimen. Water soaking tests show that the geopolymerization product has a very high water resistance without losing noticeable compressive strength, even after a 1-month soaking time. To elucidate the geopolymerization mechanism, microscopic techniques such as SEM/EDS (scanning electron microscopy and energy-dispersive X-ray spectroscopy), XRD (X-ray diffraction) and ATR-FTIR (attenuated total reflectance Fourier transform infrared) are also applied to investigate the microstructure, the elemental and phase composition of geopolymerization products. The findings of the present work provide a novel method for applying fly ash as a high-strength water-resistant precast construction material.
Note12 month embargo; published: 17 August 2020
VersionFinal accepted manuscript