Treatment and Recovery of Clay Soils Using Geopolymerization Method
Publication: International Journal of Geomechanics
Volume 21, Issue 11
Abstract
This paper focuses on the effectiveness in the improvement of clay soils of using geopolymers of fly ash (FA), metakaolin (MK), or blast furnace slag, activated by an alkaline solution of sodium hydroxide (NaOH), sodium silicate (Na2SiO3), or a mixture of both. The unconfined compressive strength (UCS) of samples cured for 1, 7, and 28 days was determined, and X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier-transform infrared (FTIR) spectroscopy were performed to record the mechanical, chemical, and mineralogical behaviors of the stabilized soils. The results showed an increase from 149.72 kPa (untreated clay) to 460.06 kPa for the clay soil treated with NaOH after 1 day of hardening. The highest UCS was obtained using a MK-based geopolymer (MKG) at 28 days. Oedometric testing showed a reduction in the swelling potential of the clay soil and a decrease in the swelling pressure from 600 to 300 kPa. It was found that all the tested treatments significantly improved the geotechnical properties of the clay soil. However, the MKG treatment was most effective in terms of increased resistance, while the FA-based geopolymer (FAG) provided better results in terms of reducing swelling.
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International Journal of Geomechanics
Volume 21 • Issue 11 • November 2021
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© 2021 American Society of Civil Engineers.
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Received: Jun 16, 2020
Accepted: May 17, 2021
Published online: Aug 26, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 26, 2022
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