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Open AccessArticle

Soil Recycling Geopolymers Fabricated from High Power Ultrasound Treated Soil Slurry in the Presence of Ammonia

1
Department of Energy and Environment, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan
2
Department of Science and Technological Innovation, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3804; https://doi.org/10.3390/ma12223804
Received: 15 September 2019 / Revised: 9 November 2019 / Accepted: 12 November 2019 / Published: 19 November 2019
Soil slurry was recycled to prepare a geopolymer after treatment with high-power ultrasound (US) in the presence of NH3, HCl, and NaOH. Under 28 kHz US, 0.1 M NH3 additives effectively decarbonized the slurry, eliminating 72.2% of the carbon content from the original soil. The US-treated soils were used as raw materials for the geopolymer, as they contained Si and Al components in the range of 25–30 and 8–10 wt.%, respectively. The geopolymer was prepared with a Na2SiO4/NaOH aqueous solution at a ¼ weight ratio at 80 °C for 24 h. The resultant geopolymers from the NH3-treated soil showed the best compressive strength of 3 MPa after 1 day of curing, with a low carbon content, when NH3 was used as an additive as opposed to HCl and NaOH under 1200 US exposure. View Full-Text
Keywords: organic carbon; soil reuse; soil treatment; high-power ultrasound; geopolymer; soil washing organic carbon; soil reuse; soil treatment; high-power ultrasound; geopolymer; soil washing
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MDPI and ACS Style

Kwedi-Nsah, L.-M.; Watanabe, Y.; Kobayashi, T. Soil Recycling Geopolymers Fabricated from High Power Ultrasound Treated Soil Slurry in the Presence of Ammonia. Materials 2019, 12, 3804.

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