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Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag

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Title: Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag
Authors: Toda, Kanako Browse this author
Kikuchi, Ryosuke Browse this author →KAKEN DB
Otake, Tsubasa Browse this author →KAKEN DB
Nishimura, Satoshi Browse this author →KAKEN DB
Akashi, Yuzoh Browse this author
Aimoto, Michihiro Browse this author
Kokado, Takeshi Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Keywords: steel slag
dredged soil
soil organic matters
strength inhibition
pozzolanic reaction
Issue Date: 30-Nov-2020
Publisher: MDPI
Journal Title: Materials
Volume: 13
Issue: 23
Start Page: 5450
Publisher DOI: 10.3390/ma13235450
Abstract: Dredged soils have been used as construction materials by alkaline activation with steel slag (steel slag-dredged soil mixtures) at harbors. Such mixtures develop strength chiefly by calcium silicate hydrate (C-S-H) formation by the pozzolanic reaction. However, the strength of such mixtures is unpredictable, and in some cases, mixtures have been too soft for the intended engineering application. An identification of strength development indicators would accelerate evaluation processes for strength development to facilitate and promote the utilization of such materials. This paper focuses on the relationship between the characteristics of soil organic matters in dredged soils and the strength development of the mixtures by a comparison of eight dredged soils collected from eight different Japanese harbors. The characteristics of the soil organic matters were identified to determine as indicators of mixtures with weak strength development, i.e., enriched sulfur content in extracted soil organic matter (humic acid) fraction, and the N/C ratio of humic acid similar to land humic acid standards. Increases in the validated fraction of dredged soils and steel slag by replacing fractions disadvantageous to construction resources would contribute to reduce waste production, which would lower the environmental impact of the use, aiming to achieve sustainable utilization of such materials.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 努

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