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Article

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

1
Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
2
Division of Field Engineering for the Environment, Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
3
Nippon Steel Corporation, Marunouchi 2-6-1, Chiyoda-ku, Tokyo 100-8071, Japan
4
Advanced Technology Research Laboratories, Nippon Steel Corporation, 20-1 Shintomi, Futtsu-shi, Chiba 293-8511, Japan
5
Nippon Steel Eco-Tech Corporation, Kyobashi 1-18-1, Chuo-ku, Tokyo 104-0031, Japan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(23), 5450; https://doi.org/10.3390/ma13235450
Received: 4 November 2020 / Revised: 22 November 2020 / Accepted: 24 November 2020 / Published: 30 November 2020
(This article belongs to the Collection Alkali‐Activated Materials for Sustainable Construction)
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. View Full-Text
Keywords: steel slag; dredged soil; soil organic matters; strength inhibition; pozzolanic reaction steel slag; dredged soil; soil organic matters; strength inhibition; pozzolanic reaction
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MDPI and ACS Style

Toda, K.; Kikuchi, R.; Otake, T.; Nishimura, S.; Akashi, Y.; Aimoto, M.; Kokado, T.; Sato, T. Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag. Materials 2020, 13, 5450. https://doi.org/10.3390/ma13235450

AMA Style

Toda K, Kikuchi R, Otake T, Nishimura S, Akashi Y, Aimoto M, Kokado T, Sato T. Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag. Materials. 2020; 13(23):5450. https://doi.org/10.3390/ma13235450

Chicago/Turabian Style

Toda, Kanako, Ryosuke Kikuchi, Tsubasa Otake, Satoshi Nishimura, Yuzoh Akashi, Michihiro Aimoto, Takeshi Kokado, and Tsutomu Sato. 2020. "Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag" Materials 13, no. 23: 5450. https://doi.org/10.3390/ma13235450

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