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Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures

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Title: Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures
Authors: Toda, Kanako Browse this author
Sato, Haruna Browse this author
Weerakoon, Nilan Browse this author
Otake, Tsubasa Browse this author
Nishimura, Satoshi Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Keywords: steel slag
dredged soil
amorphous silica
cementation
C-S-H
humic acid
geochemical modeling
Issue Date: 24-Apr-2018
Publisher: MDPI
Journal Title: Minerals
Volume: 8
Issue: 5
Start Page: 174
Publisher DOI: 10.3390/min8050174
Abstract: Some of the steel slag from ironworks and dredged soils from marine and waterfront engineering work are partially treated as waste. However, a mixture of these two kinds of waste has the potential to be used as construction materials when mixed, due to chemical reactions forming secondary phases. Utilizing waste of such kind as a resource will help to improve sustainability in society by reducing waste and replacing virgin resources such as cement. Recently, it was reported that mixtures of steel slag and dredged soil hardens under specific conditions. The phase compositions of dredged soils and steel slags vary depending on the quantity of each component, which results in unpredictable strength development of mixtures. The effect of the variations in the components of steel slags and dredged soils on strength development of the mixtures is not yet clear, limiting the utilization of both materials. Understanding the hardening mechanisms of the mixtures will enable the prediction of strength development. Focusing on the variations in the components in steel slags and, especially of dredged soils, this study aims to identify the components in both materials that affect the secondary phase formation that are responsible for strength development. We found support for suggestions that calcium silicate hydrate, C-S-H, is one of the secondary phases responsible for the strength development of the mixtures. From a comparison of two kinds of steel slags and various dredged soils, the amount of portlandite in the steel slags and the amount of amorphous silica in the dredged soils are suggested as a couple of the key components of starting materials involved in the C-S-H formation.
Rights: © 2018 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
http://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/70159
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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