日本地球惑星科学連合2015年大会

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セッション記号 B (地球生命科学) » B-CG 地球生命科学複合領域・一般

[B-CG28] 生命-水-鉱物-大気相互作用

2015年5月26日(火) 18:15 〜 19:30 コンベンションホール (2F)

コンビーナ:*白石 史人(広島大学大学院理学研究科地球惑星システム学専攻)、大竹 翼(北海道大学大学院工学研究院 環境循環システム部門)、鈴木 庸平(東京大学大学院理学系研究科)、高井 研(海洋研究開発機構極限環境生物圏研究センター)、上野 雄一郎(東京工業大学大学院地球惑星科学専攻)、長沼 毅(広島大学大学院生物圏科学研究科)、掛川 武(東北大学大学院理学研究科地学専攻)、横山 正(大阪大学大学院理学研究科宇宙地球科学専攻)、中村 謙太郎(独立行政法人海洋研究開発機構 (JAMSTEC) システム地球ラボ プレカンブリアンエコシステムラボユニット)

18:15 〜 19:30

[BCG28-P01] 道路用路盤材に用いる鉄鋼スラグの水和反応と硬化作用

*新井 悠1大竹 翼2佐藤 努2 (1.北海道大学 大学院 工学院、2.北海道大学 大学院 工学研究院 資源循環システム部門)

キーワード:スラグ, 水和

Steel slag is a by-product of the steel manufacturing process and produced in large quantities every year. Steel slag is expected to reuse in Japan. However, it was observed that the uniaxial compressive strength (UCS) differs among mixed slag for roadbed materials produced from different factories including even with the same mixing ratio of DCS and GBFS. In particular, the difference between the UCS of slag produced from K ironworks and N ironworks was remarkable. The reason for these differences has not yet been clarified. To extend the market of steel slag, it is essential to clarify the relationship between secondary minerals formed after hydration and the UCS of the slag.
This study firstly investigated the UCS of the MIX slag ( DCS / GBFS = 4 ) from K ironworks and N ironworks. Based on the UCS tests, the slag from N ironworks is stronger than the slag from K ironworks.
Batch experiments were then conducted for samples from K ironworks and N ironworks to investigate and compare the evolution of solution chemistry and precipitation of secondary minerals during slag hydration. Based on the XRD analysis for the samples after the batch experiments, the main product of the MIX sample from K ironworks is αC2SH while the MIX sample from N ironworks produced mainly CSH. The difference in mineralogy could be related to the UCS of the slag because of the difference in volume of secondary minerals. Based on the solution analysis of the samples, it is observed that the main source of Ca ion is DCS, while the main source of Si ion is GBFS. In addition, it is possible that the concentration of H4SiO4 in the solution, which is present in the form of calcium silicate hydrates, is determined by GBFS. Kinetic model was constructed. The model represent the mineral evolution during slag hydration in the both MIX slags.