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Hydrothermal solidification of blast furnace slag by formation of tobermorite

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Abstract

Blast furnace water-cooled slag (BFWS) has been solidified using a hydrothermal processing method, in which the BFWS could be solidified in an autoclave under saturated steam pressure (1.56 MPa) at 200 °C for 12 h by the additions of quartz or coal flyash. The tensile strength development was shown to depend on the formation of tobermorite and the packing state of the formed tobermorite in the solidified bodies. The additions of quartz or fly ash were proved to be favorable not only to the formation of tobermorite but also to the transformation of hibschite, the former improving the strength, and the latter deteriorating the strength. The excessive addition of quartz appeared to cause strength deterioration due to the fact that the residual quartz affected the formation of tobermorite in the solidified bodies.

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Acknowledgements

The work reported hear was partially supported by the Iron and Steel Institute of Japan under Grant of 45310244.

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Authors and Affiliations

  1. Graduate School of Environmental Studies, Tohoku University, Aoba20, Aoba-ku, Sendai, 980-8579, Japan

    Zhenzi Jing, N. Yamasaki & H. Ishida

  2. School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China

    F. Jin

  3. Fracture and Reliability Research Institute, Tohoku University, Aoba20, Aoba-ku, Sendai, 980-8579, Japan

    T. Hashida

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  1. Zhenzi Jing
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  2. F. Jin
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  3. T. Hashida
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  4. N. Yamasaki
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  5. H. Ishida
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Correspondence to Zhenzi Jing.

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Jing, Z., Jin, F., Hashida, T. et al. Hydrothermal solidification of blast furnace slag by formation of tobermorite. J Mater Sci 42, 8236–8241 (2007). https://doi.org/10.1007/s10853-007-1726-3

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  • DOI: https://doi.org/10.1007/s10853-007-1726-3

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