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Study on the Early Effect of Excitation Method on the Alkaline Steel Slag

Author

Listed:
  • Maohui Li

    (School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China)

  • Youjun Lu

    (School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China)

  • Shaolin Yang

    (School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China)

  • Jingjun Chu

    (Ningxia Saima Kejin Concrete Co., Ltd., Yinchuan 750001, China)

  • Yajuan Liu

    (Ningxia Saima Kejin Concrete Co., Ltd., Yinchuan 750001, China)

Abstract

The change law of alkaline steel slag cementitious activity was investigated by mechanical excitation, alkaline excitation, and salt excitation methods. The effect of grinding time, chemical activators, and content of steel slag on the properties of cement replaced by steel slag was studied. The hydration products of cement replaced by steel slag were analyzed by XRD and SEM. The results show mechanical excitation can effectively improve the particle size distribution and cementitious activity of steel slag. The best mechanical properties are obtained when grinding for 20 min and adding 10% steel slag. Chemical excitation can further improve the cementitious activity of steel slag based on mechanical stimulation. The optimal mechanical properties are obtained when the dosage of sodium hydroxide is 1.0%, the dosage of early strength agent is 2.0%, and the dosage of steel slag is 25%. The main hydration products of cement replaced by steel slag are calcite (CaCO 3 ), calcium hydroxide (Ca(OH) 2 ), dicalcium silicate (Ca 2 SiO 4 ), and C-S-H gel. The microstructure presents a fibrous network structure, laying the foundation for improving mechanical properties.

Suggested Citation

  • Maohui Li & Youjun Lu & Shaolin Yang & Jingjun Chu & Yajuan Liu, 2023. "Study on the Early Effect of Excitation Method on the Alkaline Steel Slag," Sustainability, MDPI, vol. 15(6), pages 1-11, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:4714-:d:1089823
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    References listed on IDEAS

    as
    1. Yuanhang Sun & Meizhu Chen & Dongyu Chen & Shaoyan Liu & Xintao Zhang & Shaopeng Wu, 2022. "Laboratory Preparation and Performance Characterization of Steel Slag Ultrafine Powder Used in Cement-Based Materials," Sustainability, MDPI, vol. 14(22), pages 1-18, November.
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    Cited by:

    1. Maohui Li & Youjun Lu & Yajuan Liu & Jingjun Chu & Tongsheng Zhang & Wei Wang, 2024. "Influence of the Steel Slag Particle Size on the Mechanical Properties and Microstructure of Concrete," Sustainability, MDPI, vol. 16(5), pages 1-12, March.

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