Although amounts of steel slag are left as waste, advances in treatment technologies have made steel slag a potential low-carbon supplementary cementitious material. Replacing cement with steel slag will drastically reduce carbon footprint, especially, in the engineering field where there are efforts to improve the geological properties of soft soil using cement-based cementitious materials. However, the influence of the degree of fineness, precarbonation treatment, and substitution ratio of steel slag on the mechanical properties of stabilized soils with a cement-steel slag blend and the corresponding influence mechanism are still unclear. Herein, four types of steel slag powders (i.e., coarse steel slag (CSS), fine steel slag (FSS), fine steel slag under precarbonation treatment for 2 h (FSS-C-2h), and fine steel slag under precarbonation treatment for 18 h (FSS-C-18h)) were prepared in a laboratory and used as a substitute to cement at ratios of 10%, 20%, 30%, and 50%. Tests were conducted to evaluate the strength and performance of the cement—steel slag blend stabilized soils (SCSs), and the changes in the phase and morphology of the hydration products were observed. The results showed that the SCS with 10% FSS-C-18h had the highest unconfined compressive strength after curing for 60 d at 110% of stabilized soil with pure cement. The SCSs with CSS and FSS showed no expansion failure during the continuous boiling test over 60 d. The main hydration products for the SCSs were C—S—H and ettringite. Concerning long-term strength and stability, FSS-C-18h at a substitution ratio of 10% or 20% is recommended for achieving green and low-carbon stabilized soils.


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    Title :

    Steel Slag/Precarbonated Steel Slag as a Partial Substitute for Portland Cement: Effect on the Mechanical Properties and Microstructure of Stabilized Soils


    Additional title:

    KSCE J Civ Eng


    Contributors:
    Cui, Chunyi (author) / Yu, Chunyang (author) / Zhao, Jiuye (author) / Zheng, Junjie (author)

    Published in:

    Publication date :

    2022-09-01


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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