NaCl Activation of Steel Slag upon Component Adjustment

  • Li Liu
  • Qianwen Liu
  • Yongfeng Deng
  • Yu Zhao
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)


The re-utilization of steel slag, a kind of by-products, is relatively rough in China for lack of activity. The adjustment concept of the cement clinker was introduced by adding metakaolin and lime to imitate the suitable cement components. Hereafter the formed composites were activated by NaCl to enhance the strength. The results showed that the strength of the composite slag-based materials arrived at 4.5 MPa after adjustment, furthermore, the maximum strength after NaCl activation is 8.2 MPa, showing great improvement. XRD and SEM results revealed that after adjustment and activation, calcium silicoaluminate hydrate (C3ASH), calcium silicate hydrate (C-S-H) and calcium ferrite hydrate were generated for the composite. Among them, the new hydrate of Friedel’s salt (Fs) was found after NaCl activation, which is the main reason for the obvious increment of the cementation and strength.


Steel slag Metakaolin Component adjustment Chemical activation Macro strength Hydration product and microstructure 



This study is supported by the National Natural Science Foundation of China (Grant No. 41572280) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX17-0131).


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Authors and Affiliations

  1. 1.School of TransportationSoutheast UniversityNanjingChina

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