NaCl Activation of Steel Slag upon Component Adjustment
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.
KeywordsSteel 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).
- 1.Hou, G.H., Li, W., Guo, W.: Microstructure and mineral phase of converter slag. J. Chin. Ceram. Soc. 36(4), 436–443 (2008)Google Scholar
- 2.Wang, Q., Bao, L., Yan, P.: Research progress on converter steel slag applied for concrete. Concrete 02, 53–56 (2009)Google Scholar
- 3.Huang, Y., Xu, G., Cheng, H., et al.: Analysis on chemical composition, cicro-morphology and phase of typical steel slag. Bull. Chin. Ceram. Soc. 08, 1902–1907 (2014)Google Scholar
- 4.Dong, Q., Li, C., Peng, B., et al.: Study of the practicability of asphalt concrete confected by steel slag. J. Wuhan Univ. Technol. 23(6), 9–13 (2001)Google Scholar
- 5.Zhao, H., Yu, Q., Wei, J., et al.: Effect of composition and temperature on structure and early hydration activity of modified steel slag. J. Build. Mater. 03, 399–405 (2012)Google Scholar