Investigating the performance of dry chemically modified steel slag powder and pastes by formic acid

Huo Binbin; Zhang Yamei; Wang Dongmin; Li Baoliang

doi:10.19606/j.cnki.jmst.2022.05.002

Volume 7 Issue 5

Oct. 2022

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Article Navigation > Journal of Mining Science and Technology > 2022 > 7(5): 522-528

Huo Binbin, Zhang Yamei, Wang Dongmin, Li Baoliang. Investigating the performance of dry chemically modified steel slag powder and pastes by formic acid[J]. Journal of Mining Science and Technology, 2022, 7(5): 522-528. doi: 10.19606/j.cnki.jmst.2022.05.002

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Investigating the performance of dry chemically modified steel slag powder and pastes by formic acid

doi: 10.19606/j.cnki.jmst.2022.05.002

Huo Binbin^{1, 2
,},
Zhang Yamei^{2
,
,},
Wang Dongmin³,
Li Baoliang⁴

1.
School of Mines, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
2.
School of Materials Science and Engineering, Southeast University, Nanjing Jiangsu 211189, China
3.
School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
4.
Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huaian Jiangsu 223001, China

Received Date: 2022-05-04
Rev Recd Date: 2022-05-16
Publish Date: 2022-10-31

Abstract

Abstract

Understanding the composition and reactivity of formic acid modified steel slag powder (SS) from micro scale is critical to extending the utilization of steel slag. In this study, four representative sources of SS were selected, which were dry chemically modified by formic acid (FA) with a mass fraction of 4 % on the basis of SS. The backscatter electron microscope, hydration calorimeter, X-ray diffractometer and fourier transform infrared spectrometer were applied to characterize the SS and SS pastes before and after modification. Results show that the 3 d and 7 d compressive strength of the different sources of SS pastes are low, and the 72 h cumulative hydration heat varies between 10~40 J/g due to their different mineral compositions. However, after FC modification, the 3 d compressive strength increases by more than 200 %, and the 72 h cumulative hydration heat rises to above 50 J/g with an increase above 80 %.it is found that the Ca(OH)₂ in SS can react with FA to produce calcium formate, while the calcium silicates in SS are not significantly affected.
- steel slag powder,
- chemical modification,
- reactivity,
- mechanism

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Investigating the performance of dry chemically modified steel slag powder and pastes by formic acid

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