Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites
The use of electric furnace ferronickel slag (FNS) as a supplementary cementitious material is the current focus of research. This study investigates the effect of mechanical grinding and chemical additives on the activity excition of FNS, as well as the associated synergistic mechanisms. This study...
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2024-03-01
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| author | Yanjun Jiang Xuqin Duan Bohua Li Shuaiyu Lu Tong Liu Yunyun Li |
| author_facet | Yanjun Jiang Xuqin Duan Bohua Li Shuaiyu Lu Tong Liu Yunyun Li |
| author_sort | Yanjun Jiang |
| collection | DOAJ |
| description | The use of electric furnace ferronickel slag (FNS) as a supplementary cementitious material is the current focus of research. This study investigates the effect of mechanical grinding and chemical additives on the activity excition of FNS, as well as the associated synergistic mechanisms. This study shows that the addition of triethanolamine (TEA) increases the fine-grained content in FNS powder, which facilitates the depolymerization of FNS and the early hydration of aluminum tricalcium. Furthermore, the addition of Ca(OH)<sub>2</sub> raises the alkalinity of the cementitious system, which promotes the availability of Ca<sup>2+</sup> ions and accelerates the hydration process, resulting in the generation of additional hydration products. The enhancement of late hydration of C<sub>3</sub>S by TEA and its combination with the secondary hydration of Ca<sup>2+</sup> at high alkalinity are the pivotal factors to improve the strength of cementitious composite. A mixture of FNS and 0.03% TEA is subjected to grinding for 90 min, using the obtained micropowder which replaces 20% of the cement, and subsequently, after being excited with 3% Ca(OH)<sub>2</sub>, the FNS micropowder reaches the quality standards of S95 slag powder. It is worth remarking that the micropowder prepared by mixing FNS with 3% Ca(OH)<sub>2</sub> and 0.03% TEA and grinding it for 81 min also meets the S95 standard for slag powder. The larger dosage of FNS in cement is supported by the observed synergy between TEA and Ca(OH)<sub>2</sub>. This research will provide valuable insights for the expanded application of FNS in construction materials. |
| first_indexed | 2024-04-24T18:03:51Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-24T18:03:51Z |
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| series | Materials |
| spelling | doaj.art-64dab026201f4e7da99575909ca13cef2024-03-27T13:52:19ZengMDPI AGMaterials1996-19442024-03-01176124710.3390/ma17061247Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious CompositesYanjun Jiang0Xuqin Duan1Bohua Li2Shuaiyu Lu3Tong Liu4Yunyun Li5School of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaThe use of electric furnace ferronickel slag (FNS) as a supplementary cementitious material is the current focus of research. This study investigates the effect of mechanical grinding and chemical additives on the activity excition of FNS, as well as the associated synergistic mechanisms. This study shows that the addition of triethanolamine (TEA) increases the fine-grained content in FNS powder, which facilitates the depolymerization of FNS and the early hydration of aluminum tricalcium. Furthermore, the addition of Ca(OH)<sub>2</sub> raises the alkalinity of the cementitious system, which promotes the availability of Ca<sup>2+</sup> ions and accelerates the hydration process, resulting in the generation of additional hydration products. The enhancement of late hydration of C<sub>3</sub>S by TEA and its combination with the secondary hydration of Ca<sup>2+</sup> at high alkalinity are the pivotal factors to improve the strength of cementitious composite. A mixture of FNS and 0.03% TEA is subjected to grinding for 90 min, using the obtained micropowder which replaces 20% of the cement, and subsequently, after being excited with 3% Ca(OH)<sub>2</sub>, the FNS micropowder reaches the quality standards of S95 slag powder. It is worth remarking that the micropowder prepared by mixing FNS with 3% Ca(OH)<sub>2</sub> and 0.03% TEA and grinding it for 81 min also meets the S95 standard for slag powder. The larger dosage of FNS in cement is supported by the observed synergy between TEA and Ca(OH)<sub>2</sub>. This research will provide valuable insights for the expanded application of FNS in construction materials.https://www.mdpi.com/1996-1944/17/6/1247electric furnace ferronickel slagsynergistic activationcementitious compositeshydration mechanism |
| spellingShingle | Yanjun Jiang Xuqin Duan Bohua Li Shuaiyu Lu Tong Liu Yunyun Li Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites Materials electric furnace ferronickel slag synergistic activation cementitious composites hydration mechanism |
| title | Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites |
| title_full | Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites |
| title_fullStr | Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites |
| title_full_unstemmed | Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites |
| title_short | Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites |
| title_sort | synergistic activation of electric furnace ferronickel slag by mechanical grinding and chemical activators to prepare cementitious composites |
| topic | electric furnace ferronickel slag synergistic activation cementitious composites hydration mechanism |
| url | https://www.mdpi.com/1996-1944/17/6/1247 |
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