Recycling of red mud (RM) has attracted more attention in recent years due to severe environmental problems caused by landfilling. The effect of composition optimization and Nano-strengthening on the properties of a binder based on RM was studied in this paper. Results showed that modifying ratios of main oxides and adding Nano-SiO2 could obviously affect the mechanical properties and microstructure of the binder. Specimens with high SiO2/Al2O3 molar ratio (S/A) displayed considerable increase in compressive strength, while decreasing Na2O/Al2O3 molar ratio (N/A) improved the workability of the fresh mix. The compressive strength was developed significantly to be 45 MPa at 28 days by adding Nano-SiO2 with 0.4 wt.% of RM. Phase transformation and microstructure change at different stages of RM decomposition and binder geopolyerization were investigated by X-ray diffraction (XRD), Fourier transformation infrared (FTIR) and Scanning electron microscopy (SEM). The results of this study may provide a prospective method to use RM more widely in construction applications.
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Liu, Taoyong
Zhang, Jiashuo
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Zhang, Jiashuo
Wu, Jiaqi
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Wu, Jiaqi
Liu, Jianlei
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Liu, Jianlei
Li, Cui
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Li, Cui
Ning, Tanxiang
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Ning, Tanxiang
Luo, Zhiwei
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Luo, Zhiwei
Zhou, Xin
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Hunan Bossco Environm Protect Co Ltd, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Zhou, Xin
Yang, Qifeng
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Hunan Bossco Environm Protect Co Ltd, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
Yang, Qifeng
Lu, Anxian
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Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
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Northeastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
State Key Lab Mineral Proc, Beijing 100070, Peoples R China
Natl Local Joint Engn Res Ctr High Efficient Expl, Shenyang 110819, Peoples R ChinaNortheastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Liu, Xiao
Gao, Peng
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Northeastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Natl Local Joint Engn Res Ctr High Efficient Expl, Shenyang 110819, Peoples R ChinaNortheastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Gao, Peng
Yuan, Shuai
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Northeastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
State Key Lab Mineral Proc, Beijing 100070, Peoples R China
Natl Local Joint Engn Res Ctr High Efficient Expl, Shenyang 110819, Peoples R ChinaNortheastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Yuan, Shuai
Lv, Yang
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Northeastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Natl Local Joint Engn Res Ctr High Efficient Expl, Shenyang 110819, Peoples R ChinaNortheastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Lv, Yang
Han, Yuexin
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Northeastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
Natl Local Joint Engn Res Ctr High Efficient Expl, Shenyang 110819, Peoples R ChinaNortheastern Univ, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China