Utilization of red mud for producing a high strength binder by composition optimization and nano strengthening

被引:29
|
作者
Ahmed, Sara [1 ]
Meng, Tao [1 ]
Taha, Mazahir [2 ]
机构
[1] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China
[2] Northeast Forestry Univ, Sch Civil Engn, Harbin 150040, Peoples R China
关键词
red mud binder; composition optimization; nano strengthening; compressive strength; nano silica; ASH-BASED GEOPOLYMER; COMPRESSIVE STRENGTH; BAUXITE RESIDUE; SODIUM-SILICATE; GLASS-CERAMICS; BAYER-PROCESS; METAKAOLIN; NANO-SIO2; WASTE; PARAMETERS;
D O I
10.1515/ntrev-2020-0029
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:396 / 409
页数:14
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