Microstructure and Properties of TiO2 Modified Coal Gasification Coarse Slag Based Geopolymer

Abstract

Abstract: Coal gasification slags can be divided into coarse slag and fine slag, which has potential application in alkali-activation field. The physical and chemical properties of coal gasification coarse slag were studied, and the geopolymer was prepared by using coal gasification coarse slag, meanwhile geopolymer modified by TiO₂ was studied. The results show that the mechanical properties of coal gasification coarse slag based geopolymer significantly improve by adding a certain amount of TiO₂. When 10.0% (mass fraction) TiO₂ is added, the 28 d compressive strength of the sample increases from 23.4 MPa to 42.9 MPa. In addition, through phase and microstructure analysis of the samples, the addition of TiO₂ significantly improves the microstructure of the geopolymer, promotes the alkali-activation reaction, and improves the mechanical properties of the material.

Key words: coal gasification coarse slag, alkali-activation, geopolymer, mechanical property, TiO₂, modification, microstructure

CLC Number:

TU52

ZHANG Tong, LIU Ze, SU Zhuangfei, ZHU Siyu. Microstructure and Properties of TiO₂ Modified Coal Gasification Coarse Slag Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 520-525.

References

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Microstructure and Properties of TiO₂ Modified Coal Gasification Coarse Slag Based Geopolymer

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