Preparation of Rice Husk Ash and Its Effect on Mechanical Properties of Geopolymer

Abstract

Abstract: Using rice husk (RH) as raw material, the differences of properties and structures of rice husk ash (RHA) prepared under different treatment conditions and the effects on the mechanical properties of metakaolin-based geopolymer were studied. The optimum preparation conditions of RHA were determined. The results show that hydrochloric acid pretreatment significantly improves the purity of amorphous SiO₂ in RHA as high as 98.354% (mass fraction). The RH pretreated by acid is calcined completely by calcining 60 min at 550 ℃ and the reaction activity of RHA is the highest. RHA treated by acid makes the pore structure of geopolymers denser and the 28 d compressive strength of 550 ℃ RHA geopolymer (10% (mass fraction) RHA+90% (mass fraction) metakaolin) is the highest, which is 53.3 MPa. Through comprehensive impact analysis, the optimum preparation conditions of RHA are as follows: immersed in 2.5% (mass fraction) hydrochloric acid for 1 h and calcined at 550 ℃ for 1 h.

Key words: rice husk ash, acid treatment, calcination temperature, geopolymer, mechanical property

CLC Number:

TB332

LIU Zhenzheng, XIE Chunlei, WANG Xueying, GUO Liang, WU Yueyue, CHEN Qin, DUAN Ping. Preparation of Rice Husk Ash and Its Effect on Mechanical Properties of Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3881-3888.

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