Preparation and Properties of Sodium Silicate-Na2CO3 Activated Magnesium-Rich Nickel Slag-Fly Ash Based Geopolymer

Abstract

Abstract: In this paper, the effects of the mass ratio of magnesium-rich nickel slag and fly ash, the content of composite alkali activator (sodium silicate-Na₂CO₃) and water binder ratio on the mechanical properties of magnesium-rich nickel slag-fly ash based geopolymer were studied by orthogonal test. The products were characterized by XRD, SEM, EDS and TG. The results show that the 28 d compressive strength of the optimal sample reaches 37.50 MPa. XRD results shows that calcium silicate gel form in the products of 7 d and 28 d. SEM and EDS analysis show that there are chabazite (N-A-S-H) and sodium magnesium aluminum silicate gel (N-M-A-S) amorphous gel phases in the products. These gel phases are the main reasons for the increase of the strength of geopolymer.

Key words: alkali activated geopolymer, composite alkali activator, magnesium-rich nickel slag, fly ash, mechanical property

CLC Number:

TQ172.4⁺4

LIU Yun, FENG Chunfu, LIU Yang, YANG Shengwei, WANG Mitang. Preparation and Properties of Sodium Silicate-Na₂CO₃ Activated Magnesium-Rich Nickel Slag-Fly Ash Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 582-588.

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Preparation and Properties of Sodium Silicate-Na₂CO₃ Activated Magnesium-Rich Nickel Slag-Fly Ash Based Geopolymer

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