Preparation and Performance Characterization of Magnesium-Rich Nickel Slag-Fly Ash-Based Geopolymer

Abstract

Abstract: A series of magnesium-rich nickel slag-fly ash-based geopolymers were prepared from industrial solid waste magnesium-rich nickel slag and fly ash with sodium silicate and NaOH as alkali activators. The effect of different fly ash content on the mechanical properties of geopolymers was studied, and the linear shrinkage and alkali dissolution of geopolymers were measured. The geopolymers were characterized by XRD, IR, DTA, etc. Results show that the strength of the magnesium-rich nickel slag-fly ash-based geopolymer increases first and then decreases with the increase of fly ash content. When the content of fly ash is 30% (mass fraction), the compressive strength of the geopolymer reaches the maximum strength with 22.15 MPa, which is 42.2% higher than that of nickel slag-based geopolymer. XRD result shows that the state of MgO in magnesium-rich nickel slag is forsterite phase, instead of free state, which ensures the good volume stability of geopolymer.

Key words: magnesium-rich nickel slag, alkali excitation, volume stability, mechanical property, geopolymer

CLC Number:

TQ172.4⁺4

LIU Yang, WU Jinxiu, FENG Chunfu, YANG Shengwei, FENG Fushan, WANG Mitang. Preparation and Performance Characterization of Magnesium-Rich Nickel Slag-Fly Ash-Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 921-928.

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