Effect of Activator on Rheological and Mechanical Properties of One-Part Lithium Slag-Based Geopolymer

doi:10.16552/j.cnki.issn1001-1625.2024.1602

Abstract

Abstract: The preparation of lithium slag-based geopolymer is an efficient and low-carbon method for the utilization of lithium slag. Considering the significant influence of activator dosage on the performance of geopolymer, this study investigated the effect of activator dosage on the fluidity, setting time, rheological properties, and compressive strength of lithium slag-based geopolymer. The hydration process and microstructure of the lithium slag-based geopolymer were characterized through heat of reaction tests, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results indicate that increasing the activator dosage significantly reduces the workability of the geopolymer. Both the yield stress and plastic viscosity of the lithium slag-based geopolymer increase with increasing activator dosage. When the activator dosage is 3% (mass fraction), the 28 d compressive strength of the lithium slag-based geopolymer reaches a maximum of 35.9 MPa. An appropriate amount of activator promotes the polymerization reaction, generating more hydrated calcium (sodium) aluminosilicate (C(N)-A-S-H) composite gel, which effectively fills the pores and results in a denser geopolymer structure.

Key words: lithium slag, geopolymer, workability, rheological property, mechanical property, microstructure

CLC Number:

X705

ZHANG Zongyang, SHAMA Shibu, LUO Qi, LU Liulei, YE Weikai, SHENG Guodong, ZHANG Feng, DONG Faxin, LIU Mingwang, WANG Junfeng. Effect of Activator on Rheological and Mechanical Properties of One-Part Lithium Slag-Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2538-2548.

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