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The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers.

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers.

Authors :
Zang, Jun
Yao, Chunlei
Ma, Bing
Shao, Zhiyuan
Zhang, Houhu
Wang, Jiaqing
Qian, Binbin
Zhou, Hao
Hu, Yueyang
Source :
Buildings (2075-5309); Feb2024, Vol. 14 Issue 2, p463, 17p
Publication Year :
2024

Abstract

Steel slag is an industrial by-product of the steelmaking process, which is under-utilized and of low value due to its characteristics. Alkali-activated technology offers the possibility of high utilization and increased value of steel slag. A geopolymer composition was composed of steel slag, fly ash, and calcium hydroxide. Four experimental groups utilizing steel slag to substitute fly ash are established based on varying replacement levels: 35%, 40%, 45%, and 50% by mass. The final samples were characterized by compressive strength tests, and Fourier-transform infrared spectroscopy measurements, thermogravimetric measurements, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, and mercury intrusion porosimetry were used to investigate the chemical composition and microstructure of the final products. Higher steel slag/fly ash ratios lead to a lower bulk density and lower compressive strength. The compressive strength ranges from 3.7 MPa to 5.6 MPa, and the bulk density ranges from 0.85 g/cm<superscript>3</superscript> to 1.13 g/cm<superscript>3</superscript>. Microstructural and energy-dispersive X-ray spectroscopy analyses show that the final geopolymer products were a type of composite consisting of both calcium aluminate silicate hydrate and sodium aluminate silicate hydrate, with the unreacted crystalline phases acting as fillers. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20755309
Volume :
14
Issue :
2
Database :
Complementary Index
Journal :
Buildings (2075-5309)
Publication Type :
Academic Journal
Accession number :
175652827
Full Text :
https://doi.org/10.3390/buildings14020463