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- Title
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
- 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/cm3 to 1.13 g/cm3. 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.
- Subjects
SLAG; CALCIUM silicate hydrate; FLY ash; STEEL; INORGANIC polymers; X-ray spectroscopy; COMPRESSIVE strength
- Publication
Buildings (2075-5309), 2024, Vol 14, Issue 2, p463
- ISSN
2075-5309
- Publication type
Article
- DOI
10.3390/buildings14020463