The mechanism of pristine steel slag for boosted performance of fly ash-based geopolymers

Ma, Fei; Zhou, Lianzhu; Luo, Yang; Wang, Jiaqing; Ma, Bing; Qian, Binbin; Zang, Jun; Hu, Yueyang; Ren, Xiaofeng

doi:10.1016/j.jics.2022.100602

Cited by 11 publications

(2 citation statements)

References 40 publications

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“…The reaction rate of SS was lower than that of slag. The f-CaO in SS leads to expansion that may produce small pores [ 34 ], resulting in a lower compressive strength. The compressive strength of SS1 was lower than that of GS1 but higher than that of FA1.…”

Section: Resultsmentioning

confidence: 99%

Effect of Steel Slag on the Properties of Alkali-Activated Slag Material: A Comparative Study with Fly Ash

Han,

Zhu,

Zhang

et al. 2024

Materials

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Slag and fly ash (FA) are mostly used as precursors for the production of alkali-activated materials (AAMs). FA is the waste discharged by power plants, while slag and steel slag (SS) both belong to the iron and steel industry. The effects of SS and FA on the strength, microstructure, and volume stability of alkali-activated slag (AAS) materials with different water glass modulus (Ms) values were comparatively investigated. The results show that adding SS or FA decreases the compressive strength of AAS mortar, and the reduction effect of SS is more obvious at high Ms. SS or FA reduce the non-evaporable water content (Wn) of AAS paste. However, SS increases the long-term Wn of AAS paste at low Ms. The cumulative pore volume and porosity increase after adding SS or FA, especially after adding FA. The hydration products are mainly reticular C-(A)-S-H gels. Adding SS increases the Ca/Si ratio of C-(A)-S-H gel but decreases the Al/Si ratio. However, by mixing FA, the Ca/Si ratio is reduced and the Al/Si ratio is almost unchanged. The incorporation of SS or FA reduces the drying shrinkage of AAS mortar, especially when SS is added. Increasing Ms increases the compressive strength and improves the pore structure, and it significantly increases the drying shrinkage of all samples. This study provides theoretical guidance for the application of steel slag in the alkali-activated slag material.

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Section: Resultsmentioning

confidence: 99%

Effect of Steel Slag on the Properties of Alkali-Activated Slag Material: A Comparative Study with Fly Ash

Han,

Zhu,

Zhang

et al. 2024

Materials

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“…Traditional building materials such as ordinary Portland cement (OPC) are potentially harmful to energy consumption and the environment, and this has stimulated the sustainable development of the construction industry [1,2]. The development of sustainable and low-energy geopolymer technology for the reutilization of industrial wastes or by-products has attracted increasing attention in today's resource-constrained and critical environment [3][4][5][6][7][8][9][10][11][12][13][14]. Geopolymers fabricated in an alkaline solution and aluminosilicate materials fabricated by dissolution, reorientation, polycondensation, and polymerization reactions possess three-dimensional silico-aluminate frameworks where all the shared oxygen atoms are linked with SiO 4 and AlO 4 tetrahedra [15,16].…”

Section: Introductionmentioning

confidence: 99%

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

Zang,

Yao,

et al. 2024

Buildings

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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.

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Cleaner geopolymer prepared by co-activation of gasification coal fly ash and steel slag: durability properties and economic assessment

Chen

Peng

Zhou

et al. 2023

Front. Environ. Sci. Eng.

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The mechanism of pristine steel slag for boosted performance of fly ash-based geopolymers

Cited by 11 publications

References 40 publications

Effect of Steel Slag on the Properties of Alkali-Activated Slag Material: A Comparative Study with Fly Ash

Effect of Steel Slag on the Properties of Alkali-Activated Slag Material: A Comparative Study with Fly Ash

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

Cleaner geopolymer prepared by co-activation of gasification coal fly ash and steel slag: durability properties and economic assessment

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