Hydration properties of steel slag under autoclaved condition

Wang, Qiang; Mengxiao, Shi; Zhang, Zengqi

doi:10.1007/s10973-015-4397-3

Cited by 40 publications

(8 citation statements)

References 26 publications

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“…While this expansion value does not necessarily correlate well to field performance or free CaO content, it is a very rapid test method that can be used as an index test. In addition, autoclaving conditions can be used to study the hydration reactions in SFS [302,303].…”

mentioning

confidence: 99%

A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites

Brand

Fanijo

2020

Applied Sciences

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The type of steel furnace slag (SFS), including electric arc furnace (EAF) slag, basic oxygen furnace (BOF) slag, ladle metallurgy furnace (LMF) slag, and argon oxygen decarburization (AOD) slag, can significantly affect the composite properties when used as an aggregate or as a supplementary cementitious material in bound applications, such as concretes, mortars, alkali-activated materials, and stabilized soils. This review seeks to collate the findings from the literature to express the variability in material properties and to attempt to explain the source(s) of the variability. It was found that SFS composition and properties can be highly variable, including different compositions on the exterior and interior of a given SFS particle, which can affect bonding conditions and be one source of variability on composite properties. A suite of tests is proposed to better assess a given SFS stock for potential use in bound applications; at a minimum, the SFS should be evaluated for free CaO content, expansion potential, mineralogical composition, cementitious composite mechanical properties, and chemical composition with secondary tests, including cementitious composite durability properties, microstructural characterization, and free MgO content.

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confidence: 99%

A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites

Brand

Fanijo

2020

Applied Sciences

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“…Using fine steel slag powder as cement admixture and concrete admixture [ 4 , 5 ] is the main high added value resource utilization method for steel slag, but the promotion and application of steel slag powder is restricted due to its low hydration activity [ 3 , 6 ]. The conventional techniques used to improve the hydration activity of steel slag powder include carbonization treatment [ 7 , 8 ], high-temperature reconstruction [ 9 , 10 ], mechanical activation [ 11 , 12 ], high-temperature hydrothermal curing [ 13 , 14 ], and chemical activation [ 15 , 16 ]. Although these methods can improve the activity of steel slag powder to a certain extent, its activity is still too low to be accepted by the market.…”

Section: Introductionmentioning

confidence: 99%

Selective Leaching of Inert Mineral Product and the RO Phase in Steel Slag with Acetum to Improve Total Fe Content

et al. 2022

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The chemical and mineral components of the leaching residues obtained during the leaching of inert mineral product (IMP) and two samples of divalent metal oxide continuous solid solution (RO phase) by acetum at 20 °C were analyzed to reveal the selective leaching characteristics of the chemical and mineral components in steel slag, and clarify the leaching rates and differences of MgO and FeO in the RO phase. The results indicated that the content of total Fe (TFe) in the leaching residue increased, whereas the contents of CaO, SiO2, and MgO decreased during the leaching of the inert mineral product by acetum. Fe3O4 was insoluble in acetum. The leaching rates of the RO phase and metallic Fe were very low, while those of calcium silicate (C2S + C3S) and dicalcium ferrite (C2F) were quite high. MgO and FeO in the RO phase continuously leached over time, and the leaching rate of MgO reached 1.9 times that of FeO. Therefore, during the leaching of the RO phase by acetum, the FeO content increased, whereas the MgO content decreased. In conclusion, acetum leaching can effectively improve the TFe content of the RO phase and the inert mineral product.

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“…Using steel slag as a cementing material and fine aggregate in concrete is feasible. Steel slag powder contains f-CaO, active RO phase and other components, which will produce volume expansion in the process of a hydration reaction [ 9 , 16 , 17 , 18 ], thus compensating the shrinkage of concrete and reducing or even replacing the use of an expansion agent in concrete [ 19 ]. Besides, steel slag sand has weak activity, and the interfacial reaction may occur in the alkaline environment, which may improve the interfacial connection properties.…”

Section: Introductionmentioning

confidence: 99%

Hydration and Microstructure of Steel Slag as Cementitious Material and Fine Aggregate in Mortar

Jiang

Ding

et al. 2020

Molecules

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Due to the low hydration activity and poor volume stability, extensive steel slag utilization is restricted. In this paper, the hydration process and microstructure of alkali-activated materials with steel slag as a cementitious material and fine aggregate were studied. The phase composition and micro-morphology of hydration products were measured using XRD, NMR and SEM. The response relationship between microstructure and mechanical properties during hydration was revealed. The results show that the main hydration products of the alkali-activated steel slag powder-granulated blast furnace slag powder cementitious system are Ca(OH)2 and calcium aluminosilicate hydrate (C-A-S-H) gel. With the progress of hydration, the amount of calcium silicate hydrate (C-S-H) gel and the average molecular chain length increase, Al[4]/Si decreases, while C/S increases first and then decreases, and the structure of cement paste becomes much more compact. The interface between steel slag sand and cement paste is denser than that of river sand, since the hydration occurs on the surface of steel slag sand, which leads to the formation of C-A-S-H gel and Ca(OH)2. As a result, the compressive strength of concrete prepared by steel slag sand is higher than that of river sand with the same mix proportion.

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Hydration properties of steel slag under autoclaved condition

Cited by 40 publications

References 26 publications

A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites

A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites

Selective Leaching of Inert Mineral Product and the RO Phase in Steel Slag with Acetum to Improve Total Fe Content

Hydration and Microstructure of Steel Slag as Cementitious Material and Fine Aggregate in Mortar

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