Environmental benefit assessment of steel slag utilization and carbonation: A systematic review

Li, Lufan; Ling, Tung-Chai; Pan, Shu-Yuan

doi:10.1016/j.scitotenv.2021.150280

Cited by 59 publications

(42 citation statements)

References 98 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The low content of these oxides reduces the possibility of expansive hydration reactions. This method provided cementitious mixtures with the incorporation of LFS and expansion volume 10% lower than the samples produced with water cooling [9,10,[15][16][17]. Therefore, slow cooling can benefit LFS both in terms of granulometry (greater fineness) and in terms of reducing expansive chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Influence of the cooling process on the physicochemical properties of ladle furnace slag, used in the replacement of Portland cement

et al. 2022

View full text Add to dashboard Cite

Ladle furnace slag is a waste composed essentially of quicklime or hydrated lime, whose contents depend on the raw material and the cooling process that led to the slag batch. With this chemical composition, it is used by civil construction as a hydraulic binder in cement matrices. The chemical compounds mentioned are also present in Portland cement, which are part of the chemical reactions of hydration and hardening. However, the quality of LFS batches calls for attention to volume expansion caused by chemical compounds whose presence and content can be controlled by the cooling method adopted in the production. Considering the use of this material as a partial replacement for Portland cement, the objective of this study was the physicochemical characterization of LFS samples to evaluate the influence of the cooling method on its potential as a complementary binder in cementitious matrices. In this sense, 3 samples from different batches were analyzed and the effects of each cooling process. The results include analysis of specific mass, laser diffraction for particle size analysis, X-ray fluorescence and X-Ray Diffraction tests. It was verified that the sample obtained by slow cooling is the most suitable as binder, as it features less possibility of expansive chemical reactions and presents greater fineness.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of the cooling process on the physicochemical properties of ladle furnace slag, used in the replacement of Portland cement

et al. 2022

View full text Add to dashboard Cite

show abstract

“…As a by-product of the steel-making process, steel slag, like scrap tires, is also a serious threat to the ecological environment [22,23]. To address the above problems, researchers have achieved good research results using treated steel slag as road engineering materials and have applied these materials in practical engineering, especially in asphalt pavement [24][25][26]. Wu et al [27] replaced 4.75-9.5 mm and 9.5-13 mm aggregates in SMA-13 with steel slag and evaluated the mixture performance.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Asphalt Modified with Steel Slag Powder and Waste Tire Rubber Compounds

et al. 2022

View full text Add to dashboard Cite

As two kinds of solid wastes, waste tires and steel slag have caused serious threats to the environment. Both waste tire rubber (WTR) and steel slag powder (SSP) can improve the performance of asphalt, while the performance indexes and modification mechanism of modified asphalt are not clear. In this paper, asphalt modified with SSP and WTR was prepared, and its performance was evaluated. The physical properties of asphalt modified with SSP and WTR, including penetration, the softening point, and viscosity, were investigated. Furthermore, high-temperature performance, fatigue resistance, low-temperature performance, and blending mechanism of asphalt modified with SSP and WTR were tested with a dynamic shear rheometer (DSR), bending beam rheometer (BBR), and Fourier transform infrared spectrometer (FTIR). The results showed that with the same content of WTR and SSP, WTR reveals a more significant modification effect on physical properties, fatigue, and low-temperature performance of base asphalt than SSP. The anti-rutting performance of SSP-modified asphalt is better than that of WTR-modified asphalt at 30~42 °C, and the anti-rutting performance of WTR-modified asphalt is better than that of SSP-modified asphalt at 42~80 °C. When the total content of WTR and SSP is the same, the physical properties, high-temperature resistance, fatigue resistance, and low-temperature performance of the asphalt modified with WTR and SSP decrease with the decrease in the ratio of WTR and SSP, and their performance is between WTR-modified asphalt and SSP-modified asphalt. Infrared spectrum results verified that the preparation of WTR- and SSP-modified asphalt is mainly a physical blending process. Overall, this research is conducive to promoting the application of modified asphalt with WTR and SSP in the construction of high-standard pavement.

show abstract

“…Steel slag is a kind of industrial solid waste produced in the steel smelting process, and its emissions are about 15~20% of the output of crude steel [ 1 ]. In 2019, China’s crude steel production was 996 million tons [ 2 ], and steel slag production was about 149 million tons, but the utilization rate of steel slag was only 29.5% [ 3 ]. 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 ].…”

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

View full text Add to dashboard Cite

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.

show abstract

Environmental benefit assessment of steel slag utilization and carbonation: A systematic review

Cited by 59 publications

References 98 publications

Influence of the cooling process on the physicochemical properties of ladle furnace slag, used in the replacement of Portland cement

Influence of the cooling process on the physicochemical properties of ladle furnace slag, used in the replacement of Portland cement

Performance Evaluation of Asphalt Modified with Steel Slag Powder and Waste Tire Rubber Compounds

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

Contact Info

Product

Resources

About