Use of ladle furnace slag as supplementary cementitious material before and after modification by rapid air cooling: A comparative study of influence on the properties of blended cement paste

Fang, Kuizhen; Zhao, Jihui; Wang, Dongmin; Wang, Huangqi; Dong, Ziliang

doi:10.1016/j.conbuildmat.2021.125434

Cited by 24 publications

(12 citation statements)

References 54 publications

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“…Another factor that affects the properties of the LF slag is the weathering treatment that the slag undergoes upon its removal from the furnace. Weathering treatments such as rapid cooling [21] and long-term cooling in ambient conditions for at least six months are commonly used by steel plants before the slag is disposed of or reused for other applications. [24].…”

Section: Lf Slag Productionmentioning

confidence: 99%

Ladle Furnace Slag: Synthesis, Properties, and Applications

Jacob

2023

ChemBioEng Reviews

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Ladle slag is a byproduct formed during the ladle refining stage of steel making. It is a dusty material that has been considered industrial waste. Technical advancements towards a sustainable industry led to the development of different applications for ladle slag. Depending on the processing methods during the steel slag production and the weathering of the slag post‐production, the elemental composition of the steel slag largely varies. Owing to this, its characteristics cannot be generalized and specific applications depending on the sources are developed. It is generally used in construction materials, soil rejuvenation, and CO2 capture. This paper reviews the production process, the mineralogical and morphological properties, stabilization techniques, and the applications of ladle furnace (LF) slag. One of the prime focuses of waste remediation and sustainable industry is to find meaningful ways to turn waste into products. In this respect, a comprehensive review of the properties of LF slag and its current application will help provide a framework for the development of future sustainability goals. With increased slag usage, the ladle refining process of steelmaking can be turned into a more carbon‐neutral process.

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Section: Lf Slag Productionmentioning

confidence: 99%

Ladle Furnace Slag: Synthesis, Properties, and Applications

Jacob

2023

ChemBioEng Reviews

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“…In contrast, periclase is a noteworthy compound due to its expansive influence in the matrix behavior. Identified in all cementitious pastes including the reference one, it is due to the presence of magnesium in the slag composition and in the natural occurrence of this compound in the limestone rocks used for the manufacture of cement [17]. Sample A3, which presented better performance in compressive strength analysis, also presents lower periclase peaks than the others.…”

Section: Xrd Analysismentioning

confidence: 99%

“…Another worrying compound is ettringite, with expansive properties that can lead to cracks and destabilize the cement matrix [17,20,34]. Diffracted in all pastes with LFS, this compound is formed both by the aluminates present in the cement composition (C2A and C3A) and by the aluminum present in the chemical analyzes of the samples (Table 2).…”

Section: Xrd Analysismentioning

confidence: 99%

“…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%

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

et al. 2022

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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.

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“…This expansivity problem can be more pronounced, as the high temperatures reached in ladle furnaces may cause the magnesium oxide in LFS to be hardburned; consequently, it exhibits low reactivity and can undergo this expansive reaction long after being mixed with water [43,44]. Thus, LFS has traditionally been regarded as a waste material, and it is typically deposited in landfills after its stabilization through aging and water sprinkling [40,45].…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Relationship between Compressive Strength and Modulus of Elasticity in Concrete with Ladle Furnace Slag

Revilla-Cuesta,

Serrano-López,

Espinosa

et al. 2023

Buildings

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The addition of Ladle Furnace Slag (LFS) to concrete modifies its compressive strength and modulus of elasticity and consequently impacts their relationship. This research evaluated both properties at 28, 90, and 180 days in concrete mixes produced with 5%, 10%, and 20% of two LFS types, both stabilized and non-stabilized. The relationship between them was then analyzed through these experimental results by adopting a statistical approach. A three-way analysis of variance revealed that both properties were affected by LFS differently. Thus, the effect of each LFS content on both features varied depending on its composition and pre-treatment. Furthermore, the effect of the LFS content on the compressive strength was also influenced by the age of the concrete. These facets implied that when analyzing the relationship between both mechanical properties, the monotonic correlations were stronger than the linear ones, reaching values between 0.90 and 1.00. Therefore, the double reciprocal regression models were the most precise ones for expressing the modulus of elasticity as a function of compressive strength. The model accuracy was further enhanced when discriminating based on the LFS type and introducing concrete age as a predictive variable. With all these considerations, the average deviations between the estimated and experimental values of 1–3% and the maximum deviations of 4–7% were reached, as well as R2 coefficients of up to 97%. These aspects are central to the further development of LFS concrete models.

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Use of ladle furnace slag as supplementary cementitious material before and after modification by rapid air cooling: A comparative study of influence on the properties of blended cement paste

Cited by 24 publications

References 54 publications

Ladle Furnace Slag: Synthesis, Properties, and Applications

Ladle Furnace Slag: Synthesis, Properties, and Applications

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

Analyzing the Relationship between Compressive Strength and Modulus of Elasticity in Concrete with Ladle Furnace Slag

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