Hydration reactivity of calcium-aluminate-based ladle furnace slag powder according to various cooling conditions

Choi, Sunmi; Kim, Jin-Man

doi:10.1016/j.cemconcomp.2020.103734

Cited by 12 publications

(13 citation statements)

References 14 publications

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“…Considering the similarity of this physical property between the two and the effect it exerts on the cement binding potential, it is directed to the comparison of the values of the three samples of LFS with the literature. An interval was found close to that found in this study (2.75 to 3.6 g/cm 3 ) [10,20,23], confirming that the use of this slag as a secondary binder is feasible.…”

Section: Physical Analysissupporting

confidence: 87%

“…In contrast, fast cooling (with water), provides greater trapping of water or air in the LFS particles, which consequences are greater water absorption and greater specific mass [10]. This can be verified by the The slags this research has smaller grains, when compared to the results obtained by HENRÍQUEZ et al [26], whose slag sample showed a particle size between 0-2000 μm.…”

Section: Physical Analysissupporting

confidence: 68%

“…Discussions about the chemical composition of LFS samples lead to the conclusion that the method of cooling these slags directly influences their hydraulic properties. Slow cooling stands out due to supply of hydration of CaO with ambient humidity, reducing the possibility of expansive reactions when present in cementitious matrices [10].…”

Section: Chemical Analysismentioning

confidence: 99%

“…These methods are defined by the steel industry, during the stages of steel production, depending on the raw material available and technologies adopted, and can be classified as slow or fast [9]. Slow cooling occurs from the contact of the slag with moisture in the air, while rapid cooling occurs by spraying water on the material, causing a thermal shock [10,11]. In slow cooling, the chemical reactions of transformation of larnite (βC 2 S) into belite (γC 2 S) stand out.…”

Section: Introductionmentioning

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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Section: Physical Analysissupporting

confidence: 87%

Section: Physical Analysissupporting

confidence: 68%

Section: Chemical Analysismentioning

confidence: 99%