Combined Use of Ladle Furnace Slag and Rice Husk Ash as a Supplementary Cementitious Material

Souza, Everton de Freitas Cordova de; Silva, Tayná Fracão da; Castro, M. L. Díaz; Ferreira, Gisleiva Cristina dos Santos

doi:10.1590/1980-5373-mr-2023-0069

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…In recent years, research has attempted to revalue LFS as a suitable raw material for the manufacturing of mortars [46][47][48][49] and, specifically, concrete [30,50,51]. Its addition, after proper stabilization, has proven that it has the ability to partially replace the fine aggregate, while preserving mechanical properties [31,52].…”

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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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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Influence of waste glass and rice husk ash on the dynamic compressive properties and variable-angle shear characteristics of concrete after high-temperature treatment: Experimental and numerical study

Su,

2024

Structures

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Long-Term Performance of Mortars with Combined Incorporation of Ladle Furnace Slag and Metakaolin

Silva,

Souza,

Mariano

et al. 2024

Buildings

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Ladle furnace slag (LFS) is used as a supplementary cementitious material (SCM) due to its high calcium oxide (CaO) content. Its binding properties are enhanced in the presence of siliceous materials, such as metakaolin (MK), forming a ternary mixture that can directly replace ordinary Portland cement (OPC). However, despite this blend having already been evaluated in alkali-activated mixtures, knowledge about this mixture in situations of direct replacement of OPC by slag is still lacking. This study evaluates the synergistic effects of combining LFS and MK in cementitious mortars. Due to an insufficient hydration reaction observed in the short term, this study focuses on assessing the long-term performance of these mortars. Both the fresh and hardened states at 28 and 180 days are evaluated, and the resulting microstructural characteristics and constituent phases are also examined. After 180 days of curing, the mortar with MK exhibits superior binding activity compared to the results at 28 days. Although the nominal resistance does not show a clear advantage with the application of MK, a significant reduction in the porosity of the mortar is observed. Microstructural analysis indicates that the addition of MK increases the hydration compounds when mixed with LFS. Importantly, the sample containing MK and LFS showed a 42% reduction in cement consumption, highlighting the potential for resource efficiency. Thus, this study contributes to promoting a circular economy between the steelmaking and civil construction sectors.

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Combined Use of Ladle Furnace Slag and Rice Husk Ash as a Supplementary Cementitious Material

Cited by 4 publications

References 27 publications

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

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

Influence of waste glass and rice husk ash on the dynamic compressive properties and variable-angle shear characteristics of concrete after high-temperature treatment: Experimental and numerical study

Long-Term Performance of Mortars with Combined Incorporation of Ladle Furnace Slag and Metakaolin

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