Use of slag (GBFS) generated in charcoal blast furnace as raw material in alkali-activated cement

Langaro, Eloise Aparecida; Moraes, Maryah Costa de; Buth, Islas Stein; Luz, Caroline Angulski da; Filho, José Ilo Pereira; Matoski, Adalberto

doi:10.1007/s10973-020-09632-9

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The alkaline activator for the production of alkali-activated cement was sodium hydroxide (NaOH), at a content of 5% in relation to the slag mass, as indicated by Langaro et al (2020).…”

Section: Methodsmentioning

confidence: 99%

Effect of self-healing in closing cracks from the sulfate attack in Portland, supersulfated and alkali-activated cement

Trentin,

Luz,

Medeiros-Junior

2024

Ambient. constr.

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Self-healing consists of closing cracks and recovering the watertight properties of cement-based materials and can occur by hydration of the materials of the mixture (autogenous) or by materials added to the mixture for this purpose (autonomous). This study consists of the use of stimulated self-healing as a way of mitigating sulfate attack (sodium and magnesium), with the evaluation of the influence of crystalline admixture in this process. For that, cycles of sulfate attack and self-healing (by wetting and drying cycles in water) were performed, aiming to evaluate the behavior of mortars with three types of cement: Portland, supersulfated, and alkali-activated. The results showed that self-healing was not sufficient to close cracks due to sulfate attack. This behavior was associated with the hypothesis that the high calcium content of the crystalline admixture reacted with the sulfates and formed expansive products, increasing the attack rate.

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“…The alkaline activator for the production of alkali-activated cement was sodium hydroxide (NaOH), at a content of 5% in relation to the slag mass, as indicated by Langaro et al (2020).…”

Section: Methodsmentioning

confidence: 99%

Effect of self-healing in closing cracks from the sulfate attack in Portland, supersulfated and alkali-activated cement

Trentin,

Luz,

Medeiros-Junior

2024

Ambient. constr.

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“…However, this peak occurred at different times, in CPII00 it was in 8 h, CPII03 in 9 h and both CPII06 and CPII10 in 10 h; that is, the greater the amount of byproduct gypsum present, the longer it took for the second peak to occur, but this did not affect the amount of heat release. In the next stages, the mortars enter the hydration stage, whose reactivity is low, but there is a gain in resistance [37].…”

Section: Flexural Mechanical Strengthmentioning

confidence: 99%

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

Ribeiro,

de Castro Xavier,

da Silva Barroso

et al. 2024

Sustainability

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The incorporation of waste into construction materials is a potential topic for study and is seen as a solution for many industries that face the following impasse: the risk to the environment due to the accumulation of waste in yards. In view of this, during the production of lactic acid, which is widely used in industries, gypsum is produced as a byproduct, yielding one ton for each ton of lactic acid. Aiming at a functional destination for this byproduct, this study proposes its addition in mortars for covering walls and ceilings. The research proposal was a mortar in a 1:6 ratio (cement:sand) with the addition of 0, 3, 6 and 10% of industrial plaster byproduct. The cement used to prepare the mortar was CPII-E32. To characterize the raw materials, scanning electron microscopy, X-ray fluorescence and X-ray diffraction analysis were carried out. To evaluate the properties in the fresh state, a consistency index and mass density and entrained air tests were carried out. In the hardened state, mass density, axial compression strength, flexural tensile strength and water absorption via capillarity were evaluated after 28 days of age. Microstructural characterization techniques were also carried out on the reference mixtures and with 3% addition of the byproduct gypsum, such as scanning electron microscopy and X-ray diffraction. The results showed that the byproduct is hemihydrate and its addition improved the workability of the mortar. Mortars with the addition of byproduct gypsum showed a reduction in mechanical resistance. The most satisfactory results were for the mixes with a 3% addition, indicating greater resistance to axial compression and flexural traction, with 3.90 MPa and 1.14 MPa, respectively.

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Influence of ground granulated blast furnace slag on the early hydration and microstructure of alkali-activated converter steel slag binder

Zhou

Sun

Liao

2020

J Therm Anal Calorim

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Use of slag (GBFS) generated in charcoal blast furnace as raw material in alkali-activated cement

Cited by 8 publications

References 20 publications

Effect of self-healing in closing cracks from the sulfate attack in Portland, supersulfated and alkali-activated cement

Effect of self-healing in closing cracks from the sulfate attack in Portland, supersulfated and alkali-activated cement

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

Influence of ground granulated blast furnace slag on the early hydration and microstructure of alkali-activated converter steel slag binder

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