Cupola Furnace Slag: Its Origin, Properties and Utilization

Pribulová, Alena; Baricová, Dana; Futáš, Peter; Pokusová, Marcela; Eperješi, Š.

doi:10.1007/s40962-019-00314-3

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…It is frequently estimated that blast furnace slag availability will not increase in the western world in the next years. However, other metallurgical slags with a composition similar to blast furnace slag may be used where locally available 6 or their synthetic analog may be efficiently produced from the widely available white ladle steel slag which is mostly landfilled today 7 . In AAS, the cement clinker is totally substituted by a solid amorphous aluminosilicate (precursor), activated by an alkaline solution (two‐part system) or by a dry alkaline powder or a salt with alkaline hydrolysis (one‐part system) 8–10 .…”

Section: Introductionmentioning

confidence: 99%

Structure–function relationship during the early and long‐term hydration of one‐part alkali‐activated slag

et al. 2023

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Understanding the mechanisms controlling the early (fresh) and long-term (hardened) hydration of one-part alkali-activated slags (AAS) is key to extend their use as low CO 2 substitutes for ordinary Portland cement (OPC). Their "just add water" use makes them easier and less hazardous to manipulate than the more studied two-part ones. This is due to the absence of liquid alkaline activators, which are environmentally and energy demanding. In this work, numerous experimental techniques have been linked to obtain a comprehensive physico-chemical characterization of a one-part AAS activated with Na 2 CO 3 and Ca(OH) 2 powders at several water to solid ratios (w/s). Calorimetry and pH/conductivity measurements describe the functioning of the activators immediately after contact with water. Early reactivity is characterized through in situ X-ray powder diffraction (XRPD) and small amplitude oscillatory shear (SAOS) rheology, which reveal a rapid precipitation of nanometric hydration products (nano-C-A-S-H), which results in a continuous increase in the paste cohesivity until setting. Moreover, SAOS shows that rejuvenating the paste by means of shearing (performed externally to the rheometer in this study) is enough to restore the initial cohesion (i.e., workability) for long time spans until setting occurs. The long-term hydration is characterized by ex situ XRPD on aged AAS pastes, in parallel with mechanical testing on AAS mortar. A correlation can be observed between the amount of nano-C-A-S-H and the increase in compressive strength. Overall, this formulation shows satisfactory fresh and solid properties, demonstrating suitability for low-and normal-strength applications.

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Section: Introductionmentioning

confidence: 99%

Structure–function relationship during the early and long‐term hydration of one‐part alkali‐activated slag

et al. 2023

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“…The slag develops as a molten liquid melt and is a composite solution of silicates and oxides that solidifies upon cooling. its amount is 40-80 kg per 1 ton of cast iron produced, and is one of the reasons why this material is not as preferred as blast-furnace slag" A. Pribulova et al [2]. A practical method for minimising the usage of aggregates and making concrete production environmentally and economically efficient is to partially replace them with solid waste products or industrial by-products.…”

Section: Introductionmentioning

confidence: 99%

Recycling Cupola Slag in Concrete as Partial Replacement of Fine Aggregate for Sustainable Construction

Bhat¹

2022

IJRASET

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In the current study an effort has been made to investigate the impact of cupola slag inclusion, on the mechanical and durability properties of concrete. Different percentages (10%, 20%, 30%, 50%, and 80%) of cupola slag were used to substitute fine aggregate and corresponding results have been observed. Also, different mechanical and durability tests were carried out to check the suitability of replacing natural fine aggregate by cupola slag. Compressive strength was found to be increased by cupola slag inclusion up to a percentage replacement of fine aggregates of 30%, after which further cupola slag addition resulted in a loss of strength. For flexural and tensile strength similar trends were observed. On the other hand, as the amount of cupola inclusion increased from 0% to 80%, a decreasing trend in both water penetration depth and water absorption was observed. Likewise, for all the aforementioned criteria a notable improvement in chloride penetration was observed due to the inclusion of cupola slag. The study basically focuses on present concern regarding industrial waste which poses a risk to the environment. Industrial waste has been utilized in a sustainable manner, as it has shown improvement in properties as compared to ordinary concrete mix. Such type of modified concrete can be employed in harsh exposure conditions as can be found from durability tests. The findings of this study show that cupola slag is a sustainable matter that works well as a partial replacement for natural sand.

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“…Alabi and Mahachi [25] concluded that the cupola slag aggregate concrete shows a satisfactory development and consistency in strength as compared to NAC. Pribulova et al [26] concluded that the use of cupola slag aggregates was possible to manufacture high density concrete while the use of the cupola granulated slag as the replacement of granulated blast-furnace slag in the production of cement-free concrete has not proved to be suitable. Aderibigbe et al [27] analysed whether cupola slag was reactive, but found that it was a residue with very little pozzolanic activity and limited the percentage of Portland cement replacement (OPC) to 20%, which implied a reduction in concrete properties of 13.5%.…”

Section: Introductionmentioning

confidence: 99%

Physical-Mechanical Properties of Cupola Slag Cement Paste

et al. 2021

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The high consumption of natural resources in the industrial sector makes it necessary to implement measures that enable the reuse of the waste generated, seeking to achieve circular economy. This work assesses the viability of an alternative to the use of CEM III B 32.5 R cement in mortars for the internal coating of centrifugally spun cast iron pipes for water piping. The proposal is to reuse the slag generated in the casting process after being finely ground, as an addition mixed with CEM I 52.5 R cement, which is basically Portland clinker. In order to analyse this possibility, an extensive experimental campaign was carried out, including the analysis of the cupola slag (micro-structural and chemical composition, leachates, setting time, vitrification, puzzolanicity and resistance to sulphate) and regarding the mortars (workability and mechanical properties). The experimental programme has shown that the optimum substitution is achieved with a replacement percentage of 20% of the cement, with which similar workability, superior mechanical properties and guaranteed resistance to sulphate attack are obtained. In addition, both economic and environmental savings are achieved by not having to transport or landfill the waste. In addition, the new cement is cheaper than the cement currently used.

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Cupola Furnace Slag: Its Origin, Properties and Utilization

Cited by 14 publications

References 4 publications

Structure–function relationship during the early and long‐term hydration of one‐part alkali‐activated slag

Structure–function relationship during the early and long‐term hydration of one‐part alkali‐activated slag

Recycling Cupola Slag in Concrete as Partial Replacement of Fine Aggregate for Sustainable Construction

Physical-Mechanical Properties of Cupola Slag Cement Paste

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