Influence of the Thermal History of Granulated Blast Furnace Slags on Their Latent Hydraulic Reactivity in Cementitious Systems

Ehrenberg, Andreas; Sarcos, Natalja Romero; Hart, Daniel C.; Bornhöft, Hansjörg; Deubener, Joachim

doi:10.1007/s40831-020-00269-4

Cited by 19 publications

(9 citation statements)

References 3 publications

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“…This interpretation is in alignment with the leaching behavior of the amorphous and crystalline slags reported by Potysz and Kierczak 2019 [30]. The higher leaching values for ZFS14 samples indicate an impact of the thermal history for granulated (Fe (1−X) ,Zn X ) 2 SiO 4 , in a similar way as concluded for the granulated blast furnace slags (GBS) studied by Ehrenberg et al 2020 [29]. The conclusion reached in their study was that the use of a higher granulation temperature for a granulated blast furnace slag results in increased reactivity regarding heat of hydration, owing to the higher enthalpy of the amorphous slag.…”

Section: Effect Of Granulation Temperature On Zn Leachingsupporting

confidence: 87%

The Effect of Zn Content and Granulation Temperature on Zn Leaching in an Fe-Saturated (FeXZn(1−X))2SiO4 System

et al. 2022

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The zinc in the fayalite slag of copper smelters, in which Zn-containing raw materials are used, is mainly found to be in oxidic phases, such as glassy iron silicate. During the slag water granulation process, the molten slag is heated, whereby the granulated slag achieves varying granulation temperatures. Therefore, in this study, we aimed to characterize and assess the leaching behavior of a synthesized Fe-saturated (FeX,Zn(1−X))2SiO4 system to understand the dependance of the zinc leaching behavior on the parameters of the ZnO content (1–10 wt.%) and granulation temperature (1300 or 1400 °C). It was found that the Zn leaching increased with the increasing Zn content and granulation temperature, using both batch and static pH leaching methods. Zn leaching was further increased at pH 5 using diluted nitric acid under oxidation conditions. Among the oxides in the samples—fayalite, spinel, and glass—glass was found to contribute to Zn leaching, owing to its weathering during pH-titration.

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Section: Effect Of Granulation Temperature On Zn Leachingsupporting

confidence: 87%

The Effect of Zn Content and Granulation Temperature on Zn Leaching in an Fe-Saturated (FeXZn(1−X))2SiO4 System

et al. 2022

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“…The different reactivity of the two slags (despite the comparable oxide composition and amorphous content) could be the result of the different glassy molecular structures. The different thermal history due to variations in the operation parameters such as the molten temperature and different cooling rates of the slags can affect the glassy structures and their reactivity in cementitious systems [36,37]. For example, Ehrenberg et al [36] found that annealed slags with higher fictive temperatures exhibited an increased reactivity in blended cement compared to annealed slags with lower fictive temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…The different thermal history due to variations in the operation parameters such as the molten temperature and different cooling rates of the slags can affect the glassy structures and their reactivity in cementitious systems [36,37]. For example, Ehrenberg et al [36] found that annealed slags with higher fictive temperatures exhibited an increased reactivity in blended cement compared to annealed slags with lower fictive temperatures. The higher fictive temperature corresponds to fast-cooled samples [36,38].…”

Section: Resultsmentioning

confidence: 99%

“…For example, Ehrenberg et al [36] found that annealed slags with higher fictive temperatures exhibited an increased reactivity in blended cement compared to annealed slags with lower fictive temperatures. The higher fictive temperature corresponds to fast-cooled samples [36,38]. This indicates that the different cooling rate has a significant effect on the reactivity of slags in cementitious systems [36].…”

Section: Resultsmentioning

confidence: 99%

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Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Hamdan¹,

Kim

Hajimohammadi³

2022

RILEM Tech Lett

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The effects of chemical oxides and the surface area (SA) of slags on the initial reactivity of alkali-activated materials (AAMs) are coupled. It is well known that the reactivity of slag in AAMs is impacted by the SA, however, a quantitative measure of this effect was not provided in previous studies. For a proper understanding of the effect of slag chemistry on the reaction kinetics of AAMs, a quantitative description of the slags SA's effect is required. The reaction kinetics in the activated slags were monitored using isothermal calorimetry. The SAs of the pulverised slags were linked to the time-to-reach-the-main-peak (TTRP) of the reaction, the slope of the acceleration part of the main peak, and the total heat at one, three, and seven days. A 100% relative increase in SA caused a ~51%-75% relative decrease in TTRP. The slope of the acceleration stage also considerably increased with the SA of the slags. However, the effect of the SAs on the total heat was only distinct up to three days and then considerably reduced at seven days. The result of this study indicates that the effect of SA on the initial reactivity of AAMs cannot be simply considered using the proportional contribution. The outcome of this study can provide a promising measure to decouple the effects of SAs and the chemical compositions of slags on the reaction kinetics of AAMs by providing quantitative results for the effect SAs.

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“…In 2017, the global production of molten iron in blast furnaces was about 1.18 billion tons. Assuming that the ratio of blast-furnace slag to molten iron is 320 kg/t, approximately 380 million tons of blast-furnace slag is produced annually [44].…”

Section: Production Of Clsms From Metallurgical Waste Scmsmentioning

confidence: 99%

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

Liu

et al. 2022

Materials

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Increasing global cement and steel consumption means that a significant amount of greenhouse gases and metallurgical wastes are discharged every year. Using metallurgical waste as supplementary cementitious materials (SCMs) shows promise as a strategy for reducing greenhouse gas emissions by reducing cement production. This strategy also contributes to the utilization and management of waste resources. Controlled low-strength materials (CLSMs) are a type of backfill material consisting of industrial by-products that do not meet specification requirements. The preparation of CLSMs using metallurgical waste slag as the auxiliary cementing material instead of cement itself is a key feature of the sustainable development of the construction industry. Therefore, this paper reviews the recent research progress on the use of metallurgical waste residues (including blast furnace slag, steel slag, red mud, and copper slag) as SCMs to partially replace cement, as well as the use of alkali-activated metallurgical waste residues as cementitious materials to completely replace cement for the production of CLSMs. The general background information, mechanical features, and properties of pozzolanic metallurgical slag are introduced, and the relationship and mechanism of metallurgical slag on the performance and mechanical properties of CLSMs are analyzed. The analysis and observations in this article offer a new resource for SCM development, describe a basis for using metallurgical waste slag as a cementitious material for CLSM preparation, and offer a strategy for reducing the environmental problems associated with the treatment of metallurgical waste.

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Influence of the Thermal History of Granulated Blast Furnace Slags on Their Latent Hydraulic Reactivity in Cementitious Systems

Cited by 19 publications

References 3 publications

The Effect of Zn Content and Granulation Temperature on Zn Leaching in an Fe-Saturated (FeXZn(1−X))2SiO4 System

The Effect of Zn Content and Granulation Temperature on Zn Leaching in an Fe-Saturated (FeXZn(1−X))2SiO4 System

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

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